说点:小程序平台,玩过五子棋,玩过贪吃蛇, 你玩过FlappyBird吗?
效果图:
实现细节:
JS逻辑:
主要包括 小鸟下降逻辑、随机空隙管道逻辑、 单机屏幕事件、碰撞事件、计数逻辑
小鸟下降:
- birdDown:function(){
- ctx.clearRect(0, 0, res.windowWidth, res.windowHeight)
- bird.y += bird.factor
- ctx.drawImage(birds[Math.floor(Math.random()*2)], bird.x, bird.y, bird.px, bird.px)
- ctx.draw()
- timer1 = requestAnimationFrame(this.birdDown)
- if( bird.y>res.windowHeight){
- cancelAnimationFrame(timer1)
- }
随机空隙管道:
- pipe:function(){
- pipe.x-=pipe.factor
- bird.y += bird.factor
- if(pipe.x <-pipe.width){
- pipe.x = res.windowWidth
- gapHeightY = Math.floor(Math.random()*(res.windowHeight-200))+20
- }
- ctx.drawImage('../../images/flappybird/pipe_down.png', pipe.x, 0, pipe.width, gapHeightY)
- ctx.drawImage('../../images/flappybird/pipe_up.png', pipe.x, gapHeightY+gapHeight, pipe.width, res.windowHeight-gapHeightY-gapHeight)
- }
单机屏幕事件:
- bird.y -= bird.factor2
- // 只需改变bird的y坐标值即可
碰撞事件:
- // 这里加了一个插值数10,目的是为了更贴近碰撞
- crash:function(){
- bird.cX = bird.x+bird.px-10
- bird.cY = bird.y
- pipe.cX = pipe.x
- pipe.cY = gapHeightY
- if(bird.cX > pipe.cX & bird.cY < pipe.cY-10 ){
- if(bird.cX < pipe.cX+pipe.width){
- cancelAnimationFrame(timer1)
- this.gameOver();
- }
- }else if(bird.cX > pipe.cX & bird.cY+bird.px > pipe.cY+gapHeight+10){
- if(bird.cX < pipe.cX+pipe.width){
- cancelAnimationFrame(timer1)
- this.gameOver();
- }
- }
- },
计数逻辑:
- // 根据小鸟x坐标和管道宽度进行判断 每完成一次就加1
- if(pipe.x ==10){
- bnum+=1;
- console.log(bnum)
- this.setData({
- bird_number:bnum
- })
- }
源码地址: https://github.com/jeffer0323/We-Canvas