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Android中使用Canvas绘制南丁格尔玫瑰图(Nightingale rose diagram)

转载 作者:qq735679552 更新时间:2022-09-27 22:32:09 27 4
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南丁格尔玫瑰图 在常规图表中实在很惊艳,但我初看没看懂,一查原来南丁格尔这么伟大,确实值得尊敬.

再仔细研究了下这种图的构成,发现原来就是把柱形图的柱形换成了扇形图的半径来表示,当然,变种有好多,我这只是说我理解的这种.

知道了其构成方式后就好实现了,依传入参数个数决定其扇形角度,依百分比决定其扇形的半径长度,然后就一切都水到渠成了.

漂亮的美图献上

Android中使用Canvas绘制南丁格尔玫瑰图(Nightingale rose diagram)

附上实现代码

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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);
            
     }
 
}

  。

代码实现起来很容易,但这种图的设计创意确实非常好。 叹服.

一定要附上南丁格尔维基百科的链接:      http://zh.wikipedia.org/wiki/%e5%bc%97%e7%be%85%e5%80%ab%e6%96%af%c2%b7%e5%8d%97%e4%b8%81%e6%a0%bc%e7%88%be 。

感兴趣的可以看看.

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