| 1 | define(["./_base","dojo/_base/lang"], |
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| 2 | function(g, lang){ |
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| 3 | var m = g.matrix = {}; |
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| 4 | |
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| 5 | // candidates for dojox.math: |
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| 6 | var _degToRadCache = {}; |
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| 7 | m._degToRad = function(degree){ |
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| 8 | return _degToRadCache[degree] || (_degToRadCache[degree] = (Math.PI * degree / 180)); |
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| 9 | }; |
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| 10 | m._radToDeg = function(radian){ return radian / Math.PI * 180; }; |
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| 11 | |
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| 12 | m.Matrix2D = function(arg){ |
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| 13 | // summary: |
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| 14 | // a 2D matrix object |
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| 15 | // description: |
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| 16 | // Normalizes a 2D matrix-like object. If arrays is passed, |
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| 17 | // all objects of the array are normalized and multiplied sequentially. |
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| 18 | // arg: Object |
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| 19 | // a 2D matrix-like object, a number, or an array of such objects |
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| 20 | if(arg){ |
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| 21 | if(typeof arg == "number"){ |
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| 22 | this.xx = this.yy = arg; |
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| 23 | }else if(arg instanceof Array){ |
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| 24 | if(arg.length > 0){ |
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| 25 | var matrix = m.normalize(arg[0]); |
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| 26 | // combine matrices |
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| 27 | for(var i = 1; i < arg.length; ++i){ |
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| 28 | var l = matrix, r = m.normalize(arg[i]); |
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| 29 | matrix = new m.Matrix2D(); |
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| 30 | matrix.xx = l.xx * r.xx + l.xy * r.yx; |
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| 31 | matrix.xy = l.xx * r.xy + l.xy * r.yy; |
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| 32 | matrix.yx = l.yx * r.xx + l.yy * r.yx; |
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| 33 | matrix.yy = l.yx * r.xy + l.yy * r.yy; |
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| 34 | matrix.dx = l.xx * r.dx + l.xy * r.dy + l.dx; |
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| 35 | matrix.dy = l.yx * r.dx + l.yy * r.dy + l.dy; |
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| 36 | } |
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| 37 | lang.mixin(this, matrix); |
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| 38 | } |
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| 39 | }else{ |
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| 40 | lang.mixin(this, arg); |
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| 41 | } |
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| 42 | } |
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| 43 | }; |
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| 44 | |
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| 45 | // the default (identity) matrix, which is used to fill in missing values |
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| 46 | lang.extend(m.Matrix2D, {xx: 1, xy: 0, yx: 0, yy: 1, dx: 0, dy: 0}); |
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| 47 | |
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| 48 | lang.mixin(m, { |
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| 49 | // summary: |
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| 50 | // class constants, and methods of dojox/gfx/matrix |
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| 51 | |
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| 52 | // matrix constants |
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| 53 | |
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| 54 | // identity: dojox/gfx/matrix.Matrix2D |
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| 55 | // an identity matrix constant: identity * (x, y) == (x, y) |
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| 56 | identity: new m.Matrix2D(), |
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| 57 | |
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| 58 | // flipX: dojox/gfx/matrix.Matrix2D |
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| 59 | // a matrix, which reflects points at x = 0 line: flipX * (x, y) == (-x, y) |
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| 60 | flipX: new m.Matrix2D({xx: -1}), |
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| 61 | |
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| 62 | // flipY: dojox/gfx/matrix.Matrix2D |
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| 63 | // a matrix, which reflects points at y = 0 line: flipY * (x, y) == (x, -y) |
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| 64 | flipY: new m.Matrix2D({yy: -1}), |
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| 65 | |
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| 66 | // flipXY: dojox/gfx/matrix.Matrix2D |
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| 67 | // a matrix, which reflects points at the origin of coordinates: flipXY * (x, y) == (-x, -y) |
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| 68 | flipXY: new m.Matrix2D({xx: -1, yy: -1}), |
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| 69 | |
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| 70 | // matrix creators |
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| 71 | |
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| 72 | translate: function(a, b){ |
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| 73 | // summary: |
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| 74 | // forms a translation matrix |
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| 75 | // description: |
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| 76 | // The resulting matrix is used to translate (move) points by specified offsets. |
