Transforms.cs
// 完毕:
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
{
// 演示如何使用图形转换(GcPdfGraphics.Transform 属性)。
public class Transforms
{
// 辅助方法绘制一个带有文本的填充框:
private static void DrawBox(string text, GcGraphics g, RectangleF box)
{
g.FillRectangle(box, Color.FromArgb(80, 0, 184, 204));
g.DrawRectangle(box, Color.FromArgb(0, 193, 213), 1);
box.Inflate(-6, -6);
g.DrawString(text, new TextFormat() { Font = StandardFonts.Times, FontSize = 14, }, box);
}
public int CreatePDF(Stream stream)
{
const string baseTxt = "Text drawn at (0,36) in a 4\"x2\" box";
var doc = new GcPdfDocument();
var page = doc.NewPage();
var g = page.Graphics;
var box = new RectangleF(0, 36, 72 * 4, 72 * 2);
// #1:
DrawBox($"Box 1: {baseTxt}, no transformations.", g, box);
//
var translate0 = Matrix3x2.CreateTranslation(72 * 1, 72 * 4);
var scale0 = Matrix3x2.CreateScale(0.5f);
// 变换按从最后到第一个的顺序应用。
// #2:
g.Transform =
scale0 *
translate0;
DrawBox($"Box 2: {baseTxt}, translated by (1\",4\") and scaled by 0.5.", g, box);
// #3:
g.Transform =
translate0 *
scale0;
DrawBox($"Box 3: {baseTxt}, scaled by 0.5 and translated by (1\",4\").", g, box);
//
var translate1 = Matrix3x2.CreateTranslation(72 * 3, 72 * 5);
var scale1 = Matrix3x2.CreateScale(0.7f);
var rotate0 = Matrix3x2.CreateRotation((float)(-70 * Math.PI) / 180f); // 70 degrees CCW
// #4:
g.Transform =
rotate0 *
translate1 *
scale1;
DrawBox($"Box 4: {baseTxt}, scaled by 0.7, translated by (3\",5\"), and rotated 70 degrees counterclockwise.", g, box);
// #5:
g.Transform =
Matrix3x2.CreateTranslation(36, 72) *
g.Transform;
DrawBox($"Box 5: {baseTxt}, applied current transform (Box 4), and translated by (1/2\",1\").", g, box);
// #6:
g.Transform =
// rotate0 *
Matrix3x2.CreateSkew((float)(-45 * Math.PI) / 180f, (float)(20 * Math.PI) / 180f) *
Matrix3x2.CreateTranslation(72 * 3, 72 * 7);
DrawBox($"Box 6: {baseTxt}, translated by (3\",7\"), and skewed -45 degrees on axis X and 20 degrees on axis Y.", g, box);
// #7:
g.Transform =
Matrix3x2.CreateRotation((float)Math.PI) *
Matrix3x2.CreateTranslation(page.Size.Width - 72, page.Size.Height - 72);
DrawBox($"Box 7: {baseTxt}, translated by (7.5\",10\"), and rotated by 180 degrees.", g, box);
// 我们可以像这样删除图形上的任何转换:
g.Transform = Matrix3x2.Identity;
// 完毕:
doc.Save(stream);
return doc.Pages.Count;
}
}
}