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Refactor adjustCoordsForRationalScale to Get Rid of Code Duplication and Improve Comprehensibility

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jklingen 2021-03-27 17:39:31 +01:00
commit 13e91104e1
1 changed files with 49 additions and 71 deletions
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120
Greenshot/Helpers/ScaleHelper.cs
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@ -227,92 +227,70 @@ namespace Greenshot.Helpers {
/// <param name="resizeHandlePosition">position of the handle/gripper being used for resized, see Position</param>
/// <param name="resizeHandleCoords">coordinates of the used handle/gripper, adjusted coordinates will be written to this reference</param>
private static void adjustCoordsForRationalScale(RectangleF originalRectangle, Positions resizeHandlePosition, ref PointF resizeHandleCoords) {
float originalRatio = originalRectangle.Width / originalRectangle.Height;
float newWidth, newHeight, newRatio;
int flippedRatioSign;
SizeF selectedRectangle, newSize;
switch(resizeHandlePosition) {
case Positions.TopLeft:
newWidth = originalRectangle.Right - resizeHandleCoords.X;
newHeight = originalRectangle.Bottom - resizeHandleCoords.Y;
newRatio = newWidth / newHeight;
flippedRatioSign = Math.Sign(newRatio) * Math.Sign(originalRatio);
if (Math.Abs(newRatio) > Math.Abs(originalRatio)) {
// scaled rectangle (ratio) would be wider than original
// keep height and tweak width to maintain aspect ratio
float tweakedWidth = newHeight * originalRatio * flippedRatioSign;
resizeHandleCoords.X = originalRectangle.Right - tweakedWidth;
} else if(Math.Abs(newRatio) < Math.Abs(originalRatio)) {
// scaled rectangle (ratio) would be taller than original
// keep width and tweak height to maintain aspect ratio
float tweakedHeight = newWidth / originalRatio * flippedRatioSign;
resizeHandleCoords.Y = originalRectangle.Bottom - tweakedHeight;
}
selectedRectangle = new SizeF(originalRectangle.Right - resizeHandleCoords.X, originalRectangle.Bottom - resizeHandleCoords.Y);
newSize = getNewSizeForRationalScale(originalRectangle.Size, selectedRectangle);
resizeHandleCoords.X = originalRectangle.Right - newSize.Width;
resizeHandleCoords.Y = originalRectangle.Bottom - newSize.Height;
break;
case Positions.TopRight:
newWidth = resizeHandleCoords.X - originalRectangle.Left;
newHeight = originalRectangle.Bottom - resizeHandleCoords.Y;
newRatio = newWidth / newHeight;
flippedRatioSign = Math.Sign(newRatio) * Math.Sign(originalRatio);
if (Math.Abs(newRatio) > Math.Abs(originalRatio)) {
// scaled rectangle (ratio) would be wider than original
// keep height and tweak width to maintain aspect ratio
float tweakedWidth = newHeight * originalRatio * flippedRatioSign;
resizeHandleCoords.X = originalRectangle.Left + tweakedWidth;
}
else if (Math.Abs(newRatio) < Math.Abs(originalRatio)) {
// scaled rectangle (ratio) would be taller than original
// keep width and tweak height to maintain aspect ratio
float tweakedHeight = newWidth / originalRatio * flippedRatioSign;
resizeHandleCoords.Y = originalRectangle.Bottom - tweakedHeight;
}
selectedRectangle = new SizeF(resizeHandleCoords.X - originalRectangle.Left, originalRectangle.Bottom - resizeHandleCoords.Y);
newSize = getNewSizeForRationalScale(originalRectangle.Size, selectedRectangle);
resizeHandleCoords.X = originalRectangle.Left + newSize.Width;
resizeHandleCoords.Y = originalRectangle.Bottom - newSize.Height;
break;
case Positions.BottomLeft:
newWidth = originalRectangle.Right - resizeHandleCoords.X;
newHeight = resizeHandleCoords.Y - originalRectangle.Top;
newRatio = newWidth / newHeight;
flippedRatioSign = Math.Sign(newRatio) * Math.Sign(originalRatio);
