115 lines
2.3 KiB
JavaScript
115 lines
2.3 KiB
JavaScript
define(() => {
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'use strict';
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return class PatternedLine {
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constructor(pattern = null, phase = 0) {
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this.pattern = pattern;
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this.dw = pattern && pattern.partWidth;
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this.points = [];
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this.phase = phase;
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this.x = null;
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this.y = null;
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this.disconnect = false;
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}
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_link() {
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if(this.disconnect) {
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this.points.push(this.x + ' ' + this.y);
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this.disconnect = false;
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}
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}
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_nextDelta() {
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return this.pattern.getDelta(this.phase ++);
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}
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cap() {
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if(this.x !== null) {
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this.points.push(this.x + ' ' + this.y);
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this.x = null;
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this.y = null;
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this.disconnect = false;
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}
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return this;
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}
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move(x, y) {
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this.cap();
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this.x = x;
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this.y = y;
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this.disconnect = true;
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return this;
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}
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line(x, y) {
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this._link();
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if(this.pattern) {
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const len = Math.sqrt(
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(x - this.x) * (x - this.x) +
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(y - this.y) * (y - this.y)
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);
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const dx1 = (x - this.x) / len;
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const dy1 = (y - this.y) / len;
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const dx2 = -dy1;
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const dy2 = dx1;
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for(let pos = 0; pos + this.dw <= len; pos += this.dw) {
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const delta = this._nextDelta();
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this.points.push(
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(this.x + pos * dx1 + delta * dx2) + ' ' +
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(this.y + pos * dy1 + delta * dy2)
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);
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}
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} else {
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this.disconnect = true;
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}
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this.x = x;
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this.y = y;
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return this;
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}
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arc(cx, cy, theta) {
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this._link();
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const radius = Math.sqrt(
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(cx - this.x) * (cx - this.x) +
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(cy - this.y) * (cy - this.y)
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);
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const theta1 = Math.atan2(cx - this.x, cy - this.y);
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this.x = cx + Math.sin(theta1 + theta) * radius;
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this.y = cy - Math.cos(theta1 + theta) * radius;
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if(this.pattern) {
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const dir = (theta < 0 ? 1 : -1);
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const dt = this.dw / radius;
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for(let t = theta1; t + dt <= theta1 + theta; t += dt) {
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const delta = this._nextDelta() * dir;
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this.points.push(
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(cx + Math.sin(t) * (radius + delta)) + ' ' +
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(cy - Math.cos(t) * (radius + delta))
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);
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}
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} else {
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this.points.push(
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(cx + Math.sin(theta1) * radius) + ' ' +
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(cy - Math.cos(theta1) * radius) +
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'A' + radius + ' ' + radius + ' 0 ' +
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((theta < 0) ? '0 ' : '1 ') +
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'1 ' +
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this.x + ' ' + this.y
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);
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}
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return this;
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}
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asPath() {
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this._link();
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return 'M' + this.points.join('L');
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}
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};
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});
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