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| 77 | // a: Number|dojox/gfx.Point |
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| 78 | // an x coordinate value, or a point-like object, which specifies offsets for both dimensions |
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| 79 | // b: Number? |
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| 80 | // a y coordinate value |
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| 81 | // returns: dojox/gfx/matrix.Matrix2D |
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| 82 | if(arguments.length > 1){ |
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| 83 | return new m.Matrix2D({dx: a, dy: b}); // dojox/gfx/matrix.Matrix2D |
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| 84 | } |
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| 85 | // branch |
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| 86 | return new m.Matrix2D({dx: a.x, dy: a.y}); // dojox/gfx/matrix.Matrix2D |
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| 87 | }, |
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| 88 | scale: function(a, b){ |
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| 89 | // summary: |
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| 90 | // forms a scaling matrix |
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| 91 | // description: |
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| 92 | // The resulting matrix is used to scale (magnify) points by specified offsets. |
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| 93 | // a: Number|dojox/gfx.Point |
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| 94 | // a scaling factor used for the x coordinate, or |
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| 95 | // a uniform scaling factor used for the both coordinates, or |
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| 96 | // a point-like object, which specifies scale factors for both dimensions |
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| 97 | // b: Number? |
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| 98 | // a scaling factor used for the y coordinate |
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| 99 | // returns: dojox/gfx/matrix.Matrix2D |
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| 100 | if(arguments.length > 1){ |
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| 101 | return new m.Matrix2D({xx: a, yy: b}); // dojox/gfx/matrix.Matrix2D |
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| 102 | } |
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| 103 | if(typeof a == "number"){ |
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| 104 | return new m.Matrix2D({xx: a, yy: a}); // dojox/gfx/matrix.Matrix2D |
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| 105 | } |
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| 106 | return new m.Matrix2D({xx: a.x, yy: a.y}); // dojox/gfx/matrix.Matrix2D |
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| 107 | }, |
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| 108 | rotate: function(angle){ |
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| 109 | // summary: |
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| 110 | // forms a rotating matrix |
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| 111 | // description: |
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| 112 | // The resulting matrix is used to rotate points |
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| 113 | // around the origin of coordinates (0, 0) by specified angle. |
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| 114 | // angle: Number |
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| 115 | // an angle of rotation in radians (>0 for CW) |
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| 116 | // returns: dojox/gfx/matrix.Matrix2D |
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| 117 | var c = Math.cos(angle); |
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| 118 | var s = Math.sin(angle); |
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| 119 | return new m.Matrix2D({xx: c, xy: -s, yx: s, yy: c}); // dojox/gfx/matrix.Matrix2D |
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| 120 | }, |
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| 121 | rotateg: function(degree){ |
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| 122 | // summary: |
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| 123 | // forms a rotating matrix |
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| 124 | // description: |
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| 125 | // The resulting matrix is used to rotate points |
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| 126 | // around the origin of coordinates (0, 0) by specified degree. |
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| 127 | // See dojox/gfx/matrix.rotate() for comparison. |
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| 128 | // degree: Number |
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| 129 | // an angle of rotation in degrees (>0 for CW) |
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| 130 | // returns: dojox/gfx/matrix.Matrix2D |
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| 131 | return m.rotate(m._degToRad(degree)); // dojox/gfx/matrix.Matrix2D |
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| 132 | }, |
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| 133 | skewX: function(angle) { |
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| 134 | // summary: |
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| 135 | // forms an x skewing matrix |
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| 136 | // description: |
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| 137 | // The resulting matrix is used to skew points in the x dimension |
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| 138 | // around the origin of coordinates (0, 0) by specified angle. |
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| 139 | // angle: Number |
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| 140 | // a skewing angle in radians |
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| 141 | // returns: dojox/gfx/matrix.Matrix2D |
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| 142 | return new m.Matrix2D({xy: Math.tan(angle)}); // dojox/gfx/matrix.Matrix2D |
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| 143 | }, |
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| 144 | skewXg: function(degree){ |
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| 145 | // summary: |
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| 146 | // forms an x skewing matrix |