if (Math.Abs(newRatio) > Math.Abs(originalRatio)) {
// scaled rectangle (ratio) would be wider than original
// keep height and tweak width to maintain aspect ratio
float tweakedWidth = newHeight * originalRatio * flippedRatioSign;
resizeHandleCoords.X = originalRectangle.Right - tweakedWidth;
}
else if (Math.Abs(newRatio) < Math.Abs(originalRatio)) {
// scaled rectangle (ratio) would be taller than original
// keep width and tweak height to maintain aspect ratio
float tweakedHeight = newWidth / originalRatio * flippedRatioSign;
resizeHandleCoords.Y = originalRectangle.Top + tweakedHeight;
}
selectedRectangle = new SizeF(originalRectangle.Right - resizeHandleCoords.X, resizeHandleCoords.Y - originalRectangle.Top);
newSize = getNewSizeForRationalScale(originalRectangle.Size, selectedRectangle);
resizeHandleCoords.X = originalRectangle.Right - newSize.Width;
resizeHandleCoords.Y = originalRectangle.Top + newSize.Height;
break;
case Positions.BottomRight:
newWidth = resizeHandleCoords.X - originalRectangle.Left;
newHeight = resizeHandleCoords.Y - originalRectangle.Top;
newRatio = newWidth / newHeight;
flippedRatioSign = Math.Sign(newRatio) * Math.Sign(originalRatio);
if (Math.Abs(newRatio) > Math.Abs(originalRatio)) {
// scaled rectangle (ratio) would be wider than original
// keep height and tweak width to maintain aspect ratio
float tweakedWidth = newHeight * originalRatio * flippedRatioSign;
resizeHandleCoords.X = originalRectangle.Left + tweakedWidth;
}
else if (Math.Abs(newRatio) < Math.Abs(originalRatio)) {
// TODO this is the same code as else if for topleft!
// scaled rectangle (ratio) would be taller than original
// keep width and tweak height to maintain aspect ratio
float tweakedHeight = newWidth / originalRatio * flippedRatioSign;
resizeHandleCoords.Y = originalRectangle.Top + tweakedHeight;
}
selectedRectangle = new SizeF(resizeHandleCoords.X - originalRectangle.Left, resizeHandleCoords.Y - originalRectangle.Top);
newSize = getNewSizeForRationalScale(originalRectangle.Size, selectedRectangle);
resizeHandleCoords.X = originalRectangle.Left + newSize.Width;
resizeHandleCoords.Y = originalRectangle.Top + newSize.Height;
break;
}
}
/// <summary>
/// For an original size, and a selected size, returns the the largest possible size that
/// * has the same aspect ratio as the original
/// * fits into selected size
/// </summary>
/// <param name="originalSize">size to be considered for keeping aspect ratio</param>
/// <param name="selectedSize">selection size (i.e. the size we'd produce if we wouldn't keep aspect ratio)</param>
/// <returns></returns>
private static SizeF getNewSizeForRationalScale(SizeF originalSize, SizeF selectedSize)
{
SizeF newSize = selectedSize;
float originalRatio = originalSize.Width / originalSize.Height;
float selectedRatio = selectedSize.Width / selectedSize.Height;
// will fix orientation if the scaling causes size to be flipped in any direction
int flippedRatioSign = Math.Sign(selectedRatio) * Math.Sign(originalRatio);
if (Math.Abs(selectedRatio) > Math.Abs(originalRatio))
{
// scaled rectangle (ratio) would be wider than original
// keep height and tweak width to maintain aspect ratio
newSize.Width = selectedSize.Height * originalRatio * flippedRatioSign;
}
else if (Math.Abs(selectedRatio) < Math.Abs(originalRatio))
{
// scaled rectangle (ratio) would be taller than original
// keep width and tweak height to maintain aspect ratio
newSize.Height = selectedSize.Width / originalRatio * flippedRatioSign;
}
return newSize;
}
public static void Scale(Rectangle boundsBeforeResize, int cursorX, int cursorY, ref RectangleF boundsAfterResize) {
Scale(boundsBeforeResize, cursorX, cursorY, ref boundsAfterResize, null);
}