//
// Set zoom to the specified scale. Image will be centered around the point
// (focusX, focusY). These floats range from 0 to 1 and denote the focus point
// as a fraction from the left and top of the view. For example, the top left
// corner of the image would be (0, 0). And the bottom right corner would be (1, 1).
// @param scale
// @param focusX
// @param focusY
// @param scaleType
//
public void SetZoom(float scale, float focusX, float focusY, ScaleType scaleType)
{
//
// setZoom can be called before the image is on the screen, but at this point,
// image and view sizes have not yet been calculated in onMeasure. Thus, we should
// delay calling setZoom until the view has been measured.
//
if (!_onDrawReady)
{
_delayedZoomVariables = new ZoomVariables(scale, focusX, focusY, scaleType);
return;
}
SetScaleType(scaleType);
ResetZoom();
ScaleImage(scale, ViewWidth / 2f, ViewHeight / 2f, false);
_matrix.GetValues(_m);
_m[Matrix.MtransX] = -((focusX * GetImageWidth()) - (ViewWidth * 0.5f));
_m[Matrix.MtransY] = -((focusY * GetImageHeight()) - (ViewHeight * 0.5f));
_matrix.SetValues(_m);
FixTrans();
ImageMatrix = _matrix;
}
