/// <summary>
/// Update cropped area.
/// </summary>
/// <param name="dragPosition">The control point</param>
/// <param name="diffPos">Position offset</param>
private void UpdateCroppedRectWithAspectRatio(DragPosition dragPosition, Point diffPos)
{
if (diffPos == default(Point) || !CanvasRect.IsValid())
{
return;
}
double radian = 0d, diffPointRadian = 0d, effectiveLength = 0d;
if (KeepAspectRatio)
{
radian = Math.Atan(UsedAspectRatio);
diffPointRadian = Math.Atan(diffPos.X / diffPos.Y);
}
var startPoint = new Point(_startX, _startY);
var endPoint = new Point(_endX, _endY);
var currentSelectedRect = new Rect(startPoint, endPoint);
switch (dragPosition)
{
case DragPosition.Top:
if (KeepAspectRatio)
{
var originSizeChange = new Point(-diffPos.Y * UsedAspectRatio, -diffPos.Y);
var safeChange = _restrictedSelectRect.GetSafeSizeChangeWhenKeepAspectRatio(dragPosition, currentSelectedRect, originSizeChange, UsedAspectRatio);
startPoint.X += -safeChange.X / 2;
endPoint.X -= -safeChange.X / 2;
startPoint.Y += -safeChange.Y;
}
else
{
startPoint.Y += diffPos.Y;
}
break;
case DragPosition.Bottom:
if (KeepAspectRatio)
{
var originSizeChange = new Point(diffPos.Y * UsedAspectRatio, diffPos.Y);
var safeChange = _restrictedSelectRect.GetSafeSizeChangeWhenKeepAspectRatio(dragPosition, currentSelectedRect, originSizeChange, UsedAspectRatio);
startPoint.X -= safeChange.X / 2;
endPoint.X += safeChange.X / 2;
endPoint.Y += safeChange.Y;
}
else
{
endPoint.Y += diffPos.Y;
}
break;
case DragPosition.Left:
if (KeepAspectRatio)
{
var originSizeChange = new Point(-diffPos.X, -diffPos.X / UsedAspectRatio);
var safeChange = _restrictedSelectRect.GetSafeSizeChangeWhenKeepAspectRatio(dragPosition, currentSelectedRect, originSizeChange, UsedAspectRatio);
startPoint.Y += -safeChange.Y / 2;
endPoint.Y -= -safeChange.Y / 2;
startPoint.X += -safeChange.X;
}
else
{
startPoint.X += diffPos.X;
}
break;
case DragPosition.Right:
if (KeepAspectRatio)
{
var originSizeChange = new Point(diffPos.X, diffPos.X / UsedAspectRatio);
var safeChange = _restrictedSelectRect.GetSafeSizeChangeWhenKeepAspectRatio(dragPosition, currentSelectedRect, originSizeChange, UsedAspectRatio);
startPoint.Y -= safeChange.Y / 2;
endPoint.Y += safeChange.Y / 2;
endPoint.X += safeChange.X;
}
else
{
endPoint.X += diffPos.X;
}
break;
case DragPosition.UpperLeft:
if (KeepAspectRatio)
{
effectiveLength = diffPos.Y / Math.Cos(diffPointRadian) * Math.Cos(diffPointRadian - radian);
var originSizeChange = new Point(-effectiveLength * Math.Sin(radian), -effectiveLength * Math.Cos(radian));
var safeChange = _restrictedSelectRect.GetSafeSizeChangeWhenKeepAspectRatio(dragPosition, currentSelectedRect, originSizeChange, UsedAspectRatio);
diffPos.X = -safeChange.X;
diffPos.Y = -safeChange.Y;
}
startPoint.X += diffPos.X;
startPoint.Y += diffPos.Y;
break;
case DragPosition.UpperRight:
if (KeepAspectRatio)
{
diffPointRadian = -diffPointRadian;
