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node_modules/pixi.js/lib/utils/misc/Transform.js

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+'use strict';
+
+var Matrix = require('../../maths/matrix/Matrix.js');
+var ObservablePoint = require('../../maths/point/ObservablePoint.js');
+
+"use strict";
+class Transform {
+  /**
+   * @param options - Options for the transform.
+   * @param options.matrix - The matrix to use.
+   * @param options.observer - The observer to use.
+   */
+  constructor({ matrix, observer } = {}) {
+    this.dirty = true;
+    this._matrix = matrix ?? new Matrix.Matrix();
+    this.observer = observer;
+    this.position = new ObservablePoint.ObservablePoint(this, 0, 0);
+    this.scale = new ObservablePoint.ObservablePoint(this, 1, 1);
+    this.pivot = new ObservablePoint.ObservablePoint(this, 0, 0);
+    this.skew = new ObservablePoint.ObservablePoint(this, 0, 0);
+    this._rotation = 0;
+    this._cx = 1;
+    this._sx = 0;
+    this._cy = 0;
+    this._sy = 1;
+  }
+  /**
+   * This matrix is computed by combining this Transforms position, scale, rotation, skew, and pivot
+   * properties into a single matrix.
+   * @readonly
+   */
+  get matrix() {
+    const lt = this._matrix;
+    if (!this.dirty)
+      return lt;
+    lt.a = this._cx * this.scale.x;
+    lt.b = this._sx * this.scale.x;
+    lt.c = this._cy * this.scale.y;
+    lt.d = this._sy * this.scale.y;
+    lt.tx = this.position.x - (this.pivot.x * lt.a + this.pivot.y * lt.c);
+    lt.ty = this.position.y - (this.pivot.x * lt.b + this.pivot.y * lt.d);
+    this.dirty = false;
+    return lt;
+  }
+  /**
+   * Called when a value changes.
+   * @param point
+   * @internal
+   * @private
+   */
+  _onUpdate(point) {
+    this.dirty = true;
+    if (point === this.skew) {
+      this.updateSkew();
+    }
+    this.observer?._onUpdate(this);
+  }
+  /** Called when the skew or the rotation changes. */
+  updateSkew() {
+    this._cx = Math.cos(this._rotation + this.skew.y);
+    this._sx = Math.sin(this._rotation + this.skew.y);
+    this._cy = -Math.sin(this._rotation - this.skew.x);
+    this._sy = Math.cos(this._rotation - this.skew.x);
+    this.dirty = true;
+  }
+  toString() {
+    return `[pixi.js/math:Transform position=(${this.position.x}, ${this.position.y}) rotation=${this.rotation} scale=(${this.scale.x}, ${this.scale.y}) skew=(${this.skew.x}, ${this.skew.y}) ]`;
+  }
+  /**
+   * Decomposes a matrix and sets the transforms properties based on it.
+   * @param matrix - The matrix to decompose
+   */
+  setFromMatrix(matrix) {
+    matrix.decompose(this);
+    this.dirty = true;
+  }
+  /** The rotation of the object in radians. */
+  get rotation() {
+    return this._rotation;
+  }
+  set rotation(value) {
+    if (this._rotation !== value) {
+      this._rotation = value;
+      this._onUpdate(this.skew);
+    }
+  }
+}
+
+exports.Transform = Transform;
+//# sourceMappingURL=Transform.js.map