440 lines
11 KiB
JavaScript
440 lines
11 KiB
JavaScript
var Path = require("../graphic/Path");
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var PathProxy = require("../core/PathProxy");
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var transformPath = require("./transformPath");
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// command chars
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// var cc = [
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// 'm', 'M', 'l', 'L', 'v', 'V', 'h', 'H', 'z', 'Z',
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// 'c', 'C', 'q', 'Q', 't', 'T', 's', 'S', 'a', 'A'
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// ];
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var mathSqrt = Math.sqrt;
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var mathSin = Math.sin;
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var mathCos = Math.cos;
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var PI = Math.PI;
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var vMag = function (v) {
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return Math.sqrt(v[0] * v[0] + v[1] * v[1]);
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};
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var vRatio = function (u, v) {
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return (u[0] * v[0] + u[1] * v[1]) / (vMag(u) * vMag(v));
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};
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var vAngle = function (u, v) {
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return (u[0] * v[1] < u[1] * v[0] ? -1 : 1) * Math.acos(vRatio(u, v));
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};
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function processArc(x1, y1, x2, y2, fa, fs, rx, ry, psiDeg, cmd, path) {
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var psi = psiDeg * (PI / 180.0);
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var xp = mathCos(psi) * (x1 - x2) / 2.0 + mathSin(psi) * (y1 - y2) / 2.0;
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var yp = -1 * mathSin(psi) * (x1 - x2) / 2.0 + mathCos(psi) * (y1 - y2) / 2.0;
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var lambda = xp * xp / (rx * rx) + yp * yp / (ry * ry);
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if (lambda > 1) {
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rx *= mathSqrt(lambda);
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ry *= mathSqrt(lambda);
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}
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var f = (fa === fs ? -1 : 1) * mathSqrt((rx * rx * (ry * ry) - rx * rx * (yp * yp) - ry * ry * (xp * xp)) / (rx * rx * (yp * yp) + ry * ry * (xp * xp))) || 0;
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var cxp = f * rx * yp / ry;
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var cyp = f * -ry * xp / rx;
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var cx = (x1 + x2) / 2.0 + mathCos(psi) * cxp - mathSin(psi) * cyp;
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var cy = (y1 + y2) / 2.0 + mathSin(psi) * cxp + mathCos(psi) * cyp;
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var theta = vAngle([1, 0], [(xp - cxp) / rx, (yp - cyp) / ry]);
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var u = [(xp - cxp) / rx, (yp - cyp) / ry];
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var v = [(-1 * xp - cxp) / rx, (-1 * yp - cyp) / ry];
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var dTheta = vAngle(u, v);
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if (vRatio(u, v) <= -1) {
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dTheta = PI;
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}
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if (vRatio(u, v) >= 1) {
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dTheta = 0;
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}
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if (fs === 0 && dTheta > 0) {
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dTheta = dTheta - 2 * PI;
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}
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if (fs === 1 && dTheta < 0) {
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dTheta = dTheta + 2 * PI;
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}
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path.addData(cmd, cx, cy, rx, ry, theta, dTheta, psi, fs);
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}
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var commandReg = /([mlvhzcqtsa])([^mlvhzcqtsa]*)/ig; // Consider case:
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// (1) delimiter can be comma or space, where continuous commas
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// or spaces should be seen as one comma.
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// (2) value can be like:
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// '2e-4', 'l.5.9' (ignore 0), 'M-10-10', 'l-2.43e-1,34.9983',
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// 'l-.5E1,54', '121-23-44-11' (no delimiter)
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var numberReg = /-?([0-9]*\.)?[0-9]+([eE]-?[0-9]+)?/g; // var valueSplitReg = /[\s,]+/;
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function createPathProxyFromString(data) {
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if (!data) {
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return new PathProxy();
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} // var data = data.replace(/-/g, ' -')
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// .replace(/ /g, ' ')
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// .replace(/ /g, ',')
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// .replace(/,,/g, ',');
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// var n;
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// create pipes so that we can split the data
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// for (n = 0; n < cc.length; n++) {
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// cs = cs.replace(new RegExp(cc[n], 'g'), '|' + cc[n]);
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// }
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// data = data.replace(/-/g, ',-');
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// create array
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// var arr = cs.split('|');
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// init context point
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var cpx = 0;
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var cpy = 0;
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var subpathX = cpx;
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var subpathY = cpy;
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var prevCmd;
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var path = new PathProxy();
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var CMD = PathProxy.CMD; // commandReg.lastIndex = 0;
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// var cmdResult;
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// while ((cmdResult = commandReg.exec(data)) != null) {
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// var cmdStr = cmdResult[1];
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// var cmdContent = cmdResult[2];
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var cmdList = data.match(commandReg);
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for (var l = 0; l < cmdList.length; l++) {
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var cmdText = cmdList[l];
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var cmdStr = cmdText.charAt(0);
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var cmd; // String#split is faster a little bit than String#replace or RegExp#exec.