effectiveLength = diffPos.Y / Math.Cos(diffPointRadian) * Math.Cos(diffPointRadian - radian);
var originSizeChange = new Point(-effectiveLength * Math.Sin(radian), -effectiveLength * Math.Cos(radian));
var safeChange = _restrictedSelectRect.GetSafeSizeChangeWhenKeepAspectRatio(dragPosition, currentSelectedRect, originSizeChange, UsedAspectRatio);
diffPos.X = safeChange.X;
diffPos.Y = -safeChange.Y;
}
endPoint.X += diffPos.X;
startPoint.Y += diffPos.Y;
break;
case DragPosition.LowerLeft:
if (KeepAspectRatio)
{
diffPointRadian = -diffPointRadian;
effectiveLength = diffPos.Y / Math.Cos(diffPointRadian) * Math.Cos(diffPointRadian - radian);
var originSizeChange = new Point(effectiveLength * Math.Sin(radian), effectiveLength * Math.Cos(radian));
var safeChange = _restrictedSelectRect.GetSafeSizeChangeWhenKeepAspectRatio(dragPosition, currentSelectedRect, originSizeChange, UsedAspectRatio);
diffPos.X = -safeChange.X;
diffPos.Y = safeChange.Y;
}
startPoint.X += diffPos.X;
endPoint.Y += diffPos.Y;
break;
case DragPosition.LowerRight:
if (KeepAspectRatio)
{
effectiveLength = diffPos.Y / Math.Cos(diffPointRadian) * Math.Cos(diffPointRadian - radian);
var originSizeChange = new Point(effectiveLength * Math.Sin(radian), effectiveLength * Math.Cos(radian));
var safeChange = _restrictedSelectRect.GetSafeSizeChangeWhenKeepAspectRatio(dragPosition, currentSelectedRect, originSizeChange, UsedAspectRatio);
diffPos.X = safeChange.X;
diffPos.Y = safeChange.Y;
}
endPoint.X += diffPos.X;
endPoint.Y += diffPos.Y;
break;
}
if (!RectExtensions.IsSafeRect(startPoint, endPoint, MinSelectSize))
{
if (KeepAspectRatio)
{
if ((endPoint.Y - startPoint.Y) < (_endY - _startY) ||
(endPoint.X - startPoint.X) < (_endX - _startX))
{
return;
}
}
else
{
var safeRect = RectExtensions.GetSafeRect(startPoint, endPoint, MinSelectSize, dragPosition);
safeRect.Intersect(_restrictedSelectRect);
startPoint = new Point(safeRect.X, safeRect.Y);
endPoint = new Point(safeRect.X + safeRect.Width, safeRect.Y + safeRect.Height);
}
}
var isEffectiveRegion = _restrictedSelectRect.IsSafePoint(startPoint) &&
_restrictedSelectRect.IsSafePoint(endPoint);
var selectedRect = new Rect(startPoint, endPoint);
if (!isEffectiveRegion)
{
if (_restrictedSelectRect.GetContainsRect(ref selectedRect))
{
startPoint = new Point(selectedRect.Left, selectedRect.Top);
endPoint = new Point(selectedRect.Right, selectedRect.Bottom);
}
else
{
return;
}
}
selectedRect.Union(CanvasRect);
if (selectedRect != CanvasRect)
{
var croppedRect = _inverseImageTransform.TransformBounds(
new Rect(startPoint, endPoint));
croppedRect.Intersect(_restrictedCropRect);
_currentCroppedRect = croppedRect;
var viewportRect = CanvasRect.GetUniformRect(selectedRect.Width / selectedRect.Height);
var viewportImgRect = _inverseImageTransform.TransformBounds(selectedRect);
UpdateImageLayoutWithViewport(viewportRect, viewportImgRect);
}
else
{
UpdateSelectedRect(startPoint, endPoint);
}
}
/// <summary>
/// Update cropped area.
