ImageViewTouchBase.java 文件源码

protected void zoomOut(float rate) {
    if (bitmapDisplayed.getBitmap() == null) {
        return;
    }

    float cx = getWidth() / 2F;
    float cy = getHeight() / 2F;

    // Zoom out to at most 1x
    Matrix tmp = new Matrix(suppMatrix);
    tmp.postScale(1F / rate, 1F / rate, cx, cy);

    if (getScale(tmp) < 1F) {
        suppMatrix.setScale(1F, 1F, cx, cy);
    } else {
        suppMatrix.postScale(1F / rate, 1F / rate, cx, cy);
    }
    setImageMatrix(getImageViewMatrix());
    center();
}