环形旋转图2

效果图同上一篇（功能已经正常）：

package com.example.wavedemo;import java.util.List;import android.content.Context;import android.graphics.Bitmap;import android.graphics.Bitmap.Config;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Matrix;import android.graphics.Paint;import android.graphics.Paint.Align;import android.graphics.Paint.FontMetrics;import android.graphics.Paint.Style;import android.graphics.RectF;import android.text.TextPaint;import android.util.AttributeSet;import android.util.Log;import android.view.MotionEvent;import android.widget.ImageView;/** *  * @author huozhenpeng *  */public class RotationView extends ImageView {private int width;private int height;private Paint paint;private RectF rectf;private int paintWidth = 100;private int margin;private double startAngle;// 记录开始角度private Matrix matrix;private double totalRotation;private int padding;// 设置padding或者leftpaddingprivate boolean isFirst = true;private Bitmap imageScaled;private Canvas mCanvas;private TextPaint textpaint;private int textsize = 50;private FontMetrics fontMetrics;private List<RotateBean> datas;private RotateBean rotateBean;private int currentIndex = 0;public RotationView(Context context) {this(context, null);}public RotationView(Context context, AttributeSet attrs) {this(context, attrs, 0);}public RotationView(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);init();}public void init() {this.setScaleType(ScaleType.MATRIX);paint = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.DITHER_FLAG);paint.setStrokeWidth(paintWidth);paint.setStyle(Style.STROKE);textpaint = new TextPaint(Paint.ANTI_ALIAS_FLAG | Paint.DITHER_FLAG);textpaint.setTextSize(textsize);textpaint.setTextAlign(Align.CENTER);if (matrix == null) {matrix = new Matrix();} else {matrix.reset();}setImageMatrix(matrix);}@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {super.onMeasure(heightMeasureSpec, heightMeasureSpec);}@Overrideprotected void onSizeChanged(int w, int h, int oldw, int oldh) {super.onSizeChanged(w, h, oldw, oldh);width = w;height = h;padding = getPaddingLeft();margin = padding + paintWidth / 2;rectf = new RectF(margin, margin, width - margin, height - margin);imageScaled = Bitmap.createBitmap(width, height, Config.ARGB_8888);mCanvas = new Canvas();mCanvas.setBitmap(imageScaled);if (isFirst) {if (datas != null) {int sumDegrees = 0;for (int i = 0; i < datas.size(); i++) {rotateBean = datas.get(i);paint.setColor(Color.parseColor(rotateBean.getColor()));mCanvas.drawArc(rectf, sumDegrees, rotateBean.getDegrees(),false, paint);sumDegrees += rotateBean.getDegrees();}}}isFirst = false;setImageBitmap(imageScaled);if (datas != null) {rotateWheel2(90-datas.get(0).getDegrees()/2);}totalRotation=datas.get(0).getDegrees()/2;fontMetrics = textpaint.getFontMetrics();}@Overrideprotected void onDraw(Canvas canvas) {super.onDraw(canvas);if (datas != null) {textpaint.setColor(Color.parseColor(datas.get(currentIndex).getColor()));canvas.drawText(datas.get(currentIndex).getShowData(),width / 2,height / 2 - (fontMetrics.ascent + fontMetrics.descent) / 2,textpaint);}}/** * 得到（x,y）点的象限值 *  * @return quadrant 1,2,3 or 4 */private static int getQuadrant(double x, double y) {if (x >= 0) {return y >= 0 ? 1 : 4;} else {return y >= 0 ? 2 : 3;}}/** * 得到（x,y）点的角度 */private double getAngle(double x, double y) {x = x - (width / 2d);y = height - y - (height / 2d);// （就是wheelHeight/2-y，由于变为数学中的坐标系，所以相当于取了一下反）switch (getQuadrant(x, y)) {case 1:return Math.asin(y / Math.hypot(x, y)) * 180 / Math.PI;case 2:return 180 - Math.asin(y / Math.hypot(x, y)) * 180 / Math.PI;case 3:return 180 + (-1 * Math.asin(y / Math.hypot(x, y)) * 180 / Math.PI);case 4:return 360 + Math.asin(y / Math.hypot(x, y)) * 180 / Math.PI;default:return 0;}}@Overridepublic boolean onTouchEvent(MotionEvent event) {switch (event.getAction()) {case MotionEvent.ACTION_DOWN:startAngle = getAngle(event.getX(), event.getY());break;case MotionEvent.ACTION_MOVE:double currentAngle = getAngle(event.getX(), event.getY());rotateWheel((float) (startAngle - currentAngle));startAngle = currentAngle;break;case MotionEvent.ACTION_UP:totalRotation = totalRotation % 360;if (totalRotation < 0) {totalRotation = 360 + totalRotation;}MyPoint point = null;for (int i = 0; i < datas.size(); i++) {point = datas.get(i).getPoint();if (point.getX1() < totalRotation&& totalRotation < point.getX2()) {rotateWheel((float) (point.getX3() - totalRotation));currentIndex = i;}}break;}return true;}/** * 要旋转的角度 *  * @param degrees */private void rotateWheel(float degrees) {matrix.postRotate(degrees, width / 2, height / 2);setImageMatrix(matrix);totalRotation = totalRotation + degrees;}/** * 要旋转的角度 *  * @param degrees */private void rotateWheel2(float degrees) {matrix.postRotate(degrees, width / 2, height / 2);setImageMatrix(matrix);}/** * 设置数据,寻找规律 *  * degree x1 x2 x3 *  * 0 90 0 90 45 *  * 1 60 300 360 330 *  * 2 50 250 300 225 *  * 3 160 90 250 170 *  *  * @param datas */public void setData(List<RotateBean> datas) {this.datas = datas;// 为point属性赋值for (int i = 0; i < datas.size(); i++) {MyPoint point = new MyPoint();int x1 = 0;int x2 = 0;int x3 = 0;if (i == 0) {x1 = 0;x2 = datas.get(i).getDegrees();x3 = x2 / 2;point.set(x1, x2, x3);} else {for (int j = i + 1; j < datas.size(); j++) {x1 += datas.get(j).getDegrees();}x3 = x1 + datas.get(i).getDegrees() / 2+ datas.get(0).getDegrees();x1 += datas.get(0).getDegrees();x2 = x1 + datas.get(i).getDegrees();point.set(x1, x2, x3);}datas.get(i).setPoint(point);}init();}}

