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:

附上实现代码:

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

{

//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。

感兴趣的可以看看。