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| 147 | // description: |
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| 148 | // The resulting matrix is used to skew points in the x dimension |
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| 149 | // around the origin of coordinates (0, 0) by specified degree. |
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| 150 | // See dojox/gfx/matrix.skewX() for comparison. |
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| 151 | // degree: Number |
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| 152 | // a skewing angle in degrees |
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| 153 | // returns: dojox/gfx/matrix.Matrix2D |
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| 154 | return m.skewX(m._degToRad(degree)); // dojox/gfx/matrix.Matrix2D |
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| 155 | }, |
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| 156 | skewY: function(angle){ |
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| 157 | // summary: |
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| 158 | // forms a y skewing matrix |
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| 159 | // description: |
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| 160 | // The resulting matrix is used to skew points in the y dimension |
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| 161 | // around the origin of coordinates (0, 0) by specified angle. |
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| 162 | // angle: Number |
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| 163 | // a skewing angle in radians |
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| 164 | // returns: dojox/gfx/matrix.Matrix2D |
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| 165 | return new m.Matrix2D({yx: Math.tan(angle)}); // dojox/gfx/matrix.Matrix2D |
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| 166 | }, |
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| 167 | skewYg: function(degree){ |
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| 168 | // summary: |
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| 169 | // forms a y skewing matrix |
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| 170 | // description: |
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| 171 | // The resulting matrix is used to skew points in the y dimension |
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| 172 | // around the origin of coordinates (0, 0) by specified degree. |
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| 173 | // See dojox/gfx/matrix.skewY() for comparison. |
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| 174 | // degree: Number |
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| 175 | // a skewing angle in degrees |
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| 176 | // returns: dojox/gfx/matrix.Matrix2D |
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| 177 | return m.skewY(m._degToRad(degree)); // dojox/gfx/matrix.Matrix2D |
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| 178 | }, |
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| 179 | reflect: function(a, b){ |
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| 180 | // summary: |
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| 181 | // forms a reflection matrix |
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| 182 | // description: |
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| 183 | // The resulting matrix is used to reflect points around a vector, |
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| 184 | // which goes through the origin. |
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| 185 | // a: dojox/gfx.Point|Number |
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| 186 | // a point-like object, which specifies a vector of reflection, or an X value |
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| 187 | // b: Number? |
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| 188 | // a Y value |
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| 189 | // returns: dojox/gfx/matrix.Matrix2D |
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| 190 | if(arguments.length == 1){ |
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| 191 | b = a.y; |
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| 192 | a = a.x; |
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| 193 | } |
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| 194 | // make a unit vector |
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| 195 | var a2 = a * a, b2 = b * b, n2 = a2 + b2, xy = 2 * a * b / n2; |
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| 196 | return new m.Matrix2D({xx: 2 * a2 / n2 - 1, xy: xy, yx: xy, yy: 2 * b2 / n2 - 1}); // dojox/gfx/matrix.Matrix2D |
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| 197 | }, |
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| 198 | project: function(a, b){ |
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| 199 | // summary: |
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| 200 | // forms an orthogonal projection matrix |
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| 201 | // description: |
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| 202 | // The resulting matrix is used to project points orthogonally on a vector, |
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| 203 | // which goes through the origin. |
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| 204 | // a: dojox/gfx.Point|Number |
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| 205 | // a point-like object, which specifies a vector of projection, or |
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| 206 | // an x coordinate value |
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| 207 | // b: Number? |
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| 208 | // a y coordinate value |
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| 209 | // returns: dojox/gfx/matrix.Matrix2D |
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| 210 | if(arguments.length == 1){ |
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| 211 | b = a.y; |
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| 212 | a = a.x; |
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| 213 | } |
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| 214 | // make a unit vector |
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| 215 | var a2 = a * a, b2 = b * b, n2 = a2 + b2, xy = a * b / n2; |
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| 216 | return new m.Matrix2D({xx: a2 / n2, xy: xy, yx: xy, yy: b2 / n2}); // dojox/gfx/matrix.Matrix2D |
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| 217 | }, |
