282 lines
8.0 KiB
JavaScript
282 lines
8.0 KiB
JavaScript
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var Class = require('./class');
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module.exports = Class({
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initialize: function(path){
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this.reset().push(path);
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},
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/* parser */
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push: function(){
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var p = Array.prototype.join.call(arguments, ' ')
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.match(/[a-df-z]|[\-+]?(?:[\d\.]e[\-+]?|[^\s\-+,a-z])+/ig);
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if (!p) return this;
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var last, cmd = p[0], i = 1;
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while (cmd){
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switch (cmd){
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case 'm': this.move(p[i++], p[i++]); break;
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case 'l': this.line(p[i++], p[i++]); break;
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case 'c': this.curve(p[i++], p[i++], p[i++], p[i++], p[i++], p[i++]); break;
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case 's': this.curve(p[i++], p[i++], null, null, p[i++], p[i++]); break;
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case 'q': this.curve(p[i++], p[i++], p[i++], p[i++]); break;
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case 't': this.curve(p[i++], p[i++]); break;
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case 'a': this.arc(p[i+5], p[i+6], p[i], p[i+1], p[i+3], !+p[i+4], p[i+2]); i += 7; break;
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case 'h': this.line(p[i++], 0); break;
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case 'v': this.line(0, p[i++]); break;
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case 'M': this.moveTo(p[i++], p[i++]); break;
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case 'L': this.lineTo(p[i++], p[i++]); break;
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case 'C': this.curveTo(p[i++], p[i++], p[i++], p[i++], p[i++], p[i++]); break;
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case 'S': this.curveTo(p[i++], p[i++], null, null, p[i++], p[i++]); break;
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case 'Q': this.curveTo(p[i++], p[i++], p[i++], p[i++]); break;
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case 'T': this.curveTo(p[i++], p[i++]); break;
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case 'A': this.arcTo(p[i+5], p[i+6], p[i], p[i+1], p[i+3], !+p[i+4], p[i+2]); i += 7; break;
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case 'H': this.lineTo(p[i++], this.penY); break;
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case 'V': this.lineTo(this.penX, p[i++]); break;
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case 'Z': case 'z': this.close(); break;
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default: cmd = last; i--; continue;
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}
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last = cmd;
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if (last == 'm') last = 'l';
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else if (last == 'M') last = 'L';
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cmd = p[i++];
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}
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return this;
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},
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/* utility methods */
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reset: function(){
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this.penX = this.penY = 0;
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this.penDownX = this.penDownY = null;
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this._pivotX = this._pivotY = 0;
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this.onReset();
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return this;
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},
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move: function(x,y){
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this.onMove(this.penX, this.penY, this._pivotX = this.penX += (+x), this._pivotY = this.penY += (+y));
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return this;
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},
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moveTo: function(x,y){
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this.onMove(this.penX, this.penY, this._pivotX = this.penX = (+x), this._pivotY = this.penY = (+y));
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return this;
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},
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line: function(x,y){
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return this.lineTo(this.penX + (+x), this.penY + (+y));
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},
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lineTo: function(x,y){
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if (this.penDownX == null){ this.penDownX = this.penX; this.penDownY = this.penY; }
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this.onLine(this.penX, this.penY, this._pivotX = this.penX = (+x), this._pivotY = this.penY = (+y));
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return this;
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},
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curve: function(c1x, c1y, c2x, c2y, ex, ey){
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var x = this.penX, y = this.penY;
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return this.curveTo(
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x + (+c1x), y + (+c1y),
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c2x == null ? null : x + (+c2x),
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c2y == null ? null : y + (+c2y),
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ex == null ? null : x + (+ex),
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ey == null ? null : y + (+ey)
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);
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},
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curveTo: function(c1x, c1y, c2x, c2y, ex, ey){
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var x = this.penX, y = this.penY;
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if (c2x == null){
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c2x = +c1x; c2y = +c1y;
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c1x = (x * 2) - (this._pivotX || 0); c1y = (y * 2) - (this._pivotY || 0);
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}
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if (ex == null){
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this._pivotX = +c1x; this._pivotY = +c1y;
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ex = +c2x; ey = +c2y;
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c2x = (ex + (+c1x) * 2) / 3; c2y = (ey + (+c1y) * 2) / 3;
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c1x = (x + (+c1x) * 2) / 3; c1y = (y + (+c1y) * 2) / 3;
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} else {
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this._pivotX = +c2x; this._pivotY = +c2y;
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}
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if (this.penDownX == null){ this.penDownX = x; this.penDownY = y; }
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this.onBezierCurve(x, y, +c1x, +c1y, +c2x, +c2y, this.penX = +ex, this.penY = +ey);
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return this;
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},
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arc: function(x, y, rx, ry, outer, counterClockwise, rotation){
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return this.arcTo(this.penX + (+x), this.penY + (+y), rx, ry, outer, counterClockwise, rotation);
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},
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arcTo: function(x, y, rx, ry, outer, counterClockwise, rotation){
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ry = Math.abs(+ry || +rx || (+y - this.penY));
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rx = Math.abs(+rx || (+x - this.penX));
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if (!rx || !ry || (x == this.penX && y == this.penY)) return this.lineTo(x, y);
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var tX = this.penX, tY = this.penY, clockwise = !+counterClockwise, large = !!+outer;
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var rad = rotation ? rotation * Math.PI / 180 : 0, cos = Math.cos(rad), sin = Math.sin(rad);
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x -= tX; y -= tY;
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// Ellipse Center
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var cx = cos * x / 2 + sin * y / 2,
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cy = -sin * x / 2 + cos * y / 2,
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rxry = rx * rx * ry * ry,
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rycx = ry * ry * cx * cx,
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rxcy = rx * rx * cy * cy,
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a = rxry - rxcy - rycx;
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if (a < 0){
