private Size CalculatePageImageSize()
{
try
{
// check and convert page format units to selected units
double selectedFormatWidth = selectedFormat.Width();
double selectedFormatHeight = selectedFormat.Height();
if (selectedFormat.Units() != selectedUnit)
{
if (selectedUnit == cm)
{
selectedFormatWidth = UoM.ConvertInchToCM(selectedFormatWidth);
selectedFormatHeight = UoM.ConvertInchToCM(selectedFormatHeight);
}
else
{
selectedFormatWidth = UoM.ConvertCMtoInch(selectedFormatWidth);
selectedFormatHeight = UoM.ConvertCMtoInch(selectedFormatHeight);
}
}
// account for margin
double imageWidth = selectedFormatWidth - marginSides * 2;
double imageHeight = selectedFormatHeight - marginTop * 2;
// calculate pixel dimensions
int width = selectedUnit.ToPixels(imageWidth);
int height = selectedUnit.ToPixels(imageHeight);
Size size = new Size(width, height);
return(size);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
return(new Size(0, 0));
}
}
private void GeneratePageImages(Size imageSize, double xScale, double yScale)
{
// clear old lists
imageListPages.Images.Clear();
pagesList.Clear();
listViewPrintPreview.Clear();
foreach (Image p in generatedPagesList)
{
p.Dispose();
}
generatedPagesList.Clear();
// get size for cutting before resizing to page size
Size cutImageSize = new Size((int)(imageSize.Width / xScale), (int)(imageSize.Height / xScale));
Console.WriteLine("Calculated cut size from preview image: " + cutImageSize);
// get overlap values in pixels to scale
int pixelOverlapTop = (int)(selectedUnit.ToPixels(overlapTop) / yScale);
int pixelOverlapSides = (int)(selectedUnit.ToPixels(overlapSides) / xScale);
// get margin values
int pixelMarginTop = selectedUnit.ToPixels(marginTop);
int pixelMarginSides = selectedUnit.ToPixels(marginSides);
// check and convert page format units to selected units
double selectedFormatWidth = selectedFormat.Width();
double selectedFormatHeight = selectedFormat.Height();
if (selectedFormat.Units() != selectedUnit)
{
if (selectedUnit == cm)
{
selectedFormatWidth = UoM.ConvertInchToCM(selectedFormatWidth);
selectedFormatHeight = UoM.ConvertInchToCM(selectedFormatHeight);
}
else
{
selectedFormatWidth = UoM.ConvertCMtoInch(selectedFormatWidth);
selectedFormatHeight = UoM.ConvertCMtoInch(selectedFormatHeight);
}
}
// get graphics of edit image
Graphics editGraphics = Graphics.FromImage(editImage);
// create rectangle for cutting and drawing
Rectangle cutRectangle = new Rectangle(0, 0, cutImageSize.Width, cutImageSize.Height);
// create pen for drawing on preview
Pen pen = new Pen(Color.Red, 2);
// for entire height of image
for (int y = 0; y < editImage.Height; y += (cutImageSize.Height - pixelOverlapTop))
{
// for each width of image
for (int x = 0; x < editImage.Width; x += (cutImageSize.Width - pixelOverlapSides))
{
cutRectangle.X = x;
cutRectangle.Y = y;
editGraphics.DrawRectangle(pen, cutRectangle);
// get cut out
Image cutout = new Bitmap(cutImageSize.Width, cutImageSize.Height);
using (Graphics g = Graphics.FromImage(cutout))
{
g.DrawImage(editImage, 0, 0, cutRectangle, GraphicsUnit.Pixel);
g.Dispose();
}
// resize cut out
Image newCutout = ResizeImage(cutout, imageSize.Width, imageSize.Height);
// create full page image
Image fullPageImage = new Bitmap(selectedUnit.ToPixels(selectedFormatWidth), selectedUnit.ToPixels(selectedFormatHeight));
using (Graphics g = Graphics.FromImage(fullPageImage))
{
// make page white
g.FillRectangle(Brushes.White, 0, 0, fullPageImage.Width, fullPageImage.Height);
// draw cutout onto page
g.DrawImage(newCutout, pixelMarginSides, pixelMarginTop);
g.Dispose();
}
generatedPagesList.Add(fullPageImage);
// create thumbnail of image
Bitmap thumb = GenerateThumbnail(fullPageImage);
this.imageListPages.Images.Add(thumb);
cutout.Dispose();
newCutout.Dispose();
// fullPageImage.Dispose();
}
}
this.listViewPrintPreview.LargeImageList = this.imageListPages;
for (int j = 0; j < this.imageListPages.Images.Count; j++)
{
ListViewItem item = new ListViewItem();
item.ImageIndex = j;
this.listViewPrintPreview.Items.Add(item);
}
editGraphics.Dispose();
}