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

namespace DsPdfWeb.Demos.Basics
{
    // 演示如何在 GcDocs.Pdf 中更改页面大小和方向。
    public class PageSize
    {
        public int CreatePDF(Stream stream)
        {
            const float in2mm = 72f / 25.4f;
            var colorOrig = Color.Red;
            var colorNew = Color.Blue;
            var doc = new GcPdfDocument();
            // 默认页面尺寸为 Letter (8 1/2" x 11")，纵向：
            var page = doc.NewPage();
            var sOrigPageInfo = $"Original page size: {page.Size} pts ({page.Size.Width / 72f}\" * {page.Size.Height / 72f}\"),\r\n" +
                $"paper kind: {page.PaperKind}, landscape: {page.Landscape}.";
            // 保存原始页面边界：
            var rOrig = page.Bounds;
            // 更改页面参数：
            page.Landscape = true;
            page.PaperKind = PaperKind.A4;
            var sNewPageInfo = $"New page size: {page.Size} pts ({page.Size.Width / in2mm}mm * {page.Size.Height / in2mm}mm),\r\n" +
                $"paper kind: {page.PaperKind}, landscape: {page.Landscape}.";
            // 新页面边界：
            var rNew = page.Bounds;
            // 绘制原始页面边界和新页面边界：
            page.Graphics.DrawRectangle(rOrig, colorOrig, 6);
            page.Graphics.DrawRectangle(rNew, colorNew, 6);
            // 绘制原始和新的页面信息：
            var tf = new TextFormat()
            {
                Font = StandardFonts.Times,
                FontSize = 14,
                ForeColor = colorOrig
            };
            page.Graphics.DrawString(sOrigPageInfo, tf, new PointF(72, 72));
            tf.ForeColor = colorNew;
            page.Graphics.DrawString(sNewPageInfo, tf, new PointF(72, 72 * 2));
            // 完毕：
            doc.Save(stream);
            return doc.Pages.Count;
        }
    }
}