package com.xcl.chart;


/**
 * Canvas练习 
 *   自已画南丁格尔玫瑰图(Nightingale rose diagram)
 *   
 * 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.Paint.Style;
import android.graphics.RectF;
import android.util.DisplayMetrics;
import android.view.View;

public class PanelRoseChart 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[]{40f,50f,60f,35f,70f,80f,90f}; 
 //演示用标签
 private final String arrPerLabel[] = new String[]{"PostgreSQL","Sybase","DB2","国产及其它","MySQL","Ms Sql","Oracle"}; 
 //RGB颜色数组
 private final int arrColorRgb[][] = { {77, 83, 97}, 
              {148, 159, 181}, 
              {253, 180, 90},
              {52, 194, 188},
              {39, 51, 72},
              {255, 135, 195},
              {215, 124, 124}} ;
 
 
public PanelRoseChart(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.BLACK);       
     
    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();   
  Paint PaintLabel = new Paint(); 
  PaintLabel.setColor(Color.WHITE);
  PaintLabel.setTextSize(16);     
  
  PaintLabel.setAntiAlias(true);
  PaintArc.setAntiAlias(true);
    //位置计算类 
    XChartCalc xcalc = new XChartCalc(); 
  
    float Percentage = 0.0f;
   float CurrPer = 0.0f;
   float NewRaidus = 0.0f;
  int i= 0; 
  
   //将百分比转换为扇形半径长度
  Percentage = 360 / arrPer.length;
  Percentage = (float)(Math.round(Percentage *100))/100; 
  
    for(i=0; i<arrPer.length; i++)  
    { 
      //将百分比转换为新扇区的半径 
      NewRaidus = radius * (arrPer[i]/ 100); 
      NewRaidus = (float)(Math.round(NewRaidus *100))/100; 
      
      float NewarcLeft = cirX - NewRaidus; 
      float NewarcTop = cirY - NewRaidus ; 
      float NewarcRight = cirX + NewRaidus ; 
      float NewarcBottom = cirY + NewRaidus ; 
      RectF NewarcRF = new RectF(NewarcLeft ,NewarcTop,NewarcRight,NewarcBottom);  
            
      //分配颜色      
      PaintArc.setARGB(255,arrColorRgb[i][0], arrColorRgb[i][1], arrColorRgb[i][2]);
        
      //在饼图中显示所占比例 
      canvas.drawArc(NewarcRF, CurrPer, Percentage, true, PaintArc);         
      //计算百分比标签
      xcalc.CalcArcEndPointXY(cirX, cirY, radius - radius/2/2, CurrPer + Percentage/2);  
   //标识
    canvas.drawText(arrPerLabel[i],xcalc.getPosX(), xcalc.getPosY() ,PaintLabel);    
      //下次的起始角度 
      CurrPer += Percentage; 
    } 
    //外环
    PaintLabel.setStyle(Style.STROKE);
    PaintLabel.setColor(Color.GREEN);
    canvas.drawCircle(cirX,cirY,radius,PaintLabel); 

    canvas.drawText("author:xiongchuanliang", 10, ScrHeight - 200, PaintLabel);
      
 }

}