Android中球体碰撞代码分享-kotlin，入门版

* 可以产生形变，回弹的小球
*
* 整个view的核心：
* Scroller函数
* 1.调用scroller.public void startScroll(int startX, int startY, int dx, int dy, int duration);
* 在指定时间范围内，startX,startY,会移动dx,dy距离
*
* 2.然后调用:invalidate(); 系统内部会调用onDraw();
*
* 3.在onDraw方法内部又会调用  computeScrollOffset()函数。
* 所以，实现scroll.computeScrollOffset(); //如果还没有完全移动完成，就执行XXXXX
*
* 4.如果返回true 继续调用 invalidate();
*
* 这样就会在位移的过程中，执行你:  if(scroll.computeScrollOffset()){
* //你自己的方法
* }
*

class BallViewTwo @JvmOverloads constructor(context: Context,attrs: AttributeSet? = null
) : androidx.appcompat.widget.AppCompatImageView(context, attrs) {private var mContext: Context = context//屏幕的宽高private var displayHeight: Int = 0private var displayWidth: Int = 0private var changelength = 30 //第一次形变的大小private var mCurrentDirection = -1 //碰撞后，此时的方向private var mDuration = 450 //变形需要持续的时间/*** flag=-1 正常移动* flag=0 压缩变形* flag=1 恢复压缩形变* flag=2 往相反的方向弹* flag=3 弹回原先的位置*/private var flag = -1private var mShotOver: ShotOver? = null //回调函数private var moveToLeft = 100 //正常状态下，小球移动到x轴的位置private var moveToTop = 100 //正常状态下，小球移动到y轴的位置private val centerX = 180 //小球圆心xprivate val centerY = 180 //小球圆心yprivate val radius = 180 //半径private val bubbleWidth = radius * 2 //小球的宽private val bubbleHeight = radius * 2 //小球的高private var paint: Paint // 画笔private var scroller: Scroller // 整个view的核心private var rectF: RectF? = null //绘制椭圆private var ovalLeft = 0private var ovalTop = 0private var ovalRight = 0private var ovalBottom = 0 //椭圆的左上右下private var currY = 0private var currX = 0private var offset = 0 //发生的移动量private val shotBackDuration = 100 //回弹执行的时间private val shotBackChange = 15 //回弹需要移动的距离private var newOvalLeft = 0private var newOvalTop = 0private var newOvalRight = 0private var newOvalBottom = 0private var isShotBack = true // 是否开启回弹效果init {paint = Paint()paint.color = Color.REDscroller = Scroller(context)rectF = RectF()}override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {displayHeight = mContext.resources.displayMetrics.heightPixelsdisplayWidth = mContext.resources.displayMetrics.widthPixelsLog.i("qq", "ballview-------displayHeight=-$displayHeight displayWidth=$displayWidth")super.onMeasure(widthMeasureSpec, heightMeasureSpec)}override fun onSizeChanged(w: Int, h: Int, oldw: Int, oldh: Int) {super.onSizeChanged(w, h, oldw, oldh)}override fun onDraw(canvas: Canvas) {when (flag) {-1 -> {canvas.translate(moveToLeft.toFloat(), moveToTop.toFloat())canvas.drawCircle(centerX.toFloat(), centerY.toFloat(), radius.toFloat(), paint)Log.i("qq", "正常移动小球 小球left=$moveToLeft top=$moveToTop")}0 -> circleToOval(canvas)1 -> ovalToCircle(canvas)2 -> shotBackLeaveBounds(canvas)3 -> shotBackGotoBounds(canvas)}super.onDraw(canvas)}/*** 小球变形完再回弹,靠近边界*/private fun shotBackGotoBounds(canvas: Canvas) {if (scroller.computeScrollOffset()) {ovalLeft = scroller.currXovalTop = scroller.currYcanvas.translate(ovalLeft.toFloat(), ovalTop.toFloat())canvas.drawCircle(centerX.toFloat(), centerY.toFloat(), radius.toFloat(), paint)invalidate()Log.i("shotBack", "远离边界。。