//// This code is part of Document Solutions for Imaging demos.// Copyright (c) MESCIUS inc. All rights reserved.//using System;using System.IO;using System.Drawing;using GrapeCity.Documents.Imaging;
namespace DsImagingWeb.Demos{    // This sample demonstrates how to make a round clipping of a part of an image    // and render it into a GcBitmap.    public class RoundCLip    {        public GcBitmap GenerateImage(Size pixelSize, float dpi, bool opaque, string[] sampleParams = null)        {            // Note: we can use Color.Transparent instead of a solid background,            // but the resulting image format must support transparency for this            // to work as expected:            var backColor = Color.FromArgb(unchecked((int)0xff0066cc));            var foreColor = Color.FromArgb(unchecked((int)0xffffcc00));            const int bottom = 144, pad = 36;            int minSize = Math.Min(pixelSize.Width, pixelSize.Height) / 6, maxSize = (int)(Math.Min(pixelSize.Width, pixelSize.Height) / 1.5);
            // Randomize some parameters of the sample:            var rnd = Common.Util.NewRandom();
            // It is a good idea to dispose bitmaps which are no longer needed,            // so we are 'using' all bitmaps except the one returned:            using (var bmpSrc = new GcBitmap(Path.Combine("Resources", "Stock", "woman-brick-wall.jpg")))            {                // Make sure source and target opacity match:                bmpSrc.Opaque = opaque;
                // Coordinates and size of the clipping in the source image:                const int x = 143, y = 0, w = 655, h = 655;
                // Create a clipping region excluding all outside of the specified circle:                var rgn = new GrapeCity.Documents.Imaging.Region(new RectangularFigure(0, 0, bmpSrc.PixelWidth, bmpSrc.PixelHeight));                var ellipse = new EllipticFigure(x, y, w, h);                rgn.CombineWithRegion(new GrapeCity.Documents.Imaging.Region(ellipse), RegionCombineMode.Exclude, false);
                // To clip using a Region, we need to use the BitmapRenderer.                // NOTE (new in v2sp2): the renderer is not created by default,                // we must call EnsureRendererCreated() prior to using it:                bmpSrc.EnsureRendererCreated();                var renderer = bmpSrc.Renderer;                renderer.ClipRegion = rgn;                renderer.Clear(Color.Transparent);                var size = rnd.Next(minSize, maxSize);                using (var bmpRound = bmpSrc.Clip(new Rectangle(x, y, w, h)))                using (var bmpSmall = bmpRound.Resize(size, size))                {                    var bmp = new GcBitmap(pixelSize.Width, pixelSize.Height, opaque, dpi, dpi);                    bmp.Clear(Color.Transparent);                    bmp.BitBlt(bmpSmall,                        rnd.Next(pad, pixelSize.Width - pad - bmpSmall.PixelWidth),                        rnd.Next(pad, pixelSize.Height - pad - bottom - bmpSmall.PixelHeight));                    return bmp;                }            }        }    }}