// // 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; using GCTEXT = GrapeCity.Documents.Text; using GCDRAW = GrapeCity.Documents.Drawing; namespace DsPdfWeb.Demos.Basics { // This sample shows how to create gradient fills // using LinearGradientBrush and RadialGradientBrush. public class Gradients { public int CreatePDF(Stream stream) { var doc = new GcPdfDocument(); var g = doc.NewPage().Graphics; var testRectSize = new SizeF(72 * 4, 72); var dy = 12; // TextLayout to draw labels: var tl = g.CreateTextLayout(); tl.DefaultFormat.Font = StandardFonts.Times; tl.DefaultFormat.FontSize = 18; tl.DefaultFormat.ForeColor = Color.Chartreuse; tl.MaxWidth = testRectSize.Width; tl.MaxHeight = testRectSize.Height; tl.TextAlignment = TextAlignment.Center; tl.ParagraphAlignment = ParagraphAlignment.Center; // Note 1: var rc = Common.Util.AddNote("Linear gradients using LinearGradientBrush:", doc.Pages.Last, new RectangleF(72, 36, 500, 100)); // Text insertion point: var ip = new PointF(rc.Left, rc.Bottom + dy); // Local action to draw a gradient-filled rectangle: Action<GCDRAW.Brush, string> drawSwatch = (b_, txt_) => { var rect = new RectangleF(ip, testRectSize); // Fill the rectangle with a gradient brush: g.FillRectangle(rect, b_); // Draw a border, text info etc: g.DrawRectangle(rect, Color.Magenta); tl.Clear(); tl.Append(txt_); tl.MaxHeight = testRectSize.Height; tl.MaxWidth = testRectSize.Width; tl.PerformLayout(true); g.DrawTextLayout(tl, ip); ip.Y += rect.Height + dy; }; // LinearGradientBrush: // Horizontal gradient: var linearGradBrush = new LinearGradientBrush(Color.Red, Color.Blue); drawSwatch(linearGradBrush, $"Linear gradient\nfrom {linearGradBrush.StartPoint} to {linearGradBrush.EndPoint}"); // Vertical gradient: linearGradBrush = new LinearGradientBrush(Color.Red, new PointF(0, 0), Color.Green, new PointF(0, 1)); drawSwatch(linearGradBrush, $"Linear gradient\r\nfrom {linearGradBrush.StartPoint} to {linearGradBrush.EndPoint}"); // Diagonal gradient (increase swatch height to better show diagonal): testRectSize.Height *= 2; linearGradBrush = new LinearGradientBrush(Color.Red, new PointF(0, 0), Color.Teal, new PointF(1, 1)); drawSwatch(linearGradBrush, $"Linear gradient\r\nfrom {linearGradBrush.StartPoint} to {linearGradBrush.EndPoint}"); // RadialGradientBrush rc = Common.Util.AddNote("Radial gradients using RadialGradientBrush:", doc.Pages.Last, new RectangleF(ip, new SizeF(500, 100))); ip.Y = rc.Bottom + dy; // Centered: var radialGradBrush = new RadialGradientBrush(Color.Orange, Color.Purple); drawSwatch(radialGradBrush, $"Radial gradient\r\nwith origin at {radialGradBrush.GradientOrigin}"); // Center in bottom right corner: radialGradBrush = new RadialGradientBrush(Color.OrangeRed, Color.DarkBlue, new PointF(1, 1)); drawSwatch(radialGradBrush, $"Radial gradient\r\nwith origin at {radialGradBrush.GradientOrigin}"); // Done: doc.Save(stream); return doc.Pages.Count; } } }