// HandleHelper Methods ////////////////////////////////////////////////////
public override void UpdateCropWindow(float x,
float y,
float targetAspectRatio,
Rect imageRect,
float snapRadius)
{
// Adjust this EdgeType accordingly.
mEdgeType.adjustCoordinate(x, y, imageRect, snapRadius, targetAspectRatio);
float left = EdgeManager.LEFT.coordinate;
float top = EdgeManager.TOP.coordinate;
float right = EdgeManager.RIGHT.coordinate;
float bottom = EdgeManager.BOTTOM.coordinate;
// After this EdgeType is moved, our crop window is now out of proportion.
float targetHeight = AspectRatioUtil.calculateHeight(left, right, targetAspectRatio);
float currentHeight = bottom - top;
// Adjust the crop window so that it maintains the given aspect ratio by
// moving the adjacent EdgeTypes symmetrically in or out.
float difference = targetHeight - currentHeight;
float halfDifference = difference / 2;
top -= halfDifference;
bottom += halfDifference;
EdgeManager.TOP.coordinate = top;
EdgeManager.BOTTOM.coordinate = bottom;
// Check if we have gone out of bounds on the top or bottom, and fix.
if (EdgeManager.TOP.isOutsideMargin(imageRect, snapRadius) &&
!mEdgeType.isNewRectangleOutOfBounds(EdgeManager.TOP,
imageRect,
targetAspectRatio))
{
float offset = EdgeManager.TOP.snapToRect(imageRect);
EdgeManager.BOTTOM.offset(-offset);
mEdgeType.adjustCoordinate(targetAspectRatio);
}
if (EdgeManager.BOTTOM.isOutsideMargin(imageRect, snapRadius) &&
!mEdgeType.isNewRectangleOutOfBounds(EdgeManager.BOTTOM,
imageRect,
targetAspectRatio))
{
float offset = EdgeManager.BOTTOM.snapToRect(imageRect);
EdgeManager.TOP.offset(-offset);
mEdgeType.adjustCoordinate(targetAspectRatio);
}
}
/**
* 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();
}
}