TouchImageView.java 文件源码

@Override
protected void onDraw(Canvas canvas) {
    onDrawReady = true;
    imageRenderedAtLeastOnce = true;
    if (delayedZoomVariables != null) {
        setZoom(delayedZoomVariables.scale, delayedZoomVariables.focusX, delayedZoomVariables.focusY, delayedZoomVariables.scaleType);
        delayedZoomVariables = null;
    }
    super.onDraw(canvas);
    if (!zooming) {
        buildDrawingCache();
    } else {

        bitmap = getDrawingCache();
        shader = new BitmapShader(bitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);

        paint = new Paint();
        paint.setShader(shader);
        eMatrix.reset();
        eMatrix.postScale(2f, 2f, zoomPos.x, zoomPos.y);
        paint.getShader().setLocalMatrix(eMatrix);
        canvas.drawCircle(zoomPos.x, zoomPos.y, sizeOfMagnifier, paint);
    }
}