moveToLeft=$ovalLeft moveToTop=$ovalTop")} else {Log.i("shotBack", "所有效果都结束")canvas.translate(ovalLeft.toFloat(), ovalTop.toFloat())canvas.drawCircle(centerX.toFloat(), centerY.toFloat(), radius.toFloat(), paint)isShotBack = falsestartChange(shotBackChange)}}/*** 小球变形完再回弹，也就是远离边界*/private fun shotBackLeaveBounds(canvas: Canvas) {if (scroller.computeScrollOffset()) {ovalLeft = scroller.currXovalTop = scroller.currYcanvas.translate(ovalLeft.toFloat(), ovalTop.toFloat())canvas.drawCircle(centerX.toFloat(), centerY.toFloat(), radius.toFloat(), paint!!)invalidate()Log.i("shotBack", "远离边界。。moveToLeft=$ovalLeft moveToTop=$ovalTop")} else {canvas.translate(ovalLeft.toFloat(), ovalTop.toFloat())canvas.drawCircle(centerX.toFloat(), centerY.toFloat(), radius.toFloat(), paint!!)flag = 3finishShotBack()}}/*** 将椭圆恢复成圆形*/private fun ovalToCircle(canvas: Canvas) {if (scroller!!.computeScrollOffset()) {when (mCurrentDirection) {0 -> {currY = scroller!!.currYoffset = newOvalTop - currYovalLeft = newOvalLeft + offsetovalTop = currY + offsetovalRight = newOvalRight - offsetovalBottom = newOvalBottom + offset + offsetrectF!![ovalLeft.toFloat(), ovalTop.toFloat(), ovalRight.toFloat()] =ovalBottom.toFloat()canvas.drawOval(rectF!!, paint!!)Log.i("qq","将椭圆----恢复成圆形，方向向北 currY=$currY offset=$offset")Log.i("qq","将椭圆----恢复成圆形，方向向北 ovalLeft=$ovalLeft ovalTop=$ovalTop ovalRight=$ovalRight ovalBottom=$ovalBottom")}1 -> {currX = scroller!!.currXoffset = newOvalLeft - currXovalLeft = currX - offsetovalTop = newOvalTop + offsetovalRight = newOvalRight + offset - offsetovalBottom = newOvalBottom - offsetrectF!![ovalLeft.toFloat(), ovalTop.toFloat(), ovalRight.toFloat()] =ovalBottom.toFloat()canvas.drawOval(rectF!!, paint!!)}2 -> {currY = scroller!!.currYoffset = newOvalTop - currYovalLeft = newOvalLeft + offsetovalTop = currY - offsetovalRight = newOvalRight - offsetovalBottom = newOvalBottomrectF!![ovalLeft.toFloat(), ovalTop.toFloat(), ovalRight.toFloat()] =ovalBottom.toFloat()canvas.drawOval(rectF!!, paint!!)Log.i("qq","将椭圆----恢复成圆形，方向向南 currY=$currY offset=$offset")Log.i("qq","将椭圆----恢复成圆形，方向向南 ovalLeft=$ovalLeft ovalTop=$ovalTop ovalRight=$ovalRight ovalBottom=$ovalBottom")}3 -> {currX = scroller!!.currXoffset = newOvalLeft - currXovalLeft = currX + offsetovalTop = newOvalTop + offsetovalRight = newOvalRight + offset + offsetovalBottom = newOvalBottom - offsetrectF!![ovalLeft.toFloat(), ovalTop.toFloat(), ovalRight.toFloat()] =ovalBottom.toFloat()canvas.drawOval(rectF!!, paint!!)}}invalidate()} else {canvas.drawOval(rectF!!, paint!!)//如果需要回弹的话if (isShotBack) {flag = 2startShotBack()} else {flag = -1if (mShotOver != null) {mShotOver!!.bubbleShotEnd()}}}}/*** 圆挤压成椭圆*/private fun circleToOval(canvas: Canvas) {if (scroller!!.computeScrollOffset()) {when (mCurrentDirection) {0 -> {currY = scroller!!.currYoffset = currY - ovalTopnewOvalLeft = ovalLeft - offsetnewOvalTop = currY - offsetnewOvalRight = ovalRight + offsetnewOvalBottom = ovalBottom - offset - offsetrectF!![newOvalLeft.toFloat(), newOvalTop.toFloat(), newOvalRight.toFloat()] =newOvalBottom.toFloat()canvas.drawOval(rectF!!, paint!!)