67 lines
1.8 KiB
JavaScript
67 lines
1.8 KiB
JavaScript
"use strict";
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const common_vendor = require("../../common/vendor.js");
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class TransformMatrix {
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constructor() {
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this.reset();
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}
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reset() {
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this.a = 1;
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this.b = 0;
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this.c = 0;
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this.d = 1;
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this.tx = 0;
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this.ty = 0;
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this.stack = [];
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}
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translate(dx, dy) {
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this.tx += this.a * dx + this.c * dy;
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this.ty += this.b * dx + this.d * dy;
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}
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scale(sx, sy, cx = 0, cy = 0) {
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this.translate(cx, cy);
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this.a *= sx;
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this.b *= sx;
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this.c *= sy;
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this.d *= sy;
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this.translate(-cx, -cy);
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}
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toArray() {
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return [this.a, this.b, this.c, this.d, this.tx, this.ty];
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}
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// 用于调试的字符串表示
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toString() {
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return `[${this.a.toFixed(2)}, ${this.b.toFixed(2)}, ${this.c.toFixed(2)}, ${this.d.toFixed(2)}, ${this.tx.toFixed(1)}, ${this.ty.toFixed(1)}]`;
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}
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// 克隆方法
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clone() {
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const clone = new TransformMatrix();
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clone.a = this.a;
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clone.b = this.b;
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clone.c = this.c;
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clone.d = this.d;
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clone.tx = this.tx;
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clone.ty = this.ty;
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return clone;
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}
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// 添加点坐标转换方法
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transformPoint(x, y) {
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return {
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x: this.a * x + this.c * y + this.tx,
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y: this.b * x + this.d * y + this.ty
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};
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}
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// 添加逆矩阵转换方法
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invertPoint(x, y, dpr) {
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common_vendor.index.__f__("log", "at pages/index/transform-matrix.js:65", "invertPoint：", dpr);
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const det = this.a * this.d - this.b * this.c;
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if (Math.abs(det) < 1e-4)
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return { x, y };
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return {
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x: (this.d * (x / dpr - this.tx) - this.c * (y / dpr - this.ty)) / det,
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y: (this.a * (y / dpr - this.ty) - this.b * (x / dpr - this.tx)) / det
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};
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}
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}
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exports.TransformMatrix = TransformMatrix;
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//# sourceMappingURL=../../../.sourcemap/mp-weixin/pages/index/transform-matrix.js.map
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