// 完毕：
using System;
using System.IO;
using System.Drawing;
using GrapeCity.Documents.Pdf;
using GrapeCity.Documents.Text;
using GrapeCity.Documents.Drawing;

namespace DsPdfWeb.Demos
{
    // 该示例演示了如何绘制圆角矩形
    // 使用专用的 DrawRoundRect/FillRoundRect 方法。
    // 它还显示了如何实现相同的结果
    // 图形路径。
    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 有专门的方法可以轻松绘制和填充圆角矩形。" +
                "",
                page);

            // 圆角矩形的半径：
            float rx = 36, ry = 24;

            // 使用专用方法绘制和填充圆角矩形：
            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);
            // 添加标签：
            var tf = new TextFormat() { Font = StandardFonts.Times, FontSize = 14 };
            g.DrawString("最简单的方法。", tf, rEasy, TextAlignment.Center, ParagraphAlignment.Center, false);

            // 使用图形路径达到相同的结果：
            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);
            // 添加标签：
            g.DrawString("艰难的方式。", tf, rHard, TextAlignment.Center, ParagraphAlignment.Center, false);

            // 完毕：
            doc.Save(stream);
            return doc.Pages.Count;
        }

        // 该方法展示了如何创建可能使用的图形路径
        // 在 GcGraphics 上填充或绘制任意形状。
        private static IPath MakeRoundRect(GcGraphics g, RectangleF rc, float rx, float ry)
        {
            var path = g.CreatePath();
            var sz = new SizeF(rx, ry);
            // 从水平左上角开始：
            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;
        }
    }
}