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58 lines
1.8 KiB
58 lines
1.8 KiB
import { Node, UITransform, Vec3 } from 'cc';
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/**
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* 背包字块拖拽到地图时，ui_line 从字块中心指向目标格中心。
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* 仅设置 ui_line 根节点 Content Size 的 width（配合 Mask 裁剪子节点线条图），不拉伸子图。
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*/
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export class DragPlaceLinePresenter {
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private _root: Node | null = null;
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private _defaultHeight = 9;
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bind(root: Node | null): void {
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this._root = root?.isValid ? root : null;
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if (!this._root) return;
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const ut = this._root.getComponent(UITransform);
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if (ut) {
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this._defaultHeight = ut.contentSize.height;
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}
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this.hide();
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}
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unbind(): void {
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this.hide();
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this._root = null;
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}
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/** 从起点世界坐标拉线到终点世界坐标 */
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show(fromWorld: Readonly<Vec3>, toWorld: Readonly<Vec3>): void {
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if (!this._root?.isValid) return;
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const parent = this._root.parent;
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const parentUt = parent?.getComponent(UITransform);
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if (!parentUt) return;
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const startLocal = parentUt.convertToNodeSpaceAR(new Vec3(fromWorld.x, fromWorld.y, fromWorld.z));
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const endLocal = parentUt.convertToNodeSpaceAR(new Vec3(toWorld.x, toWorld.y, toWorld.z));
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const dx = endLocal.x - startLocal.x;
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const dy = endLocal.y - startLocal.y;
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const dist = Math.sqrt(dx * dx + dy * dy);
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if (dist < 1) {
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this.hide();
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return;
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}
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const angle = Math.atan2(dy, dx) * 180 / Math.PI;
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this._root.active = true;
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this._root.setPosition(startLocal);
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this._root.angle = angle;
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const ut = this._root.getComponent(UITransform);
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ut?.setContentSize(dist, this._defaultHeight);
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}
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hide(): void {
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if (this._root?.isValid) {
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this._root.active = false;
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}
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}
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}
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