/**

* function: 自定义抽奖view

*/

public class PieView extends View {

private static final StringTAG = PieView.class.getSimpleName();

private String[]mStrings =new String[]{"继续加油", "保时捷911", "尴尬差点中奖",

"一辆自行车", "谢谢惠顾", "手表"};

private int mCount =mStrings.length;

// private int[] mImages = new int[]{R.drawable.iphone, R.drawable.danfan, R.drawable.f040, R.drawable.ipad, R.drawable.f015};

private int[]mImages =new int[]{R.drawable.f040, R.drawable.f040,

R.drawable.f015, R.drawable.f040, R.drawable.f015};

private int[]sectorColor =new int[]{Color.parseColor("#ffcc00"), Color.parseColor("#ffe682")};

/**

* 图片

*/

private Bitmap[]mBitmaps =new Bitmap[mStrings.length];

/**

* 画背景

*/

private PaintmBgPaint;

/**

* 绘制扇形

*/

private PaintmArcPaint;

/**

* 绘制文字

*/

private PaintmTextPaint;

/**

* 半径

*/

private int mRadius;

/**

* 圆心坐标

*/

private int mCenter;

/**

* 弧形的起始角度

*/

private int startAngle;

private int[]angles =new int[mCount];

private float mTextSize = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SHIFT, 20, getResources().getDisplayMetrics());

private RectFsectorRectF;

/**

* 弧形划过的角度

*/

private int sweepAngle;

/**

* 下标

*/

private int position;

private ObjectAnimatoranimator;

private RotateListenerlistener;

private int rotateToPosition;

public PieView(Context context) {

this(context, null);

}

public PieView(Context context, @Nullable AttributeSet attrs) {

this(context, attrs, 0);

}

public PieView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {

super(context, attrs, defStyleAttr);

init();

}

@Override

protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

int w = MeasureSpec.getSize(widthMeasureSpec);

int h = MeasureSpec.getSize(heightMeasureSpec);

int width = Math.min(w, h);

mCenter = width /2;

//半径

mRadius = (width - getPaddingLeft() *2) /2;

//设置框高都一样

setMeasuredDimension(width, width);

}

/**

* 初始化

*/

private void init() {

mBgPaint =new Paint(Paint.ANTI_ALIAS_FLAG);

mBgPaint.setColor(Color.parseColor("#FF4500"));

mArcPaint =new Paint(Paint.ANTI_ALIAS_FLAG);

mTextPaint =new Paint(Paint.ANTI_ALIAS_FLAG);

mTextPaint.setColor(Color.BLACK);

mTextPaint.setTextSize(mTextSize);

for (int i =0; i

mBitmaps[i] = BitmapFactory.decodeResource(getResources(), mImages[i %5]);

}

}

@Override

public boolean onTouchEvent(MotionEvent event) {

if (event.getAction() == MotionEvent.ACTION_DOWN) {

float x = (event.getX() -mCenter);

float y = (event.getY() -mCenter);

float touchAngle =0;

int touchRadius =0;

//判断点击的范围是否在转盘内

if (x <0 && y >0) {//第二象限

touchAngle +=180;

}else if (x <0 && y <0) {//第三象限

touchAngle +=180;

}else if (x >0 && y <0) {//第四象限

touchAngle +=360;

}

//Math.atan(y/x) 返回正数值表示相对于 x 轴的逆时针转角，返回负数值则表示顺时针转角。

// 返回值乘以 180/π，将弧度转换为角度。

touchAngle += (float) Math.toDegrees(Math.atan(y / x));

touchRadius = (int) Math.sqrt(x * x + y * y);

if (touchRadius

position = -Arrays.binarySearch(angles, (int) touchAngle) -1;

Log.d(TAG, "onTouchEvent: " +mStrings[position -1]);

}

return true;

}

return super.onTouchEvent(event);

}

@Override

protected void onDraw(Canvas canvas) {

//1.绘制背景

canvas.drawCircle(mCenter, mCenter, mCenter - getPaddingLeft() /2, mBgPaint);

//2.绘制扇形

//2.1设置每一个扇形的角度

sweepAngle =360 /mCount;

startAngle =0;

//2.2设置扇形绘制的范围

sectorRectF =new RectF(getPaddingLeft(), getPaddingLeft(),

mCenter *2 - getPaddingLeft(), mCenter *2 - getPaddingLeft());

for (int i =0; i

mArcPaint.setColor(sectorColor[i %2]);

