Android Canvas練習(9)自已繪分割突出效果的餅圖(Pie Chart)

這裡畫了個餅圖的變種，具有分割突出效果的餅圖(Pie Chart)，就是個切蛋糕效果的餅圖，畫這種圖，其技巧就在於圓心的偏移。

在圓心偏移，半徑不變的基礎上，效果就出來了。

上圖:

怎麼樣，效果還是有模有樣的吧。<喎?/kf/ware/vc/" target="_blank" class="keylink">vcD4KPHA+ICAgICC0+sLruty88rWlo6y4vcnPOjwvcD4KPHA+ICAgICAgPHByZSBjbGFzcz0="brush:java;">package com.xcl.chart; /** * Canvas練習 * 自已繪分割突出效果的餅圖(Pie 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 PanelPieChart2 extends View{ private int ScrWidth,ScrHeight; //演示用的百分比例,實際使用中，即為外部傳入的比例參數 private final float arrPer[] = new float[]{20f,30f,10f,40f}; //RGB顏色數組 private final int arrColorRgb[][] = { {77, 83, 97}, {148, 159, 181}, {253, 180, 90}, {52, 194, 188}} ; //指定突出哪個塊 private final int offsetBlock = 2; public PanelPieChart2(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){ //畫布背景 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); //畫筆初始化 Paint PaintArc = new Paint(); Paint PaintLabel = new Paint(); PaintLabel.setColor(Color.WHITE); PaintLabel.setTextSize(16); //位置計算類 XChartCalc xcalc = new XChartCalc(); float Percentage = 0.0f; float CurrPer = 0.0f; int i= 0; for(i=0; i 代碼中只需注意下，指定要突出哪塊，就在哪塊上指定下偏移即可。

附上我其它繪制的圖鏈接:

Android Canvas練習(1)畫一張報表來玩

Android Canvas練習(2)自已繪餅圖

Android Canvas練習(3)自已繪柱形圖

Android Canvas練習(4)自已繪折線圖

Android Canvas練習(5)自已繪面積圖(Area Chart)

Android Canvas練習(7)繪制歐冠八強防守&控制率數據對比圖

Android Canvas練習(8)自已繪環形圖(Dount Chart)

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