Question

我试图将一个位图绘制到画布上。它导致拉伸位图。我想要的是如果图像较小则不拉伸，如果图像大于显示器则裁剪图像。如何实现这一目标。

我有一个自定义drawable，扩展了DrawableWrapper

    public class MyDrawable extends DrawableWrapper {
public MyDrawable(Drawable drawable) {
        super(drawable);


    }
    public MyDrawable(final Context context, Bitmap bitmap) {
        this(new BitmapDrawable(context.getResources(),bitmap));
}

我在boundsChnage（）

中使用此代码

    protected void onBoundsChange(Rect bounds) {
    mBitmap = Bitmap.createBitmap(bounds.width(), bounds.height(), Bitmap.Config.ARGB_8888);
            Canvas canvas = new Canvas(mBitmap);
            super.draw(canvas);
}

这导致拉伸拉伸的可拉伸部分的裁剪部分。

Answer 1

i think it will help you.

Bitmap scaleBitmap = scaleBitmap(bitmap);
RectF rectF = new RectF(0, (mHeight scaleBitmap.getHeight()),
scaleBitmap.getWidth(), scaleBitmap.getHeight());
canvas.drawBitmap(scaleBitmap, null, rectF, null);

private Bitmap scaleBitmap(Bitmap bm) {
        int width = bm.getWidth();
        int height = bm.getHeight();

        Log.v("Pictures", "Width and height are " + width + "--" + height);
        int mWidth = this.getResources().getDisplayMetrics().widthPixels;
        int mHeight = this.getResources().getDisplayMetrics().heightPixels;
        if (width > height) {
            // landscape
            int ratio = width / mWidth;
            width = mWidth;
            height = height / ratio;
        } else if (height > width) {
            // portrait
            int ratio = height / mHeight;
            height = mHeight;
            width = width / ratio;
        } else {
            // square
            height = mWidth;
            width = mWidth;
        }

        Log.v("Pictures", "after scaling Width and height are " + width + "--" + height);

        bm = Bitmap.createScaledBitmap(bm, width, height, true);
        return bm;
    }

android：绘制到画布而不拉伸

1 个答案: