/**
* 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(PLEX_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);
}
