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我需要缩放图像。但问题是，如果我用不同的 x,y 缩放 secunde 时间，则图像向左或向右跳跃。

我需要在点 x,y -> canvas.scale(scale, scale, x, y); 缩放 不在点 0,0 -> canvas.scale(scale, scale);

public class Img extends View {
private Paint paint;

private Rect imgRect; 
private Bitmap img;

private int h, w;
private int x, y;
private float scale = 1f;

private int scaleX, scaleY;
private int aScaleX, aScaleY;

public img(Context context) {
    super(context);

    paint = new Paint();

    img = BitmapFactory.decodeResource(getResources(), R.drawable.uebersicht);
    w = 1330;
    h = 846;     
    imgRect = new Rect(0, 0, w, h);     
}

@Override
protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);               

    canvas.scale(scale, scale, scaleX, scaleY);

    paint.setColor(Color.WHITE); 
    canvas.drawBitmap(img, null, imgRect, paint);       

    canvas.restore();

    paint.setColor(Color.RED);
    paint.setTextSize(30);
    canvas.drawText(String.valueOf(scale), 10, 25, paint);
}   

public void reDrawPos(int rX, int rY) {
    x -= rX;
    y -= rY;

    calcImg();      
    invalidate();       
}

public void reDrawScale(float s) {
    scale = s;  

    calcImg();      
    invalidate();
}

private void calcImg() {
    mapRect.set(x, y, x+w, y+h);
}

public float scaleSet(int sX, int sY) { 
    scaleX = sX;
    scaleY = sY;

    return scale;
}}

谁能帮我？

感谢帮助 Bobert

4

1 回答 1

1

有一个方便的方法叫做 Matrix.setRectToRect(RectF, RectF, ScaleToFit) 可以帮助你。

Matrix imageMatrix = imageView.getImageMatrix();
RectF drawableRect = new RectF(0, 0, imageWidth, imageHeight);
RectF viewRect = new RectF(0, 0, imageView.getWidth(), imageView.getHeight());
imageMatrix.setRectToRect(drawableRect, viewRect, Matrix.ScaleToFit.CENTER);
imageView.setImageMatrix(m);

这应该将矩阵 imageMatrix 设置为具有缩放和转换值的组合，这些值是显示可绘制居中并适合 ImageView 小部件所需的。

@Override
public void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    canvas.save();
    canvas.setMatrix(imageMatrix);
    ((BitmapDrawable)mIcon).draw(canvas);
    canvas.restore();
}
于 2013-06-05T08:35:38.130 回答