- //
- // This code is part of Document Solutions for PDF demos.
- // Copyright (c) MESCIUS inc. All rights reserved.
- //
- using System;
- using System.IO;
- using System.Drawing;
- using GrapeCity.Documents.Pdf;
- using GrapeCity.Documents.Text;
- using GrapeCity.Documents.Drawing;
- namespace DsPdfWeb.Demos
- {
- // This sample demonstrates how to draw round rectangles
- // using dedicated DrawRoundRect/FillRoundRect methods.
- // It also shows how the same result may be achieved with
- // graphics paths.
- public class RoundRectangle
- {
- public int CreatePDF(Stream stream)
- {
- var doc = new GcPdfDocument();
- var page = doc.NewPage();
- var g = page.Graphics;
- var rc = Common.Util.AddNote(
- "GcPdfGraphics has dedicated methods to easily draw and fill rectangles with rounded corners. " +
- "This sample also shows how the same result may be achieved using graphics paths. " +
- "While they are not really needed for drawing round rectangles, graphics paths allow " +
- "to draw and fill arbitrary figures with complex geometries.",
- page);
- // Rounded rectangle's radii:
- float rx = 36, ry = 24;
- // Using dedicated methods to draw and fill round rectangles:
- var rEasy = new RectangleF(rc.Left, rc.Bottom + 36, 144, 72);
- g.FillRoundRect(rEasy, rx, ry, Color.PaleGreen);
- g.DrawRoundRect(rEasy, rx, ry, Color.Blue, 4);
- // Add a label:
- var tf = new TextFormat() { Font = StandardFonts.Times, FontSize = 14 };
- g.DrawString("The easy way.", tf, rEasy, TextAlignment.Center, ParagraphAlignment.Center, false);
- // Using graphics path to achieve the same result:
- var rHard = rEasy;
- rHard.Offset(0, rEasy.Height + 36);
- var path = MakeRoundRect(g, rHard, rx, ry);
- g.FillPath(path, Color.PaleVioletRed);
- g.DrawPath(path, Color.Purple, 4);
- // Add a label:
- g.DrawString("The hard way.", tf, rHard, TextAlignment.Center, ParagraphAlignment.Center, false);
- // Done:
- doc.Save(stream);
- return doc.Pages.Count;
- }
- // This method shows how to create a graphics path that may be used
- // to fill or draw arbitrary shapes on a GcGraphics.
- private static IPath MakeRoundRect(GcGraphics g, RectangleF rc, float rx, float ry)
- {
- var path = g.CreatePath();
- var sz = new SizeF(rx, ry);
- // Start from horizontal top left:
- path.BeginFigure(new PointF(rc.Left + rx, rc.Top));
- path.AddLine(new PointF(rc.Right - rx, rc.Top));
- path.AddArc(new ArcSegment() { Point = new PointF(rc.Right, rc.Top + ry), SweepDirection = SweepDirection.Clockwise, Size = sz });
- path.AddLine(new PointF(rc.Right, rc.Bottom - ry));
- path.AddArc(new ArcSegment() { Point = new PointF(rc.Right - rx, rc.Bottom), SweepDirection = SweepDirection.Clockwise, Size = sz });
- path.AddLine(new PointF(rc.Left + rx, rc.Bottom));
- path.AddArc(new ArcSegment() { Point = new PointF(rc.Left, rc.Bottom - ry), SweepDirection = SweepDirection.Clockwise, Size = sz });
- path.AddLine(new PointF(rc.Left, rc.Top + ry));
- path.AddArc(new ArcSegment() { Point = new PointF(rc.Left + rx, rc.Top), SweepDirection = SweepDirection.Clockwise, Size = sz });
- path.EndFigure(FigureEnd.Closed);
- return path;
- }
- }
- }