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a = Math.sqrt(1 - a / rxry);
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rx *= a; ry *= a;
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cx = x / 2; cy = y / 2;
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} else {
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a = Math.sqrt(a / (rxcy + rycx));
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if (large == clockwise) a = -a;
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var cxd = -a * cy * rx / ry,
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cyd = a * cx * ry / rx;
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cx = cos * cxd - sin * cyd + x / 2;
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cy = sin * cxd + cos * cyd + y / 2;
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}
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// Rotation + Scale Transform
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var xx = cos / rx, yx = sin / rx,
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xy = -sin / ry, yy = cos / ry;
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// Start and End Angle
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var sa = Math.atan2(xy * -cx + yy * -cy, xx * -cx + yx * -cy),
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ea = Math.atan2(xy * (x - cx) + yy * (y - cy), xx * (x - cx) + yx * (y - cy));
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cx += tX; cy += tY;
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x += tX; y += tY;
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// Circular Arc
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if (this.penDownX == null){ this.penDownX = this.penX; this.penDownY = this.penY; }
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this.onArc(
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tX, tY, this._pivotX = this.penX = x, this._pivotY = this.penY = y,
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cx, cy, rx, ry, sa, ea, !clockwise, rotation
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);
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return this;
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},
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counterArc: function(x, y, rx, ry, outer){
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return this.arc(x, y, rx, ry, outer, true);
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},
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counterArcTo: function(x, y, rx, ry, outer){
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return this.arcTo(x, y, rx, ry, outer, true);
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},
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close: function(){
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if (this.penDownX != null){
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this.onClose(this.penX, this.penY, this.penX = this.penDownX, this.penY = this.penDownY);
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this.penDownX = null;
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}
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return this;
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},
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/* overridable handlers */
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onReset: function(){
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},
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onMove: function(sx, sy, ex, ey){
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},
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onLine: function(sx, sy, ex, ey){
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this.onBezierCurve(sx, sy, sx, sy, ex, ey, ex, ey);
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},
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onBezierCurve: function(sx, sy, c1x, c1y, c2x, c2y, ex, ey){
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var gx = ex - sx, gy = ey - sy,
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g = gx * gx + gy * gy,
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v1, v2, cx, cy, u;
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cx = c1x - sx; cy = c1y - sy;
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u = cx * gx + cy * gy;
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if (u > g){
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cx -= gx;
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cy -= gy;
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} else if (u > 0 && g != 0){
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cx -= u/g * gx;
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cy -= u/g * gy;
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}
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v1 = cx * cx + cy * cy;
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cx = c2x - sx; cy = c2y - sy;
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u = cx * gx + cy * gy;
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if (u > g){
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cx -= gx;
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cy -= gy;
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} else if (u > 0 && g != 0){
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cx -= u/g * gx;
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cy -= u/g * gy;
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}
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v2 = cx * cx + cy * cy;
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if (v1 < 0.01 && v2 < 0.01){
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this.onLine(sx, sy, ex, ey);
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return;
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}
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// Avoid infinite recursion
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if (isNaN(v1) || isNaN(v2)){
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throw new Error('Bad input');
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}
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// Split curve
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var s1x = (c1x + c2x) * 0.5, s1y = (c1y + c2y) * 0.5,
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l1x = (c1x + sx) * 0.5, l1y = (c1y + sy) * 0.5,
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l2x = (l1x + s1x) * 0.5, l2y = (l1y + s1y) * 0.5,
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r2x = (ex + c2x) * 0.5, r2y = (ey + c2y) * 0.5,
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r1x = (r2x + s1x) * 0.5, r1y = (r2y + s1y) * 0.5,
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l2r1x = (l2x + r1x) * 0.5, l2r1y = (l2y + r1y) * 0.5;
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// TODO: Manual stack if necessary. Currently recursive without tail optimization.
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this.onBezierCurve(sx, sy, l1x, l1y, l2x, l2y, l2r1x, l2r1y);
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this.onBezierCurve(l2r1x, l2r1y, r1x, r1y, r2x, r2y, ex, ey);
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},
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onArc: function(sx, sy, ex, ey, cx, cy, rx, ry, sa, ea, ccw, rotation){
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// Inverse Rotation + Scale Transform
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var rad = rotation ? rotation * Math.PI / 180 : 0, cos = Math.cos(rad), sin = Math.sin(rad),
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xx = cos * rx, yx = -sin * ry,
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xy = sin * rx, yy = cos * ry;
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// Bezier Curve Approximation
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var arc = ea - sa;
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if (arc < 0 && !ccw) arc += Math.PI * 2;
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else if (arc > 0 && ccw) arc -= Math.PI * 2;
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var n = Math.ceil(Math.abs(arc / (Math.PI / 2))),
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step = arc / n,
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k = (4 / 3) * Math.tan(step / 4);
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var x = Math.cos(sa), y = Math.sin(sa);
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for (var i = 0; i < n; i++){
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var cp1x = x - k * y, cp1y = y + k * x;
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sa += step;
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x = Math.cos(sa); y = Math.sin(sa);
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var cp2x = x + k * y, cp2y = y - k * x;
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this.onBezierCurve(
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sx, sy,
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cx + xx * cp1x + yx * cp1y, cy + xy * cp1x + yy * cp1y,
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cx + xx * cp2x + yx * cp2y, cy + xy * cp2x + yy * cp2y,
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(sx = (cx + xx * x + yx * y)), (sy = (cy + xy * x + yy * y))
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);
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}
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},
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onClose: function(sx, sy, ex, ey){
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this.onLine(sx, sy, ex, ey);
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}
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});
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