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

繼續常規圖的繪制研究，在這繪制了個環形圖(Dount Chart),很簡單，大圓套小圓就出來了。呵呵，照例先上猛照:

vcnPOiAgICAgICAgIDwvcD4KPHA+PHByZSBjbGFzcz0="brush:java;">package com.xcl.chart; /** * Canvas練習 * 自已畫環形圖(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,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}} ; 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){ //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(); 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); //位置計算類 XChartCalc xcalc = new XChartCalc(); float Percentage = 0.0f; float CurrPer = 0.0f; int i= 0; for(i=0; i

就這很麼點代碼就搞定了。 所以說簡單的圖完全可以不用圖表庫的。

代碼中用到的類，在我前面的例子中找即可。

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)

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