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https://github.com/ifengzp/cocos-awesome.git
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58 lines
1.6 KiB
TypeScript
58 lines
1.6 KiB
TypeScript
const { ccclass, property } = cc._decorator;
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@ccclass
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export default class Bullet_Tracking extends cc.Component {
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@property(cc.Node)
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launch_btn: cc.Node = null;
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@property(cc.Node)
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bullet: cc.Node = null;
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@property(cc.Node)
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target: cc.Node = null;
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onLoad() {
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this.node.on(cc.Node.EventType.TOUCH_MOVE, this.touchMoveEvent, this);
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}
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touchMoveEvent(evt: cc.Event.EventTouch) {
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this.target.x += evt.getDeltaX();
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this.target.y += evt.getDeltaY();
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}
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fireFlag: boolean = false;
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fire() {
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this.bullet.getComponent(cc.Sprite).enabled = true;
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this.bullet.getChildByName('boom').active = false;
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this.bullet.setPosition(this.launch_btn.position);
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this.bullet.active = true;
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this.fireFlag = true;
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}
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hitTheTarget() {
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this.fireFlag = false;
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this.bullet.getComponent(cc.Sprite).enabled = false;
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this.bullet.getChildByName('boom').active = true;
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this.scheduleOnce(() => {
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this.bullet.getChildByName('boom').active = false;
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}, 0.2);
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}
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bulletSpeed = 200;
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update(dt) {
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if (!this.fireFlag) return;
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let targetPos: cc.Vec2 = this.target.getPosition();
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let bulletPos: cc.Vec2 = this.bullet.getPosition();
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let normalizeVec: cc.Vec2 = targetPos.subtract(bulletPos).normalize();
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this.bullet.x += normalizeVec.x * this.bulletSpeed * dt;
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this.bullet.y += normalizeVec.y * this.bulletSpeed * dt;
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// 角度变化以y轴正方向为起点，逆时针角度递增
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this.bullet.angle = cc.v2(0, 1).signAngle(normalizeVec) * 180 / Math.PI;
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let rect = this.target.getBoundingBox();
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if (rect.contains(bulletPos)) this.hitTheTarget();
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}
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}
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