继续常规图的绘制研究，在这绘制了个环形图(Dount Chart),很简单，大圆套小圆就出来了。呵呵，照例先上猛照:

         怎么样，效果还可以吧，实现代码很少，附上:         

package com.xcl.chart;/** * Canvas练习  *   自已画环形图(Dount Chart) *      * author:xiongchuanliang * date:2014-4-12 */import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.RectF;import android.util.DisplayMetrics;import android.view.View;public class PanelDountChart2 extends View{private int ScrWidth,ScrHeight; //演示用的百分比例,实际使用中，即为外部传入的比例参数  private final float arrPer[] = new float[]{20f,30f,10f,40f};  //RGB颜色数组private final int arrColorRgb[][] = { {77, 83, 97},                {148, 159, 181},                {253, 180, 90},              {52, 194, 188}} ;public PanelDountChart2(Context context) {super(context);// TODO Auto-generated constructor stub//屏幕信息DisplayMetrics dm = getResources().getDisplayMetrics();ScrHeight = dm.heightPixels;ScrWidth = dm.widthPixels;}public void onDraw(Canvas canvas){//画布背景canvas.drawColor(Color.WHITE);                            float cirX = ScrWidth / 2;          float cirY = ScrHeight / 3 ;          float radius = ScrHeight / 5 ;//150;                                            float arcLeft = cirX - radius;          float arcTop  = cirY - radius ;          float arcRight = cirX + radius ;          float arcBottom = cirY + radius ;          RectF arcRF0 = new RectF(arcLeft ,arcTop,arcRight,arcBottom);                   //画笔初始化Paint PaintArc = new Paint();  PaintArc.setAntiAlias(true);Paint PaintLabel = new Paint();  PaintLabel.setTextSize(22);      canvas.drawText("author:xiongchuanliang", 50, ScrHeight - 280, PaintLabel); PaintLabel.setColor(Color.WHITE);PaintLabel.setTextSize(16);                         //位置计算类          XChartCalc xcalc = new XChartCalc();        float Percentage = 0.0f; float CurrPer = 0.0f;int i= 0;          for(i=0; i