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| 218 | |
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| 219 | // ensure matrix 2D conformance |
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| 220 | normalize: function(matrix){ |
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| 221 | // summary: |
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| 222 | // converts an object to a matrix, if necessary |
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| 223 | // description: |
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| 224 | // Converts any 2D matrix-like object or an array of |
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| 225 | // such objects to a valid dojox/gfx/matrix.Matrix2D object. |
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| 226 | // matrix: Object |
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| 227 | // an object, which is converted to a matrix, if necessary |
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| 228 | // returns: dojox/gfx/matrix.Matrix2D |
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| 229 | return (matrix instanceof m.Matrix2D) ? matrix : new m.Matrix2D(matrix); // dojox/gfx/matrix.Matrix2D |
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| 230 | }, |
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| 231 | |
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| 232 | // common operations |
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| 233 | |
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| 234 | isIdentity: function(matrix){ |
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| 235 | // summary: |
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| 236 | // returns whether the specified matrix is the identity. |
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| 237 | // matrix: dojox/gfx/matrix.Matrix2D |
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| 238 | // a 2D matrix object to be tested |
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| 239 | // returns: Boolean |
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| 240 | return matrix.xx == 1 && matrix.xy == 0 && matrix.yx == 0 && matrix.yy == 1 && matrix.dx == 0 && matrix.dy == 0; // Boolean |
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| 241 | }, |
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| 242 | clone: function(matrix){ |
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| 243 | // summary: |
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| 244 | // creates a copy of a 2D matrix |
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| 245 | // matrix: dojox/gfx/matrix.Matrix2D |
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| 246 | // a 2D matrix-like object to be cloned |
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| 247 | // returns: dojox/gfx/matrix.Matrix2D |
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| 248 | var obj = new m.Matrix2D(); |
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| 249 | for(var i in matrix){ |
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| 250 | if(typeof(matrix[i]) == "number" && typeof(obj[i]) == "number" && obj[i] != matrix[i]) obj[i] = matrix[i]; |
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| 251 | } |
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| 252 | return obj; // dojox/gfx/matrix.Matrix2D |
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| 253 | }, |
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| 254 | invert: function(matrix){ |
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| 255 | // summary: |
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| 256 | // inverts a 2D matrix |
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| 257 | // matrix: dojox/gfx/matrix.Matrix2D |
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| 258 | // a 2D matrix-like object to be inverted |
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| 259 | // returns: dojox/gfx/matrix.Matrix2D |
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| 260 | var M = m.normalize(matrix), |
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| 261 | D = M.xx * M.yy - M.xy * M.yx; |
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| 262 | M = new m.Matrix2D({ |
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| 263 | xx: M.yy/D, xy: -M.xy/D, |
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| 264 | yx: -M.yx/D, yy: M.xx/D, |
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| 265 | dx: (M.xy * M.dy - M.yy * M.dx) / D, |
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| 266 | dy: (M.yx * M.dx - M.xx * M.dy) / D |
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| 267 | }); |
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| 268 | return M; // dojox/gfx/matrix.Matrix2D |
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| 269 | }, |
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| 270 | _multiplyPoint: function(matrix, x, y){ |
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| 271 | // summary: |
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| 272 | // applies a matrix to a point |
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| 273 | // matrix: dojox/gfx/matrix.Matrix2D |
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| 274 | // a 2D matrix object to be applied |
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| 275 | // x: Number |
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| 276 | // an x coordinate of a point |
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| 277 | // y: Number |
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| 278 | // a y coordinate of a point |
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| 279 | // returns: dojox/gfx.Point |
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| 280 | return {x: matrix.xx * x + matrix.xy * y + matrix.dx, y: matrix.yx * x + matrix.yy * y + matrix.dy}; // dojox/gfx.Point |
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| 281 | }, |
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| 282 | multiplyPoint: function(matrix, /* Number||Point */ a, /* Number? */ b){ |
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| 283 | // summary: |
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| 284 | // applies a matrix to a point |
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| 285 | // matrix: dojox/gfx/matrix.Matrix2D |
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| 286 | // a 2D matrix object to be applied |
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| 287 | // a: Number|dojox/gfx.Point |
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| 288 | // an x coordinate of a point, or a point |
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| 289 | // b: Number? |
