public static Bitmap RenderHighlights(int width, int height, PDFDocument pdf_document, int page)
{
WPFDoEvents.AssertThisCodeIs_NOT_RunningInTheUIThread();
// Render onto a scratch image in solid
Bitmap bitmap = new Bitmap(width, height); // <--- must b Dispose()d by caller
using (Graphics graphics = Graphics.FromImage(bitmap))
{
double last_right = Double.NegativeInfinity;
double last_top = Double.NegativeInfinity;
double last_bottom = Double.NegativeInfinity;
PointF[] adjoinment_points = new PointF[4];
// TODO: next call can be very costly; MUST run in background!
var highlights = pdf_document.Highlights.GetHighlightsForPage(page);
foreach (PDFHighlight highlight in highlights)
{
using (Brush highlight_pen = new SolidBrush(StandardHighlightColours.GetColor_Drawing(highlight.Color)))
{
graphics.FillRectangle(highlight_pen, (float)(highlight.Left * width), (float)(highlight.Top * height), (float)(highlight.Width * width), (float)(highlight.Height * height));
// Do some adjoining
if (Math.Abs(last_right - highlight.Left) < highlight.Height * 0.75 && Math.Abs(last_top - highlight.Top) < highlight.Height * 0.75 && Math.Abs(last_bottom - highlight.Bottom) < highlight.Height * 0.75)
{
// 0 -- 1
// | |
// 3 -- 2
adjoinment_points[0].X = (float)(last_right * width);
adjoinment_points[0].Y = (float)(last_top * height);
adjoinment_points[1].X = (float)(highlight.Left * width);
adjoinment_points[1].Y = (float)(highlight.Top * height);
adjoinment_points[2].X = (float)(highlight.Left * width);
adjoinment_points[2].Y = (float)(highlight.Bottom * height);
adjoinment_points[3].X = (float)(last_right * width);
adjoinment_points[3].Y = (float)(last_bottom * height);
graphics.FillPolygon(highlight_pen, adjoinment_points);
}
// Remember the last position for future potential adjoining
last_right = highlight.Right;
last_top = highlight.Top;
last_bottom = highlight.Bottom;
}
}
}
return(bitmap);
}
public static Bitmap RenderHighlights(int width, int height, PDFDocument pdf_document, int page)
{
// Render onto a scratch image in solid
Bitmap bitmap = new Bitmap(width, height);
using (Graphics graphics = Graphics.FromImage(bitmap))
{
double last_right = Double.NegativeInfinity;
double last_top = Double.NegativeInfinity;
double last_bottom = Double.NegativeInfinity;
PointF[] adjoinment_points = new PointF[4];
foreach (PDFHighlight highlight in pdf_document.Highlights.GetHighlightsForPage(page))
{
Brush highlight_pen = new SolidBrush(StandardHighlightColours.GetColor_Drawing(highlight.Color));
graphics.FillRectangle(highlight_pen, (float)(highlight.Left * width), (float)(highlight.Top * height), (float)(highlight.Width * width), (float)(highlight.Height * height));
// Do some adjoining
if (Math.Abs(last_right - highlight.Left) < highlight.Height * 0.75 && Math.Abs(last_top - highlight.Top) < highlight.Height * 0.75 && Math.Abs(last_bottom - highlight.Bottom) < highlight.Height * 0.75)
{
// 0 -- 1
// | |
// 3 -- 2
adjoinment_points[0].X = (float)(last_right * width);
adjoinment_points[0].Y = (float)(last_top * height);
adjoinment_points[1].X = (float)(highlight.Left * width);
adjoinment_points[1].Y = (float)(highlight.Top * height);
adjoinment_points[2].X = (float)(highlight.Left * width);
adjoinment_points[2].Y = (float)(highlight.Bottom * height);
adjoinment_points[3].X = (float)(last_right * width);
adjoinment_points[3].Y = (float)(last_bottom * height);
graphics.FillPolygon(highlight_pen, adjoinment_points);
}
// Remember the last position for future potential adjoining
last_right = highlight.Right;
last_top = highlight.Top;
last_bottom = highlight.Bottom;
}
}
return(bitmap);
}