package com.example.wavedemo;import java.util.ArrayList;import java.util.List;import android.app.Activity;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.Window;import android.widget.ImageView;import android.widget.TextView;import android.widget.Toast;public class MainActivity5 extends Activity {private List<RotateBean> lists;private RotationView rotationView;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);this.requestWindowFeature(Window.FEATURE_NO_TITLE);setContentView(R.layout.activity_main6);rotationView=(RotationView) this.findViewById(R.id.rotateView);lists=new ArrayList<RotateBean>();lists.add(new RotateBean("+0.75", 20,"#7eb445"));lists.add(new RotateBean("+0.35", 160,"#819d87"));lists.add(new RotateBean("+0.25", 20,"#e61a5f"));lists.add(new RotateBean("+0.25", 160,"#000000"));rotationView.setData(lists);}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {return true;}@Overridepublic boolean onOptionsItemSelected(MenuItem item) {return super.onOptionsItemSelected(item);}}

package com.example.wavedemo;import java.io.Serializable;public class RotateBean implements Serializable {/** *  */private static final long serialVersionUID = 1L;private String showData;private int degrees;private boolean isSelected;private String color;// 十六进制颜色值private MyPoint point;//只是记录两个点（并非x和y）public String getShowData() {return showData;}public void setShowData(String showData) {this.showData = showData;}public int getDegrees() {return degrees;}public void setDegrees(int degrees) {this.degrees = degrees;}public boolean isSelected() {return isSelected;}public void setSelected(boolean isSelected) {this.isSelected = isSelected;}public RotateBean(String showData, int degrees) {super();this.showData = showData;this.degrees = degrees;}public String getColor() {return color;}public void setColor(String color) {this.color = color;}public MyPoint getPoint() {return point;}public void setPoint(MyPoint point) {this.point = point;}@Overridepublic String toString() {return "RotateBean [showData=" + showData + ", degrees=" + degrees+ ", isSelected=" + isSelected + ", color=" + color+ ", point=" + point + "]";}public RotateBean(String showData, int degrees, String color) {super();this.showData = showData;this.degrees = degrees;this.color = color;}}

package com.example.wavedemo;import java.io.Serializable;public class MyPoint implements Serializable {/** *  */private static final long serialVersionUID = 1L;public MyPoint() {// TODO Auto-generated constructor stub}private int x1;private int x2;private int x3;public int getX1() {return x1;}public void setX1(int x1) {this.x1 = x1;}public int getX2() {return x2;}public void setX2(int x2) {this.x2 = x2;}public int getX3() {return x3;}public void setX3(int x3) {this.x3 = x3;}public void set(int x1, int x2, int x3) {setX1(x1);setX2(x2);setX3(x3);}@Overridepublic String toString() {return "MyPoint [x1=" + x1 + ", x2=" + x2 + ", x3=" + x3 + "]";}}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:id="@+id/rl_parent"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    android:paddingTop="20dp" >    <LinearLayout        android:layout_width="match_parent"        android:layout_height="250dp"        android:orientation="horizontal" >        <View            android:layout_width="0dp"            android:layout_height="wrap_content"            android:layout_weight="1" />        <com.example.wavedemo.RotationView            android:id="@+id/rotateView"            android:layout_width="match_parent"            android:layout_height="250dp" />        <View            android:layout_width="0dp"            android:layout_height="wrap_content"            android:layout_weight="1" />    </LinearLayout>    <TextView         android:layout_width="match_parent"        android:layout_height="wrap_content"        android:gravity="center"        android:text="|"        android:textColor="#5d3d78"        /></LinearLayout>