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| 290 | // a y coordinate of a point |
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| 291 | // returns: dojox/gfx.Point |
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| 292 | var M = m.normalize(matrix); |
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| 293 | if(typeof a == "number" && typeof b == "number"){ |
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| 294 | return m._multiplyPoint(M, a, b); // dojox/gfx.Point |
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| 295 | } |
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| 296 | return m._multiplyPoint(M, a.x, a.y); // dojox/gfx.Point |
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| 297 | }, |
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| 298 | multiplyRectangle: function(matrix, /*Rectangle*/ rect){ |
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| 299 | // summary: |
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| 300 | // Applies a matrix to a rectangle. |
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| 301 | // description: |
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| 302 | // The method applies the transformation on all corners of the |
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| 303 | // rectangle and returns the smallest rectangle enclosing the 4 transformed |
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| 304 | // points. |
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| 305 | // matrix: dojox/gfx/matrix.Matrix2D |
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| 306 | // a 2D matrix object to be applied. |
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| 307 | // rect: Rectangle |
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| 308 | // the rectangle to transform. |
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| 309 | // returns: dojox/gfx.Rectangle |
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| 310 | var M = m.normalize(matrix); |
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| 311 | rect = rect || {x:0, y:0, width:0, height:0}; |
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| 312 | if(m.isIdentity(M)) |
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| 313 | return {x: rect.x, y: rect.y, width: rect.width, height: rect.height}; // dojo/gfx.Rectangle |
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| 314 | var p0 = m.multiplyPoint(M, rect.x, rect.y), |
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| 315 | p1 = m.multiplyPoint(M, rect.x, rect.y + rect.height), |
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| 316 | p2 = m.multiplyPoint(M, rect.x + rect.width, rect.y), |
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| 317 | p3 = m.multiplyPoint(M, rect.x + rect.width, rect.y + rect.height), |
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| 318 | minx = Math.min(p0.x, p1.x, p2.x, p3.x), |
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| 319 | miny = Math.min(p0.y, p1.y, p2.y, p3.y), |
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| 320 | maxx = Math.max(p0.x, p1.x, p2.x, p3.x), |
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| 321 | maxy = Math.max(p0.y, p1.y, p2.y, p3.y); |
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| 322 | return{ // dojo/gfx.Rectangle |
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| 323 | x: minx, |
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| 324 | y: miny, |
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| 325 | width: maxx - minx, |
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| 326 | height: maxy - miny |
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| 327 | }; |
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| 328 | }, |
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| 329 | multiply: function(matrix){ |
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| 330 | // summary: |
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| 331 | // combines matrices by multiplying them sequentially in the given order |
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| 332 | // matrix: dojox/gfx/matrix.Matrix2D |
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| 333 | // a 2D matrix-like object, |
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| 334 | // all subsequent arguments are matrix-like objects too |
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| 335 | var M = m.normalize(matrix); |
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| 336 | // combine matrices |
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| 337 | for(var i = 1; i < arguments.length; ++i){ |
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| 338 | var l = M, r = m.normalize(arguments[i]); |
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| 339 | M = new m.Matrix2D(); |
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| 340 | M.xx = l.xx * r.xx + l.xy * r.yx; |
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| 341 | M.xy = l.xx * r.xy + l.xy * r.yy; |
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| 342 | M.yx = l.yx * r.xx + l.yy * r.yx; |
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| 343 | M.yy = l.yx * r.xy + l.yy * r.yy; |
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| 344 | M.dx = l.xx * r.dx + l.xy * r.dy + l.dx; |
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| 345 | M.dy = l.yx * r.dx + l.yy * r.dy + l.dy; |
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| 346 | } |
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| 347 | return M; // dojox/gfx/matrix.Matrix2D |
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| 348 | }, |
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| 349 | |
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| 350 | // high level operations |
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| 351 | |
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| 352 | _sandwich: function(matrix, x, y){ |
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| 353 | // summary: |
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| 354 | // applies a matrix at a central point |
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| 355 | // matrix: dojox/gfx/matrix.Matrix2D |
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| 356 | // a 2D matrix-like object, which is applied at a central point |
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| 357 | // x: Number |
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| 358 | // an x component of the central point |
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| 359 | // y: Number |
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| 360 | // a y component of the central point |
