54 lines
2.4 KiB
TypeScript
54 lines
2.4 KiB
TypeScript
const { ccclass, property } = cc._decorator;
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/** 两张镜像彩虹沿旋转后的纵轴循环，完全离开遮罩后接到另一张后面。 */
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@ccclass
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export default class RainbowScroll extends cc.Component {
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@property(cc.Node)
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color1: cc.Node = null;
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@property(cc.Node)
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color2: cc.Node = null;
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@property({ tooltip: "彩虹向左上滚动的速度（每秒像素）", min: 0 })
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speed: number = 60;
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private colors: cc.Node[] = [];
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private direction = cc.v2(0, 0);
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private exits: number[] = [];
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private loopLength = 0;
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onLoad(): void {
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// 预制体重存后引用可能为空，按既有节点层级恢复。
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const mask = this.node.getChildByName("mask");
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this.color1 = this.color1 || mask.getChildByName("color1");
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this.color2 = this.color2 || mask.getChildByName("color2");
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this.colors = [this.color1, this.color2];
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const radians = this.color1.angle * Math.PI / 180;
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this.direction = cc.v2(-Math.sin(radians), Math.cos(radians));
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const centers = this.colors.map(node => mask.convertToNodeSpaceAR(node.convertToWorldSpaceAR(
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cc.v2((0.5 - node.anchorX) * node.width, (0.5 - node.anchorY) * node.height))));
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const offsets = centers.map((center, i) => cc.v2(center.x - this.colors[i].x, center.y - this.colors[i].y));
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const lengths = this.colors.map(node => node.height * Math.abs(node.scaleY));
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this.loopLength = lengths[0] + lengths[1];
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const left = -mask.width * mask.anchorX;
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const bottom = -mask.height * mask.anchorY;
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const maskEnd = Math.max(left * this.direction.x, (left + mask.width) * this.direction.x)
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+ Math.max(bottom * this.direction.y, (bottom + mask.height) * this.direction.y);
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this.exits = offsets.map((offset, i) => maskEnd + lengths[i] / 2
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- offset.x * this.direction.x - offset.y * this.direction.y);
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}
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update(dt: number): void {
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const distance = (this.speed * dt) % this.loopLength;
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this.colors.forEach((node, i) => {
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node.x += this.direction.x * distance;
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node.y += this.direction.y * distance;
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if (node.x * this.direction.x + node.y * this.direction.y > this.exits[i]) {
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node.x -= this.direction.x * this.loopLength;
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node.y -= this.direction.y * this.loopLength;
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}
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});
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}
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}
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