我从网络接收样本(浮点阵列)并将它们绘制为SurfaceView中的曲线。样本会定期更新,因此曲线是动态的。 在我的计划,我创造出的曲线将被抽入,这样的位图:Android位图/画布放大或缩小
Bitmap bmp = Bitmap.createBitmap(width, height, Config.ARGB_4444);
Canvas canvas = new Canvas(bmp);
drawCurve(canvas);
void drawCurve(Canvas canvas, float[] buffer) {
...
canvas.drawLine(x1, buffer[i], x2, buffer[i+1], paint);
...
}
...
private class RenderThread extends Thread {
public void run() {
c = mHolder.lockCanvas(null);
c.drawBitmap(bmp, 0, 0, null);
mHolder.unlockCanvasAndPost(c);
...
}
}
我想支持的曲线可以放大和缩小。为了有效地绘制曲线,绘制曲线方法只是更新新样本,也就是说,擦除旧区域,并在该区域绘制新样本。我能怎么做?谢谢!
http://stackoverflow.com/questions/7704086/how -do -i-modify-touchimageview-with-two-tap-to-zoom-in-and-out/7816495#7816495这将包含一个库,将解决问题 – ingsaurabh