先看一下做出來的效果圖![在這裏插入圖片描述]
1.首先需要做一個小球圍繞中心點做一個圓周運動
如圖通過公式可以得出x和y的值,然後通過下面的方法實現小球的圓周運動
onLoad() {
this.zhuanpan.speed = 0.5; //轉盤旋轉速度
this.ball.speed = 2.5; //小球速度
this.circleCenter = new cc.Vec2(0, 0); //中心點位置座標
this.circleRadius = 250; //半徑
this.radian = 0; //弧度
this.schedule(this.circleMove, 0.01); //開始執行下面的方法,小球就會做圓周運動
}
//在update中讓轉盤自轉
update(dt) {
this.zhuanpan.rotation += this.zhuanpan.speed;
},
circleMove(dt) {
// 先計算弧度
this.radian += dt * (this.ball.speed);
let x = this.circleRadius * Math.cos(this.radian) + this.circleCenter.x;
let y = this.circleRadius * Math.sin(this.radian) + this.circleCenter.y;
let angle = 360 - 180 / Math.PI * this.radian;
//this.ball.rotation = angle;
this.ball.position = cc.v2(x, y);
},
2.然後讓小球做向心運動,即減小小球的半徑
調用下面這個方法小球就開始做向心運動了
startBallRotate(dt) {
this.circleRadius -= 15 * dt;
let ballPos = this.nodeConvertToNodeSpaceAR(this.ball, this.zhuanpan);
this.result = 5; // 這個是最後小球到達的數字位置,這個數字寫成參數,就可以控制每一輪的結果了。就可以實現手動操控結果了...
let str = ""+ this.result;
let dist = ballPos.sub(this.zhuanpan.getChildByName(str).position).mag();
if (this.circleRadius < 180 && dist < 50) {
if (this.isrotate) {
let ballPos1 = this.nodeConvertToNodeSpaceAR(this.ball, this.zhuanpan.getChildByName(str));
this.ball.setPosition(ballPos1);
}
this.ball.parent = this.zhuanpan.getChildByName(str);
this.isrotate = false;
}
if (!this.isrotate) {
this.startJumpAni(dt);
//this.moveToPos();
}
},換座標,使兩個物體處於相同座標系
nodeConvertToNodeSpaceAR(node, target) {
var worldPos = node.convertToWorldSpaceAR(cc.p(0, 0));
var pos = target.convertToNodeSpaceAR(worldPos);
return pos;
}
3.最後是小球要到達的位置
如圖,我在每個數字的位置分別創建了一些點數,讓其隨着轉盤一起運動,讓小球的位置到達這些點數的位置就可以實現了
爲了讓效果更加真實,我寫了一系列動畫模擬碰撞效果。(這裏的假動畫有點粗糙,有需要的話可以寫的詳細一點,逼真一點)
startJumpAni(dt) {
if (this.isadd) {
this.ball.x += dt * 100;
this.ball.y += dt * 50;
console.log("ball---y",this.ball.y);
if (this.ball.y > -20) {
this.ball.x -= dt * 300;
this.ball.y -= dt * 100;
this.moveToPos();
this.isadd = false;
}
}
},
moveToPos() {
let moveCenterUp = cc.moveTo(0.2,cc.p(0,48));
let moveUp1 = cc.moveTo(0.2,cc.p(-30,44));
let moveUp2 = cc.moveTo(0.2,cc.p(30,44));
let moveLeft = cc.moveTo(0.2, cc.p(-24, 0));
let moveSmall1 = cc.moveTo(0.2,cc.p(-2,4));
let moveSmall2 = cc.moveTo(0.3,cc.p(3,7));
let moveRight = cc.moveTo(0.2, cc.p(24, 0));
let moveCenter = cc.moveTo(0.3, cc.p(0, 0));
let action = cc.sequence(moveCenterUp,moveLeft,moveUp1,moveRight,moveUp2,moveSmall1,moveSmall2,moveCenter);
this.ball.runAction(action);
this.ball.position.sub(this.zhuanpan.getChildByName("number").getChildByName("0").position).mag();
},