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// var p = cmdContent.split(valueSplitReg);
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// var pLen = 0;
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// for (var i = 0; i < p.length; i++) {
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// // '' and other invalid str => NaN
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// var val = parseFloat(p[i]);
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// !isNaN(val) && (p[pLen++] = val);
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// }
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var p = cmdText.match(numberReg) || [];
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var pLen = p.length;
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for (var i = 0; i < pLen; i++) {
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p[i] = parseFloat(p[i]);
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}
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var off = 0;
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while (off < pLen) {
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var ctlPtx;
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var ctlPty;
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var rx;
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var ry;
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var psi;
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var fa;
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var fs;
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var x1 = cpx;
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var y1 = cpy; // convert l, H, h, V, and v to L
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switch (cmdStr) {
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case 'l':
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cpx += p[off++];
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cpy += p[off++];
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cmd = CMD.L;
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path.addData(cmd, cpx, cpy);
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break;
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case 'L':
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cpx = p[off++];
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cpy = p[off++];
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cmd = CMD.L;
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path.addData(cmd, cpx, cpy);
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break;
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case 'm':
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cpx += p[off++];
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cpy += p[off++];
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cmd = CMD.M;
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path.addData(cmd, cpx, cpy);
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subpathX = cpx;
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subpathY = cpy;
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cmdStr = 'l';
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break;
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case 'M':
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cpx = p[off++];
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cpy = p[off++];
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cmd = CMD.M;
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path.addData(cmd, cpx, cpy);
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subpathX = cpx;
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subpathY = cpy;
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cmdStr = 'L';
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break;
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case 'h':
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cpx += p[off++];
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cmd = CMD.L;
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path.addData(cmd, cpx, cpy);
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break;
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case 'H':
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cpx = p[off++];
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cmd = CMD.L;
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path.addData(cmd, cpx, cpy);
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break;
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case 'v':
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cpy += p[off++];
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cmd = CMD.L;
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path.addData(cmd, cpx, cpy);
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break;
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case 'V':
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cpy = p[off++];
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cmd = CMD.L;
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path.addData(cmd, cpx, cpy);
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break;
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case 'C':
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cmd = CMD.C;
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path.addData(cmd, p[off++], p[off++], p[off++], p[off++], p[off++], p[off++]);
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cpx = p[off - 2];
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cpy = p[off - 1];
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break;
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case 'c':
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cmd = CMD.C;
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path.addData(cmd, p[off++] + cpx, p[off++] + cpy, p[off++] + cpx, p[off++] + cpy, p[off++] + cpx, p[off++] + cpy);
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cpx += p[off - 2];
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cpy += p[off - 1];
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break;
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case 'S':
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ctlPtx = cpx;
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ctlPty = cpy;
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var len = path.len();
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var pathData = path.data;
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if (prevCmd === CMD.C) {
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ctlPtx += cpx - pathData[len - 4];
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ctlPty += cpy - pathData[len - 3];
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}
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cmd = CMD.C;
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x1 = p[off++];
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y1 = p[off++];
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cpx = p[off++];
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cpy = p[off++];
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path.addData(cmd, ctlPtx, ctlPty, x1, y1, cpx, cpy);
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break;
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case 's':
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ctlPtx = cpx;
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ctlPty = cpy;
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var len = path.len();
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var pathData = path.data;
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if (prevCmd === CMD.C) {
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ctlPtx += cpx - pathData[len - 4];
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ctlPty += cpy - pathData[len - 3];
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}
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cmd = CMD.C;
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x1 = cpx + p[off++];
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y1 = cpy + p[off++];
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cpx += p[off++];
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cpy += p[off++];
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path.addData(cmd, ctlPtx, ctlPty, x1, y1, cpx, cpy);
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break;
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case 'Q':
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x1 = p[off++];
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y1 = p[off++];
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cpx = p[off++];
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cpy = p[off++];
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cmd = CMD.Q;
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path.addData(cmd, x1, y1, cpx, cpy);
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break;
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case 'q':
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x1 = p[off++] + cpx;
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y1 = p[off++] + cpy;
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cpx += p[off++];
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cpy += p[off++];
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cmd = CMD.Q;
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path.addData(cmd, x1, y1, cpx, cpy);
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break;
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case 'T':
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ctlPtx = cpx;
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ctlPty = cpy;
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var len = path.len();
