图表网上有很多第三方工具,但是往往都会受到一些限制,于是用canvas画pieChart.
- Java代码
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- int areaX = 1;
- int areaY = 22;
- int areaWidth;
- int areaHight;
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- int colors[];
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- int percent[];
- int tempAngle = 0;
- private Bitmap bitmap;
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- private float centerX,centerY;
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- private float bigR;
- private Canvas canvas;
- Bitmap OverlayBitmap;
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- private int width;
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- private int height;
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- @Override
- protected void onDraw(Canvas canvas) {
- super.onDraw(canvas);
- this.canvas = canvas;
- centerX = width / 2;
- centerY = height / 2;
- bigR = (width - 80) / 2;
- areaWidth = width - 2;
- areaHight = height - 2;
- Paint paint = new Paint();
- paint.setColor(Color.RED);
- paint.setStyle(Style.FILL);
- paint.setAntiAlias(true);
- paint.setStrokeWidth(1);
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- canvas.save();
- canvas.rotate(mDegree);
- canvas.translate(centerX, centerY);
- for (int j = 0; j < percent.length; j++) {
- paint.setColor(colors[j]);
- canvas.drawArc(new RectF(-bigR, -bigR,bigR, bigR), tempAngle,percent[j],
- true,paint);tempAngle += percent[j];
- }
- canvas.restore();
- }
把在饼图上占的各个部分,由在初始化此view时传参,代码便灵活使用
- Java代码
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- int[] colors =new int[]{Color.rgb(255, 0, 68),Color.rgb(4, 227, 66),Color.rgb(120, 120, 120),Color.rgb(255, 145, 0)};
- int[] percent = new int[]{50,140,100,70};
- PieView pieView = new PieView(this,width,height,colors,percent);
percent 在饼图上所占的比例,无论里面有几个元素,总和都必须是360,不然画出来是有空缺的.
- Java代码
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- int mDegree = 0;
- int mPreDegree = 0;
- public void calcDegree(boolean bFlag) {
- if (mDegree >= 360) {
- mDegree -= 360;
- }
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- if (mDegree < 0) {
- mDegree += 360;
- }
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- mPreDegree = mDegree;
- }
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- @Override
- public boolean onKeyDown(int keyCode, KeyEvent event) {
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- switch (keyCode) {
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- case KeyEvent.KEYCODE_DPAD_LEFT:
- mDegree -= 6;
- calcDegree(false);
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- postInvalidate();
- break;
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- case KeyEvent.KEYCODE_DPAD_RIGHT:
- mDegree += 6;
- calcDegree(false);
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- postInvalidate();
- break;
- default:
- break;
- }
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- return super.onKeyDown(keyCode, event);
- }
本文转自06peng 51CTO博客,原文链接:http://blog.51cto.com/06peng/963352,如需转载请自行联系原作者