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| 361 | return m.multiply(m.translate(x, y), matrix, m.translate(-x, -y)); // dojox/gfx/matrix.Matrix2D |
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| 362 | }, |
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| 363 | scaleAt: function(a, b, c, d){ |
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| 364 | // summary: |
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| 365 | // scales a picture using a specified point as a center of scaling |
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| 366 | // description: |
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| 367 | // Compare with dojox/gfx/matrix.scale(). |
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| 368 | // a: Number |
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| 369 | // a scaling factor used for the x coordinate, or a uniform scaling factor used for both coordinates |
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| 370 | // b: Number? |
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| 371 | // a scaling factor used for the y coordinate |
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| 372 | // c: Number|Point |
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| 373 | // an x component of a central point, or a central point |
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| 374 | // d: Number |
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| 375 | // a y component of a central point |
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| 376 | // returns: dojox/gfx/matrix.Matrix2D |
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| 377 | switch(arguments.length){ |
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| 378 | case 4: |
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| 379 | // a and b are scale factor components, c and d are components of a point |
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| 380 | return m._sandwich(m.scale(a, b), c, d); // dojox/gfx/matrix.Matrix2D |
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| 381 | case 3: |
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| 382 | if(typeof c == "number"){ |
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| 383 | return m._sandwich(m.scale(a), b, c); // dojox/gfx/matrix.Matrix2D |
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| 384 | } |
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| 385 | return m._sandwich(m.scale(a, b), c.x, c.y); // dojox/gfx/matrix.Matrix2D |
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| 386 | } |
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| 387 | return m._sandwich(m.scale(a), b.x, b.y); // dojox/gfx/matrix.Matrix2D |
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| 388 | }, |
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| 389 | rotateAt: function(angle, a, b){ |
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| 390 | // summary: |
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| 391 | // rotates a picture using a specified point as a center of rotation |
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| 392 | // description: |
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| 393 | // Compare with dojox/gfx/matrix.rotate(). |
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| 394 | // angle: Number |
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| 395 | // an angle of rotation in radians (>0 for CW) |
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| 396 | // a: Number|dojox/gfx.Point |
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| 397 | // an x component of a central point, or a central point |
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| 398 | // b: Number? |
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| 399 | // a y component of a central point |
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| 400 | // returns: dojox/gfx/matrix.Matrix2D |
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| 401 | if(arguments.length > 2){ |
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| 402 | return m._sandwich(m.rotate(angle), a, b); // dojox/gfx/matrix.Matrix2D |
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| 403 | } |
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| 404 | return m._sandwich(m.rotate(angle), a.x, a.y); // dojox/gfx/matrix.Matrix2D |
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| 405 | }, |
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| 406 | rotategAt: function(degree, a, b){ |
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| 407 | // summary: |
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| 408 | // rotates a picture using a specified point as a center of rotation |
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| 409 | // description: |
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| 410 | // Compare with dojox/gfx/matrix.rotateg(). |
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| 411 | // degree: Number |
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| 412 | // an angle of rotation in degrees (>0 for CW) |
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| 413 | // a: Number|dojox/gfx.Point |
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| 414 | // an x component of a central point, or a central point |
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| 415 | // b: Number? |
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| 416 | // a y component of a central point |
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| 417 | // returns: dojox/gfx/matrix.Matrix2D |
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| 418 | if(arguments.length > 2){ |
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| 419 | return m._sandwich(m.rotateg(degree), a, b); // dojox/gfx/matrix.Matrix2D |
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| 420 | } |
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| 421 | return m._sandwich(m.rotateg(degree), a.x, a.y); // dojox/gfx/matrix.Matrix2D |
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| 422 | }, |
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| 423 | skewXAt: function(angle, a, b){ |
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| 424 | // summary: |
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| 425 | // skews a picture along the x axis using a specified point as a center of skewing |
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| 426 | // description: |
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| 427 | // Compare with dojox/gfx/matrix.skewX(). |
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| 428 | // angle: Number |
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| 429 | // a skewing angle in radians |
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| 430 | // a: Number|dojox/gfx.Point |