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var pathData = path.data;
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if (prevCmd === CMD.Q) {
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ctlPtx += cpx - pathData[len - 4];
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ctlPty += cpy - pathData[len - 3];
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}
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cpx = p[off++];
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cpy = p[off++];
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cmd = CMD.Q;
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path.addData(cmd, ctlPtx, ctlPty, cpx, cpy);
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break;
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case 't':
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ctlPtx = cpx;
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ctlPty = cpy;
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var len = path.len();
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var pathData = path.data;
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if (prevCmd === CMD.Q) {
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ctlPtx += cpx - pathData[len - 4];
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ctlPty += cpy - pathData[len - 3];
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}
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cpx += p[off++];
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cpy += p[off++];
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cmd = CMD.Q;
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path.addData(cmd, ctlPtx, ctlPty, cpx, cpy);
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break;
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case 'A':
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rx = p[off++];
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ry = p[off++];
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psi = p[off++];
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fa = p[off++];
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fs = p[off++];
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x1 = cpx, y1 = cpy;
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cpx = p[off++];
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cpy = p[off++];
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cmd = CMD.A;
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processArc(x1, y1, cpx, cpy, fa, fs, rx, ry, psi, cmd, path);
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break;
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case 'a':
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rx = p[off++];
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ry = p[off++];
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psi = p[off++];
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fa = p[off++];
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fs = p[off++];
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x1 = cpx, y1 = cpy;
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cpx += p[off++];
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cpy += p[off++];
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cmd = CMD.A;
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processArc(x1, y1, cpx, cpy, fa, fs, rx, ry, psi, cmd, path);
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break;
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}
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}
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if (cmdStr === 'z' || cmdStr === 'Z') {
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cmd = CMD.Z;
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path.addData(cmd); // z may be in the middle of the path.
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cpx = subpathX;
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cpy = subpathY;
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}
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prevCmd = cmd;
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}
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path.toStatic();
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return path;
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} // TODO Optimize double memory cost problem
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function createPathOptions(str, opts) {
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var pathProxy = createPathProxyFromString(str);
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opts = opts || {};
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opts.buildPath = function (path) {
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if (path.setData) {
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path.setData(pathProxy.data); // Svg and vml renderer don't have context
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var ctx = path.getContext();
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if (ctx) {
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path.rebuildPath(ctx);
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}
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} else {
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var ctx = path;
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pathProxy.rebuildPath(ctx);
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}
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};
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opts.applyTransform = function (m) {
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transformPath(pathProxy, m);
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this.dirty(true);
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};
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return opts;
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}
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/**
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* Create a Path object from path string data
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* http://www.w3.org/TR/SVG/paths.html#PathData
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* @param {Object} opts Other options
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*/
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function createFromString(str, opts) {
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return new Path(createPathOptions(str, opts));
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}
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/**
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* Create a Path class from path string data
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* @param {string} str
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* @param {Object} opts Other options
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*/
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function extendFromString(str, opts) {
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return Path.extend(createPathOptions(str, opts));
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}
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/**
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* Merge multiple paths
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*/
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// TODO Apply transform
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// TODO stroke dash
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// TODO Optimize double memory cost problem
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function mergePath(pathEls, opts) {
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var pathList = [];
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var len = pathEls.length;
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for (var i = 0; i < len; i++) {
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var pathEl = pathEls[i];
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if (!pathEl.path) {
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pathEl.createPathProxy();
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}
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if (pathEl.__dirtyPath) {
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pathEl.buildPath(pathEl.path, pathEl.shape, true);
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}
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pathList.push(pathEl.path);
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}
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var pathBundle = new Path(opts); // Need path proxy.
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pathBundle.createPathProxy();
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pathBundle.buildPath = function (path) {
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path.appendPath(pathList); // Svg and vml renderer don't have context
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var ctx = path.getContext();
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if (ctx) {
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path.rebuildPath(ctx);
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}
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};
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return pathBundle;
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}
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exports.createFromString = createFromString;
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exports.extendFromString = extendFromString;
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exports.mergePath = mergePath; |