/// <summary>
/// first calculates the resize width and height if required, and then resizes the image based on them
/// </summary>
/// <param name="image"></param>
/// <param name="imageAlterationParams"></param>
/// <returns></returns>
public static Bitmap ResizeImage(Bitmap image, ImageAlterationParams imageAlterationParams)
{
if (imageAlterationParams.ResizeType == ResizeType.ComputeSizeBasedOnPtDensity)
{
return(GetResizedImage(image, imageAlterationParams.MoldPtDensity));
}
if (imageAlterationParams.ResizeType == ResizeType.ResizeSufficiently)
{
return(GetSufficientlyResizedImage(image));
}
if (imageAlterationParams.ResizeType == ResizeType.ToSpecifiedSizes)
{
return(GetResizedBitmap(imageAlterationParams.SpecificResizeWidth, imageAlterationParams.SpecificResizeHeight, image));
}
throw new Exception("No resize type specified or could not handle the specified resize type");
}
public static Bitmap GetCroppedImage(ImageClickInputDetails clickInputDetails, Bitmap image, ImageAlterationParams imageAlterationParams)
{
var imgCornersExtra = GetImgCornersWithExtraPadding(clickInputDetails, image, imageAlterationParams);
if (imgCornersExtra.Left >= 0 && imgCornersExtra.Right < image.Width)
{
//crop image from all side
var rectangle = new Rectangle((int)imgCornersExtra.Left, (int)imgCornersExtra.Top, (int)imgCornersExtra.Width, (int)imgCornersExtra.Height);
return(image.Clone(rectangle, image.PixelFormat));
}
else
{
//prepare a new image
var newImg = new Bitmap(Convert.ToInt32(imgCornersExtra.Width), Convert.ToInt32(imgCornersExtra.Height), image.PixelFormat);
var g = Graphics.FromImage(newImg);
g.Clear(imageAlterationParams.InvalidColor);
g.InterpolationMode = InterpolationMode.HighQualityBilinear;
//when overlaying the image, give the top coordinate in the negative direction so that it gets cropped to the top pixel
var topOfImageForOverlay = -imgCornersExtra.Top;
if (imgCornersExtra.Left > 0)
{
//needs trimming from the left
var rectangle = new Rectangle((int)imgCornersExtra.Left, 0, (int)(image.Width - imgCornersExtra.Left - 1), image.Height);
image = image.Clone(rectangle, image.PixelFormat);
g.DrawImage(image, 0, (int)topOfImageForOverlay, image.Width, image.Height);
}
else
{
var moveForwardBy = -imgCornersExtra.Left;
g.DrawImage(image, (int)moveForwardBy, (int)topOfImageForOverlay, image.Width, image.Height);
}
g.Dispose();
return(newImg);
}
}
private static ImageCorners GetImgCornersWithExtraPadding(ImageClickInputDetails clickInputs, Bitmap image, ImageAlterationParams imageAlterationParams)
{
//image corners with respect to the dimensions of click area
var clickImgCorners = ImageCorners.GetImageCornersFromClickInputs(clickInputs, imageAlterationParams.MinImageHeightRatio, imageAlterationParams.BottomPaddingPercent);
//image corners in actual image dimension
var actualImgCorners = ImageCorners.GetActualImageCorners(clickImgCorners, image, clickInputs.ClickPositionListForImages);
//image corners with extra padding on on each side of disc
return(GetModifiedImgCornersForExtraWidth(actualImgCorners, imageAlterationParams.PercentExtraWidth));
}