/// </summary>
/// <param name="dragPosition">The control point</param>
/// <param name="diffPos">Position offset</param>
private void UpdateCroppedRectWithAspectRatio(DragPosition dragPosition, Point diffPos)
{
double radian = 0d, diffPointRadian = 0d, effectiveLength = 0d;
if (KeepAspectRatio)
{
radian = Math.Atan(UsedAspectRatio);
diffPointRadian = Math.Atan(diffPos.X / diffPos.Y);
}
var startPoint = new Point(_startX, _startY);
var endPoint = new Point(_endX, _endY);
switch (dragPosition)
{
case DragPosition.Top:
startPoint.Y += diffPos.Y;
if (KeepAspectRatio)
{
var changeX = diffPos.Y * UsedAspectRatio;
startPoint.X += changeX / 2;
endPoint.X -= changeX / 2;
}
break;
case DragPosition.Bottom:
endPoint.Y += diffPos.Y;
if (KeepAspectRatio)
{
var changeX = diffPos.Y * UsedAspectRatio;
startPoint.X -= changeX / 2;
endPoint.X += changeX / 2;
}
break;
case DragPosition.Left:
startPoint.X += diffPos.X;
if (KeepAspectRatio)
{
var changeY = diffPos.X / UsedAspectRatio;
startPoint.Y += changeY / 2;
endPoint.Y -= changeY / 2;
}
break;
case DragPosition.Right:
endPoint.X += diffPos.X;
if (KeepAspectRatio)
{
var changeY = diffPos.X / UsedAspectRatio;
startPoint.Y -= changeY / 2;
endPoint.Y += changeY / 2;
}
break;
case DragPosition.UpperLeft:
if (KeepAspectRatio)
{
effectiveLength = diffPos.Y / Math.Cos(diffPointRadian) * Math.Cos(diffPointRadian - radian);
diffPos.X = effectiveLength * Math.Sin(radian);
diffPos.Y = effectiveLength * Math.Cos(radian);
}
startPoint.X += diffPos.X;
startPoint.Y += diffPos.Y;
break;
case DragPosition.UpperRight:
if (KeepAspectRatio)
{
diffPointRadian = -diffPointRadian;
effectiveLength = diffPos.Y / Math.Cos(diffPointRadian) * Math.Cos(diffPointRadian - radian);
diffPos.X = -effectiveLength *Math.Sin(radian);
diffPos.Y = effectiveLength * Math.Cos(radian);
}
endPoint.X += diffPos.X;
startPoint.Y += diffPos.Y;
break;
case DragPosition.LowerLeft:
if (KeepAspectRatio)
{
diffPointRadian = -diffPointRadian;
effectiveLength = diffPos.Y / Math.Cos(diffPointRadian) * Math.Cos(diffPointRadian - radian);
diffPos.X = -effectiveLength *Math.Sin(radian);
diffPos.Y = effectiveLength * Math.Cos(radian);
}
startPoint.X += diffPos.X;
endPoint.Y += diffPos.Y;
break;
case DragPosition.LowerRight:
if (KeepAspectRatio)
{
effectiveLength = diffPos.Y / Math.Cos(diffPointRadian) * Math.Cos(diffPointRadian - radian);
diffPos.X = effectiveLength * Math.Sin(radian);
diffPos.Y = effectiveLength * Math.Cos(radian);
}
endPoint.X += diffPos.X;
endPoint.Y += diffPos.Y;
break;
}
if (!RectExtensions.IsSafeRect(startPoint, endPoint, MinSelectSize))
{
if (KeepAspectRatio)
{
if ((endPoint.Y - startPoint.Y) < (_endY - _startY) ||
(endPoint.X - startPoint.X) < (_endX - _startX))
{
return;
}
}
else
{
var safeRect = RectExtensions.GetSafeRect(startPoint, endPoint, MinSelectSize, dragPosition);
safeRect.Intersect(_restrictedSelectRect);
startPoint = new Point(safeRect.X, safeRect.Y);
endPoint = new Point(safeRect.X + safeRect.Width, safeRect.Y + safeRect.Height);
}
}
var isEffectiveRegion = _restrictedSelectRect.IsSafePoint(startPoint) &&
_restrictedSelectRect.IsSafePoint(endPoint);
if (!isEffectiveRegion)
{
return;
}
var selectedRect = new Rect(startPoint, endPoint);
selectedRect.Union(CanvasRect);
if (selectedRect != CanvasRect)
{
var inverseImageTransform = _imageTransform.Inverse;
if (inverseImageTransform == null)
{
return;
}
var croppedRect = inverseImageTransform.TransformBounds(
new Rect(startPoint, endPoint));
croppedRect.Intersect(_restrictedCropRect);
_currentCroppedRect = croppedRect;
var viewportRect = CanvasRect.GetUniformRect(selectedRect.Width / selectedRect.Height);
var viewportImgRect = inverseImageTransform.TransformBounds(selectedRect);
UpdateImageLayoutWithViewport(viewportRect, viewportImgRect);
}
else
{
UpdateSelectedRect(startPoint, endPoint);
}
}