}1 -> {currX = scroller!!.currXoffset = currX - ovalLeftnewOvalLeft = currX + offsetnewOvalTop = ovalTop - offsetnewOvalRight = ovalRight - offset + offsetnewOvalBottom = ovalBottom + offsetrectF!![newOvalLeft.toFloat(), newOvalTop.toFloat(), newOvalRight.toFloat()] =newOvalBottom.toFloat()canvas.drawOval(rectF!!, paint!!)}2 -> {currY = scroller!!.currYoffset = currY - ovalTopnewOvalLeft = ovalLeft - offsetnewOvalTop = currY + offsetnewOvalRight = ovalRight + offsetnewOvalBottom = ovalBottomrectF!![newOvalLeft.toFloat(), newOvalTop.toFloat(), newOvalRight.toFloat()] =newOvalBottom.toFloat()canvas.drawOval(rectF!!, paint!!)Log.i("qq", "圆挤压成椭圆，方向向南 currY=$currY offset=$offset")Log.i("qq","圆挤压成椭圆，方向向南 newOvalLeft=$newOvalLeft newOvalTop=$newOvalTop newOvalRight=$newOvalRight newOvalBottom=$newOvalBottom")}3 -> {currX = scroller!!.currXoffset = currX - ovalLeftnewOvalLeft = currX - offsetnewOvalTop = ovalTop - offsetnewOvalRight = ovalRight - offset - offsetnewOvalBottom = ovalBottom + offsetrectF!![newOvalLeft.toFloat(), newOvalTop.toFloat(), newOvalRight.toFloat()] =newOvalBottom.toFloat()canvas.drawOval(rectF!!, paint!!)}}invalidate()} else {canvas.drawOval(rectF!!, paint!!)reverse()}}/*** 碰撞变形结束后，开启弹一弹效果*/fun startShotBack() {when (mCurrentDirection) {0 -> scroller!!.startScroll(ovalLeft, ovalTop, 0, shotBackChange, shotBackDuration)1 -> scroller!!.startScroll(ovalLeft, ovalTop, -shotBackChange, 0, shotBackDuration)2 -> scroller!!.startScroll(ovalLeft, ovalTop, 0, -shotBackChange, shotBackDuration)3 -> scroller!!.startScroll(ovalLeft, ovalTop, shotBackChange, 0, shotBackDuration)}invalidate()}/*** 结束 “弹的一段距离”*/fun finishShotBack() {when (mCurrentDirection) {0 -> scroller!!.startScroll(ovalLeft, ovalTop, 0, -shotBackChange, shotBackDuration)1 -> scroller!!.startScroll(ovalLeft, ovalTop, shotBackChange, 0, shotBackDuration)2 -> scroller!!.startScroll(ovalLeft, ovalTop, 0, shotBackChange, shotBackDuration)3 -> scroller!!.startScroll(ovalLeft, ovalTop, -shotBackChange, 0, shotBackDuration)}invalidate()}/*** 移动小球*/fun moveTo(l: Int, t: Int, direction: Int, duration: Int, shotBack: Boolean) {isShotBack = shotBackmDuration = durationmCurrentDirection = directionmoveToLeft = lmoveToTop = tif (t == 0) {mCurrentDirection = 0startChange(30)} else if (l == displayWidth - bubbleWidth) {mCurrentDirection = 1startChange(30)} else if (t == displayHeight - bubbleHeight) {mCurrentDirection = 2startChange(30)} else if (l == 0) {mCurrentDirection = 3startChange(30)} else {invalidate()}}/*** 开始变形*/private fun startChange(change: Int) {changelength = changeif (mShotOver != null) {mShotOver!!.bubbleShotStart(mCurrentDirection)}flag = 0
//发生变形时，先初始化椭圆刚发生变形时的位置ovalLeft = moveToLeftovalTop = moveToTopovalRight = moveToLeft + bubbleWidthovalBottom = ovalTop + bubbleHeightwhen (mCurrentDirection) {0 -> scroller!!.startScroll(moveToLeft, moveToTop, 0, changelength, mDuration)1 -> scroller!!.startScroll(moveToLeft, moveToTop, changelength, 0, mDuration)2 -> scroller!!.startScroll(moveToLeft, moveToTop, 0, changelength, mDuration)3 -> scroller!!.startScroll(moveToLeft, moveToTop, changelength, 