// Private Methods /////////////////////////////////////////////////////////
/**
* Gets the aspect ratio of the resulting crop window if this handle were
* dragged to the given point.
*
* @param x the x-coordinate
* @param y the y-coordinate
* @return the aspect ratio
*/
private float GetAspectRatio(float x, float y)
{
// Replace the active edge coordinate with the given touch coordinate.
float left = (mVerticalEdge == EdgeManager.LEFT) ? x : EdgeManager.LEFT.coordinate;
float top = (mHorizontalEdge == EdgeManager.TOP) ? y : EdgeManager.TOP.coordinate;
float right = (mVerticalEdge == EdgeManager.RIGHT) ? x : EdgeManager.RIGHT.coordinate;
float bottom = (mHorizontalEdge == EdgeManager.BOTTOM) ? y : EdgeManager.BOTTOM.coordinate;
float aspectRatio = AspectRatioUtil.calculateAspectRatio(left, top, right, bottom);
return(aspectRatio);
}
/**
* Set the initial crop window size and position. This is dependent on the
* size and position of the image being cropped.
*
* @param bitmapRect the bounding box around the image being cropped
*/
private void InitCropWindow(Rect bitmapRect)
{
try
{
// Tells the attribute functions the crop window has already been
// initialized
if (initializedCropWindow == false)
{
initializedCropWindow = true;
}
if (mFixAspectRatio)
{
// If the image aspect ratio is wider than the crop aspect ratio,
// then the image height is the determining initial length. Else,
// vice-versa.
if (AspectRatioUtil.calculateAspectRatio(bitmapRect) > mTargetAspectRatio)
{
EdgeManager.TOP.coordinate = bitmapRect.Top;
EdgeManager.BOTTOM.coordinate = bitmapRect.Bottom;
float centerX = Width / 2f;
// Limits the aspect ratio to no less than 40 wide or 40 tall
float cropWidth = Math.Max(Edge.MIN_CROP_LENGTH_PX,
AspectRatioUtil.calculateWidth(EdgeManager.TOP.coordinate,
EdgeManager.BOTTOM.coordinate,
mTargetAspectRatio));
// Create new TargetAspectRatio if the original one does not fit
// the screen
if (cropWidth == Edge.MIN_CROP_LENGTH_PX)
{
mTargetAspectRatio = (Edge.MIN_CROP_LENGTH_PX) /
(EdgeManager.BOTTOM.coordinate - EdgeManager.TOP.coordinate);
}
float halfCropWidth = cropWidth / 2f;
EdgeManager.LEFT.coordinate = (centerX - halfCropWidth);
EdgeManager.RIGHT.coordinate = (centerX + halfCropWidth);
}
else
{
EdgeManager.LEFT.coordinate = bitmapRect.Left;
EdgeManager.RIGHT.coordinate = bitmapRect.Right;
float centerY = Height / 2f;
// Limits the aspect ratio to no less than 40 wide or 40 tall
float cropHeight = Math.Max(Edge.MIN_CROP_LENGTH_PX,
AspectRatioUtil.calculateHeight(EdgeManager.LEFT.coordinate,
EdgeManager.RIGHT.coordinate,
mTargetAspectRatio));
// Create new TargetAspectRatio if the original one does not fit
// the screen
if (cropHeight == Edge.MIN_CROP_LENGTH_PX)
{
mTargetAspectRatio = (EdgeManager.RIGHT.coordinate - EdgeManager.LEFT.coordinate) /
Edge.MIN_CROP_LENGTH_PX;
}
float halfCropHeight = cropHeight / 2f;
EdgeManager.TOP.coordinate = (centerY - halfCropHeight);
EdgeManager.BOTTOM.coordinate = (centerY + halfCropHeight);
}
}
else
{
// ... do not fix aspect ratio...
// Initialize crop window to have 10% padding w/ respect to image.
float horizontalPadding = 0.1f * bitmapRect.Width();
float verticalPadding = 0.1f * bitmapRect.Height();
EdgeManager.LEFT.coordinate = (bitmapRect.Left + horizontalPadding);
EdgeManager.TOP.coordinate = (bitmapRect.Top + verticalPadding);
EdgeManager.RIGHT.coordinate = (bitmapRect.Right - horizontalPadding);
EdgeManager.BOTTOM.coordinate = (bitmapRect.Bottom - verticalPadding);
}
}
catch (Exception ex)
{
ex.ToString();
}
}