//sectorRectF 扇形绘制范围  startAngle 弧开始绘制角度 sweepAngle 每次绘制弧的角度

// useCenter 是否连接圆心

canvas.drawArc(sectorRectF, startAngle, sweepAngle, true, mArcPaint);

//3.绘制文字

drawTexts(canvas, mStrings[i]);

//4.绘制图片

drawIcons(canvas, mBitmaps[i]);

angles[i] =startAngle;

Log.d(TAG, "onDraw: " +angles[i] +"    " + i);

startAngle +=sweepAngle;

}

super.onDraw(canvas);

}

/**

* 以二分之一的半径的长度，扇形的一半作为图片的中心点

* 图片的宽度为imageWidth

*

* @param canvas

* @param mBitmap

*/

private void drawIcons(Canvas canvas, Bitmap mBitmap) {

int imageWidth =mRadius /10;

//计算半边扇形的角度 度=Math.PI/180 弧度=180/Math.PI

float angle = (float) ((startAngle +sweepAngle /2) * Math.PI /180);

//计算中心点的坐标

int r =mRadius /2;

float x = (float) (mCenter + r * Math.cos(angle));

float y = (float) (mCenter + r * Math.sin(angle));

//设置绘制图片的范围

RectF rectF =new RectF(x - imageWidth, y - imageWidth, x + imageWidth, y + imageWidth);

canvas.drawBitmap(mBitmap, null, rectF, null);

}

/**

* 使用path添加一个路径

* 绘制文字的路径

*

* @param canvas

* @param mString

*/

private void drawTexts(Canvas canvas, String mString) {

Path path =new Path();

//添加一个圆弧的路径

path.addArc(sectorRectF, startAngle, sweepAngle);

String startText =null;

String endText =null;

//测量文字的宽度

float textWidth =mTextPaint.measureText(mString);

//水平偏移

int hOffset = (int) (mRadius *2 * Math.PI /mCount /2 - textWidth /2);

//计算弧长 处理文字过长换行

int l = (int) ((360 /mCount) * Math.PI *mRadius /180);

if (textWidth > l *4 /5) {

int index = mString.length() /2;

startText = mString.substring(0, index);

endText = mString.substring(index, mString.length());

float startTextWidth =mTextPaint.measureText(startText);

float endTextWidth =mTextPaint.measureText(endText);

//水平偏移

hOffset = (int) (mRadius *2 * Math.PI /mCount /2 - startTextWidth /2);

int endHOffset = (int) (mRadius *2 * Math.PI /mCount /2 - endTextWidth /2);

//文字高度

int h = (int) ((mTextPaint.ascent() +mTextPaint.descent()) *1.5);

//根据路径绘制文字

//hOffset 水平的偏移量 vOffset 垂直的偏移量

canvas.drawTextOnPath(startText, path, hOffset, mRadius /6, mTextPaint);

canvas.drawTextOnPath(endText, path, endHOffset, mRadius /6 - h, mTextPaint);

}else {

//根据路径绘制文字

canvas.drawTextOnPath(mString, path, hOffset, mRadius /6, mTextPaint);

}

}

public void rotate(final int i) {

rotateToPosition =360 /mCount * (mCount - i);

float toDegree =360f *5 +rotateToPosition;

animator = ObjectAnimator.ofFloat(PieView.this, "rotation", 0, toDegree);

animator.setDuration(5000);

animator.setRepeatCount(0);

animator.setInterpolator(new DecelerateInterpolator());

animator.setAutoCancel(true);

animator.start();

animator.addListener(new Animator.AnimatorListener() {

@Override

public void onAnimationStart(Animator animation) {

}

@Override

public void onAnimationEnd(Animator animation) {

//指针指向的方向为270度

if (listener !=null) {

rotateToPosition =270 -rotateToPosition;

if (rotateToPosition <0) {

rotateToPosition +=360;

}else if (rotateToPosition ==0) {

rotateToPosition =270;

}

position = -Arrays.binarySearch(angles, rotateToPosition) -1;

listener.value(mStrings[position -1]);

}

}

@Override

public void onAnimationCancel(Animator animation) {

}

@Override

public void onAnimationRepeat(Animator animation) {

}

});

}

public void setListener(RotateListener listener) {

this.listener = listener;

}

public void setValue(String v1, String v2) {

//        for (int i = 0; i < 10; i++) {

//            if(i==0||i==2||i==4||i==7){

//                mStrings[i]=v2;

//            }else {

//                mStrings[i]=v1;

//            }

//        }

}

public interface RotateListener {

void value(String s);

}