0, mDuration)}Log.i("qq","小球开始变形，方向=$mCurrentDirection 当前小球的坐标ovalLeft=$ovalLeft ovalTop=$ovalTop ovalRight=$ovalRight ovalBottom=$ovalBottom")invalidate()}/*** 回复变形前的状态*/private fun reverse() {flag = 1when (mCurrentDirection) {0 -> scroller!!.startScroll(newOvalLeft, newOvalTop, 0, -changelength, mDuration)1 -> scroller!!.startScroll(newOvalLeft, newOvalTop, -changelength, 0, mDuration)2 -> scroller!!.startScroll(newOvalLeft, newOvalTop, 0, -changelength, mDuration)3 -> scroller!!.startScroll(newOvalLeft, newOvalTop, -changelength, 0, mDuration)}invalidate()}fun setShotOver(shotOver: ShotOver?) {mShotOver = shotOver}/*** 碰撞变形效果完成*/interface ShotOver {fun bubbleShotStart(direction: Int)fun bubbleShotEnd()}/*** (辅助函数）//没有实现效果* 圆挤压成椭圆时,变形加速减少*//*public void circleToOvalAndAcceleratedReduce(Canvas canvas){if(gradient == 0){newOvalLeft = ovalLeft;newOvalTop = ovalTop;newOvalRight = ovalRight;newOvalBottom = ovalBottom;}if((offset - oldOffset) >= 10 && gradient == 0){Log.i("qq", "移动距离大于10时绘制一次");newOvalLeft = ovalLeft - offset;newOvalTop = currY - offset;newOvalRight = ovalRight + offset;newOvalBottom = ovalBottom - offset - offset;rectF.set(newOvalLeft, newOvalTop, newOvalRight, newOvalBottom);canvas.drawOval(rectF, paint);oldOffset = offset;gradient = 1;}else if((offset - oldOffset) >= 7 && gradient == 1){Log.i("qq", "移动距离大于7时绘制一次");newOvalLeft = ovalLeft - offset;newOvalTop = currY - offset;newOvalRight = ovalRight + offset;newOvalBottom = ovalBottom - offset - offset;rectF.set(newOvalLeft, newOvalTop, newOvalRight, newOvalBottom);canvas.drawOval(rectF, paint);gradient = 2;oldOffset = offset;}else if((offset - oldOffset) >= 4 && gradient == 2){Log.i("qq","移动距离大于4时绘制一次");newOvalLeft = ovalLeft - offset;newOvalTop = currY - offset;newOvalRight = ovalRight + offset;newOvalBottom = ovalBottom - offset - offset;rectF.set(newOvalLeft, newOvalTop, newOvalRight, newOvalBottom);canvas.drawOval(rectF, paint);gradient = 3;oldOffset = offset;}else if((offset - oldOffset) >= 2 && gradient == 3){Log.i("qq","移动距离大于2时绘制一次");newOvalLeft = ovalLeft - offset;newOvalTop = currY - offset;newOvalRight = ovalRight + offset;newOvalBottom = ovalBottom - offset - offset;rectF.set(newOvalLeft, newOvalTop, newOvalRight, newOvalBottom);canvas.drawOval(rectF, paint);gradient = -1;oldOffset = offset;}else{Log.i("qq", "移动绘制一次");rectF.set(newOvalLeft, newOvalTop, newOvalRight, newOvalBottom);canvas.drawOval(rectF, paint);}Log.i("qq", "圆挤压成椭圆，方向向北 currY=" + currY + " offset=" + offset);Log.i("qq", "圆挤压成椭圆，方向向北 newOvalLeft=" + newOvalLeft + " newOvalTop=" + newOvalTop + " newOvalRight=" + newOvalRight + " newOvalBottom=" + newOvalBottom);}*/
}

/*** 1.根据重力感应移动小球* 2.一般重力感应使用的重力加速，这样的话每次移动距离不是固定的* 3.此应用，将速度固定。* 4.小球碰撞到边缘时，会发生形变。（小球压缩形变）* 5.可以点击按钮添加，发生形变后回弹效果*/
