PurplePen.MapDisplay.DrawHelper C# (CSharp) Method

        private void DrawHelper(IGraphicsTarget grTargetOcadMap, IGraphicsTarget grTargetBitmapMap, IGraphicsTarget grTargetCourses, RectangleF visRect, float minResolution)
        {
            RenderOptions renderOptions = new RenderOptions();
            renderOptions.minResolution = minResolution;

            if (Printing)
                renderOptions.usePatternBitmaps = false;   // don't use pattern bitmaps when printing, they cause some problems in some printer drivers and we want best quality.
            else if (antialiased && minResolution < 0.007F)  // use pattern bitmaps unless high quality and zoomed in very far
                renderOptions.usePatternBitmaps = false;
            else
                renderOptions.usePatternBitmaps = true;

            renderOptions.showSymbolBounds = showBounds;
            renderOptions.renderTemplates = RenderTemplateOption.MapAndTemplates;
            renderOptions.blendOverprintedColors = ocadOverprintEffect;

            // First draw the real map.
            switch (mapType) {
            case MapType.OCAD:
                grTargetOcadMap.PushAntiAliasing(Printing ? false : antialiased);       // don't anti-alias on printer
                DrawOcadMap(grTargetOcadMap, visRect, renderOptions);
                grTargetOcadMap.PopAntiAliasing();
                break;

            case MapType.Bitmap:
            case MapType.PDF:
                grTargetBitmapMap.PushAntiAliasing(Printing ? false : antialiased);       // don't anti-alias on printer
                DrawBitmapMap(grTargetBitmapMap, visRect, minResolution);
                grTargetBitmapMap.PopAntiAliasing();
                break;

            case MapType.None:
                break;
            }

            // Now draw the courseMap on top.
            if (Printing)
                grTargetCourses.PushAntiAliasing(false);
            else
                grTargetCourses.PushAntiAliasing(true);   // always anti-alias the course unless printing

            // Always turn blending on.
            renderOptions.blendOverprintedColors = true;

            if (courseMap != null) {
                using (courseMap.Read())
                    courseMap.Draw(grTargetCourses, visRect, renderOptions, null);
            }

            grTargetCourses.PopAntiAliasing();

            grTargetCourses.PushAntiAliasing(false);

            if (printArea.HasValue && !printArea.Value.Contains(visRect)) {
                object printAreaOutline = new object();

                grTargetCourses.CreateSolidBrush(printAreaOutline, CmykColor.FromCmyka(0, 0, 0, 1, 0.12F));
                if (printArea.Value.Top > visRect.Top) {
                    RectangleF draw = RectangleF.FromLTRB(visRect.Left, visRect.Top, visRect.Right, printArea.Value.Top);
                    grTargetCourses.FillRectangle(printAreaOutline, draw);
                }
                if (printArea.Value.Bottom < visRect.Bottom) {
                    RectangleF draw = RectangleF.FromLTRB(visRect.Left, printArea.Value.Bottom, visRect.Right, visRect.Bottom);
                    grTargetCourses.FillRectangle(printAreaOutline, draw);
                }
                if (printArea.Value.Left > visRect.Left) {
                    RectangleF draw = RectangleF.FromLTRB(visRect.Left, printArea.Value.Top, printArea.Value.Left, printArea.Value.Bottom);
                    grTargetCourses.FillRectangle(printAreaOutline, draw);
                }
                if (printArea.Value.Right < visRect.Right) {
                    RectangleF draw = RectangleF.FromLTRB(printArea.Value.Right, printArea.Value.Top, visRect.Right, printArea.Value.Bottom);
                    grTargetCourses.FillRectangle(printAreaOutline, draw);
                }
            }

            grTargetCourses.PopAntiAliasing();
        }