コード例 #1
0
        /// <summary>
        /// Renders the polygon to a bitmap.
        /// </summary>
        /// <param name="poly">The polygon.</param>
        /// <param name="width">The desired width (pixel) of the image.</param>
        /// <returns>The bitmap.</returns>
        /// <remarks>
        /// The width has to be at least 2 * sqrt(n), n the number of vertices.
        /// Otherwise, an empty bitmap
        /// </remarks>
        public Bitmap Render(Geometry.IPolygon poly, int width = 800)
        {
            Bitmap bitmap;

            // Check if the specified width is reasonable
            if (width < 2 * Math.Sqrt(poly.Points.Count))
            {
                return(new Bitmap(1, 1));
            }

            var bounds = poly.Bounds();

            // World margin on each side
            float margin = (float)bounds.Height * 0.05f;
            float scale  = width / ((float)bounds.Width + 2 * margin);

            var target = new Rectangle(0, 0, width, (int)((bounds.Height + 2 * margin) * scale));

            bitmap = new Bitmap(width, target.Height, PixelFormat.Format32bppPArgb);

            using (var g = Graphics.FromImage(bitmap))
            {
                g.Clear(colors.Background);
                g.SmoothingMode = SmoothingMode.HighQuality;

                var context = new RenderContext(new Projection(target), colors);
                context.Add(poly);

                if (!EnablePoints)
                {
                    context.Enable(3, false);
                }

                var renderer = new LayerRenderer();
                renderer.Context      = context;
                renderer.RenderTarget = g;
                renderer.Render();
            }

            return(bitmap);
        }