class AnimationActivity : Activity(), View.OnClickListener {private var sensorManager: SensorManager? = nullprivate var sensor: Sensor? = nullprivate var init = false// 因为布局是填充父窗体的，且设置了出掉状态栏，所有求出的宽高就是屏幕的宽高。private var containerWidth = 0private var containerHeight = 0// 小球的宽高private val ballWidth = 360private val ballHeight = 360// 自定义球private lateinit var ball: BallViewTwo// 小球的起始位置private var ballX = 100fprivate var ballY = 100fprivate var currentState = -1 // 初始方向private var shotDirection = -1 // 小球发生碰撞时的那刻的方向// 初始化 东 西 南 北 四个方向private val NORTH = 0private val EAST = 1private val SOUTH = 2private val WEST = 3private var constantsSpeed = 100 // 每次斜边移动的距离private val SPEED = 10 // 比例private var canMove = true // 小球是否可以移动private val durationPiece = 150 // 执行动画的时间块private var duration = 450 // 初始速度下的执行时间private var isShotBack = false/*** -1: 小球正常移动* 0: 小球正在碰撞* 1: 小球碰撞刚结束*/private var shot = -1/** Called when the activity is first created. */override fun onCreate(savedInstanceState: Bundle?) {super.onCreate(savedInstanceState)window.setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN)setContentView(R.layout.activity_animation)// 初始化重力感应sensorManager = getSystemService(SENSOR_SERVICE) as SensorManagersensor = sensorManager!!.getDefaultSensor(Sensor.TYPE_ACCELEROMETER)}private fun init() {val container = findViewById<View>(R.id.ball_container)findViewById<View>(R.id.accelerate).setOnClickListener(this) // 加速移动findViewById<View>(R.id.reduce).setOnClickListener(this) // 减少移动findViewById<View>(R.id.normal).setOnClickListener(this) // 正常速度移动findViewById<View>(R.id.isShowBack).setOnClickListener(this) // 是否弹一弹containerWidth = container.widthcontainerHeight = container.heightball = findViewById(R.id.ball)/*** 碰撞监听*/ball.setShotOver(object : BallViewTwo.ShotOver {override fun bubbleShotStart(direction: Int) {shotDirection = directionshot = 0 // 正在压缩变形canMove = false// Log.i("shotDirection", "小球发生碰撞时的方向==" + shotDirection);}override fun bubbleShotEnd() {shot = 1 // 刚压缩变形结束}})}/*** 移动小球* @param x* @param y*/private fun moveTo(x: Float, y: Float) {ballX += xballY += yif (ballX < 0) {ballX = 0f}if (ballY < 0) {ballY = 0f}if (ballX > containerWidth - ballWidth) {ballX = (containerWidth - ballWidth).toFloat()}if (ballY > containerHeight - ballHeight) {ballY = (containerHeight - ballHeight).toFloat()}ball.moveTo(ballX.toInt(), ballY.toInt(), currentState, duration, isShotBack)}private val listener = object : SensorEventListener {override fun onAccuracyChanged(sensor: Sensor, accuracy: Int) {// TODO Auto-generated method stub}override fun onSensorChanged(event: SensorEvent) {if (!init) returncurrentState = calc(event)// 如果当前方向不等于碰撞方向 并且圆刚碰撞结束if (shotDirection != currentState && shot == 1) {canMove = true}Log.i("direction", "当前方向==$currentState canMove=$canMove")// 可以移动的话才计算移动速度，调用移动方法if (canMove) {// 如果刚碰撞结束，根据位置，将其挪动一段距离if (shot == 1) {when (shotDirection) {0 -> moveTo(0f, 20f)1 -> moveTo(-20f, 0f)2 -> moveTo(0f, -20f)3 -> moveTo(20f, 0f)}shot = -1// 直接移动小球} else {constantSpeed(event)}} else {Log.i("qq", "正在执行“弹”，所以先不移动小球")}}}/*** 计算x,y轴应该移动的值（为了使每次移动距离保持不变）* @param event*/private fun constantSpeed(event: SensorEvent) {val x = event.values[SensorManager.DATA_X] * SPEEDval y = event.values[SensorManager.DATA_Y] * SPEEDval tan = x / yval movey: Doubleval movex: Doubleif (x == 0f && y != 0f) {movex = 0.0movey = constantsSpeed.toDouble()} else if (x != 0f && y == 0f) {movex = constantsSpeed.toDouble()movey = 0.0} else if (x == 0f && y == 0f) {movex = 0.0movey = 0.0} else {val temp = constantsSpeed / (tan * tan + 1)movey = Math.sqrt(temp.toDouble()) // 开根号movex = movey * tan}moveTo((if (x < 0) -Math.abs(movex) else Math.abs(movex)).toFloat(),(if (y < 0) -Math.abs(movey) else Math.abs(movey)).toFloat())}// 注册重力感应监听private fun register() {sensorManager?.registerListener(listener, sensor, SensorManager.SENSOR_DELAY_GAME)}// 解除重力感应监听private fun unregister() {sensorManager?.unregisterListener(listener)Log.i("vv", "结束监听")}override fun onWindowFocusChanged(hasFocus: Boolean) {super.onWindowFocusChanged(hasFocus)if (hasFocus && !init) {init()init = true}}/*** 计算当前球的方向*/private fun calc(event: SensorEvent): Int {val x = event.values[0]val y = event.values[1]val tempVertical: Intval tempHorizontal: InttempHorizontal = when {x > 0 -> WESTx < 0 -> EASTelse -> -1}tempVertical = when {y > 0 -> SOUTHy < 0 -> NORTHelse -> -1}currentState = when {tempHorizontal == EAST && tempVertical == NORTH ->if (Math.abs(x) > Math.abs(y)) EAST else NORTHtempHorizontal == EAST && tempVertical == SOUTH ->if (Math.abs(x) > Math.abs(y)) EAST else SOUTHtempHorizontal == WEST && tempVertical == NORTH ->if (Math.abs(x) > Math.abs(y)) WEST else NORTHtempHorizontal == WEST && tempVertical == SOUTH ->if (Math.abs(x) > Math.abs(y)) WEST else SOUTHelse -> currentState}return currentState}override fun onDestroy() {super.onDestroy()unregister()}override fun onPause() {super.onPause()unregister()}override fun onRestart() {super.onRestart()register()}override fun onResume() {super.onResume()register()}override fun onClick(v: View) {when (v.id) {R.id.accelerate -> adjustSpeedAndDuration(5)R.id.reduce -> adjustSpeedAndDuration(-5)R.id.normal -> {constantsSpeed = 10duration = 450}R.id.isShowBack -> isShotBack = !isShotBack}}/*** 改变小球的移动速度和变形时间* 因为移动速度越快，碰撞时间越短*/private fun adjustSpeedAndDuration(change: Int) {constantsSpeed += changeduration = if (change < 0) {duration + durationPiece} else {duration - durationPiece}when {constantsSpeed <= 5 -> {constantsSpeed = 5duration = 750}constantsSpeed >= 25 -> {constantsSpeed = 25duration = 150}}}
}

 xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"xmlns:tools="http://schemas.android.com/tools"tools:context=".ui.activity.AnimationActivity"><FrameLayoutandroid:id="@+id/ball_container"android:layout_width="match_parent"android:layout_height="match_parent"><com.hjq.demo.animationdemo.BallViewTwoandroid:id="@+id/ball"android:layout_width="360dp"android:layout_height="360dp" /></FrameLayout><Buttonandroid:id="@+id/accelerate"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="加速" /><Buttonandroid:id="@+id/reduce"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_below="@id/accelerate"android:text="减速" /><Buttonandroid:id="@+id/normal"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_below="@id/reduce"android:text="正常速度" /><Buttonandroid:id="@+id/isShowBack"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_below="@id/normal"android:text="是否弹一弹" />
</RelativeLayout>

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