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| 431 | // an x component of a central point, or a central point |
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| 432 | // b: Number? |
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| 433 | // a y component of a central point |
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| 434 | // returns: dojox/gfx/matrix.Matrix2D |
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| 435 | if(arguments.length > 2){ |
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| 436 | return m._sandwich(m.skewX(angle), a, b); // dojox/gfx/matrix.Matrix2D |
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| 437 | } |
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| 438 | return m._sandwich(m.skewX(angle), a.x, a.y); // dojox/gfx/matrix.Matrix2D |
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| 439 | }, |
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| 440 | skewXgAt: function(degree, a, b){ |
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| 441 | // summary: |
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| 442 | // skews a picture along the x axis using a specified point as a center of skewing |
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| 443 | // description: |
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| 444 | // Compare with dojox/gfx/matrix.skewXg(). |
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| 445 | // degree: Number |
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| 446 | // a skewing angle in degrees |
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| 447 | // a: Number|dojox/gfx.Point |
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| 448 | // an x component of a central point, or a central point |
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| 449 | // b: Number? |
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| 450 | // a y component of a central point |
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| 451 | // returns: dojox/gfx/matrix.Matrix2D |
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| 452 | if(arguments.length > 2){ |
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| 453 | return m._sandwich(m.skewXg(degree), a, b); // dojox/gfx/matrix.Matrix2D |
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| 454 | } |
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| 455 | return m._sandwich(m.skewXg(degree), a.x, a.y); // dojox/gfx/matrix.Matrix2D |
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| 456 | }, |
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| 457 | skewYAt: function(angle, a, b){ |
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| 458 | // summary: |
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| 459 | // skews a picture along the y axis using a specified point as a center of skewing |
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| 460 | // description: |
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| 461 | // Compare with dojox/gfx/matrix.skewY(). |
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| 462 | // angle: Number |
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| 463 | // a skewing angle in radians |
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| 464 | // a: Number|dojox/gfx.Point |
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| 465 | // an x component of a central point, or a central point |
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| 466 | // b: Number? |
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| 467 | // a y component of a central point |
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| 468 | // returns: dojox/gfx/matrix.Matrix2D |
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| 469 | if(arguments.length > 2){ |
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| 470 | return m._sandwich(m.skewY(angle), a, b); // dojox/gfx/matrix.Matrix2D |
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| 471 | } |
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| 472 | return m._sandwich(m.skewY(angle), a.x, a.y); // dojox/gfx/matrix.Matrix2D |
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| 473 | }, |
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| 474 | skewYgAt: function(/* Number */ degree, /* Number||Point */ a, /* Number? */ b){ |
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| 475 | // summary: |
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| 476 | // skews a picture along the y axis using a specified point as a center of skewing |
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| 477 | // description: |
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| 478 | // Compare with dojox/gfx/matrix.skewYg(). |
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| 479 | // degree: Number |
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| 480 | // a skewing angle in degrees |
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| 481 | // a: Number|dojox/gfx.Point |
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| 482 | // an x component of a central point, or a central point |
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| 483 | // b: Number? |
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| 484 | // a y component of a central point |
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| 485 | // returns: dojox/gfx/matrix.Matrix2D |
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| 486 | if(arguments.length > 2){ |
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| 487 | return m._sandwich(m.skewYg(degree), a, b); // dojox/gfx/matrix.Matrix2D |
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| 488 | } |
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| 489 | return m._sandwich(m.skewYg(degree), a.x, a.y); // dojox/gfx/matrix.Matrix2D |
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| 490 | } |
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| 491 | |
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| 492 | //TODO: rect-to-rect mapping, scale-to-fit (isotropic and anisotropic versions) |
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| 493 | |
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| 494 | }); |
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| 495 | // propagate Matrix2D up |
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| 496 | g.Matrix2D = m.Matrix2D; |
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| 497 | |
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| 498 | return m; |
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| 499 | }); |
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| 500 | |
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| 501 | |
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