// // 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 System.Numerics; using GrapeCity.Documents.Drawing; using GrapeCity.Documents.Pdf; using GrapeCity.Documents.Text; namespace DsPdfWeb.Demos.Basics { // Shows how to use GcPdfGraphics.Transform to rotate a text string // (alternative way using matrix multiplication). // See also RotatedText. public class RotatedText2 { public int CreatePDF(Stream stream) { // Rotation angle, degrees clockwise: float angle = -45; // var doc = new GcPdfDocument(); var g = doc.NewPage().Graphics; // Create a text layout, pick a font and font size: TextLayout tl = g.CreateTextLayout(); tl.DefaultFormat.Font = StandardFonts.Times; tl.DefaultFormat.FontSize = 24; // Add a text, and perform layout: tl.Append("Rotated text."); tl.PerformLayout(true); // Text insertion point at (1",1"): var ip = new PointF(72, 72); // Now that we have text size, create text rectangle with top left at insertion point: var rect = new RectangleF(ip.X, ip.Y, tl.ContentWidth, tl.ContentHeight); // Rotation center point in the middel of text bounding rectangle: var center = new PointF(ip.X + tl.ContentWidth / 2, ip.Y + tl.ContentHeight / 2); // Transformations can be combined by multiplying matrices. // Note that matrix multiplication is not commutative - // the sequence of operands is important, and is applied from last to first // matrices being multiplied: // 3) Translate the origin back to (0,0): // 2) Rotate around new origin by the specified angle: // 1) Translate the origin from default (0,0) to rotation center: g.Transform = Matrix3x2.CreateTranslation(-center.X, -center.Y) * Matrix3x2.CreateRotation((float)(angle * Math.PI) / 180f) * Matrix3x2.CreateTranslation(center.X, center.Y); // Draw rotated text and bounding rectangle: g.DrawTextLayout(tl, ip); g.DrawRectangle(rect, Color.Black, 1); // Remove transformation and draw the bounding rectangle where the non-rotated text would have been: g.Transform = Matrix3x2.Identity; g.DrawRectangle(rect, Color.ForestGreen, 1); // Done: doc.Save(stream); return doc.Pages.Count; } } }