RenderSvgContent.cs
- //
- // 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 System.Collections.Generic;
- using System.Linq;
- using System.Numerics;
- using GrapeCity.Documents.Drawing;
- using GrapeCity.Documents.Text;
- using GrapeCity.Documents.Imaging;
- using GrapeCity.Documents.Svg;
- using GCTEXT = GrapeCity.Documents.Text;
- using GCDRAW = GrapeCity.Documents.Drawing;
- using DsImagingWeb.Demos.Common;
-
- namespace DsImagingWeb.Demos
- {
- // This sample shows how to measure and render the actual SVG content
- // that sometimes is offset within the SVG viewport.
- // In the left part of the page, we render such an SVG as it is supposed
- // to be laid out within its viewport. A gray border is drawn around the viewport,
- // and a magenta border is around the SVG content.
- // In the right part of the page we locate just the content at a specific point
- // in the final image, and draw a purple border around it.
- //
- // This short sample shows how to measure and render an SVG image.
- // The SVG art used in this sample is from freesvg.org.
- public class RenderSvgContent
- {
- public GcBitmap GenerateImage(Size pixelSize, float dpi, bool opaque, string[] sampleParams = null)
- {
- // Load the SVG:
- var svgPath = Path.Combine("Resources", "SvgMisc", "Smiling-Girl-offset.svg");
- using var svg = GcSvgDocument.FromFile(svgPath);
-
- var bmp = new GcBitmap(pixelSize.Width, pixelSize.Height, opaque, dpi, dpi);
- using var g = bmp.CreateGraphics(Color.White);
- var pt0 = new PointF(g.Resolution, g.Resolution);
-
- // Render the SVG content as specified by the SVG layout within viewport:
- var rcViewport = new RectangleF(pt0, svg.GetIntrinsicSize(SvgLengthUnits.Pixels));
- // Measure the content size/location relative to 'pt':
- var rcContent0 = g.MeasureSvg(svg, pt0);
- // Draw the SVG and viewport and content bounds:
- g.DrawSvg(svg, pt0);
- g.DrawRectangle(rcViewport, Color.DarkGray);
- g.DrawRectangle(rcContent0, Color.Magenta);
-
- // In the left part of the bitmap, render just the SVG content
- // aligning its top left corner to a specific point on the bitmap
- // (center of page horizontally, 1" from the top):
- var pt1 = new PointF(pixelSize.Width / 2, g.Resolution);
- // An alternative to GcGraphics.MeasureSvg() is GcSvgDocument.Measure(),
- // here we use it for illustration but these methods are calculations heavy,
- // so in a real app we would re-use the results from GcGraphics.MeasureSvg() above:
- var rcContent1 = svg.Measure(PointF.Empty, dpi);
- g.DrawSvg(svg, new PointF(pt1.X - rcContent1.X, pt1.Y - rcContent1.Y));
- // Add a border:
- g.DrawRectangle(new RectangleF(pt1, rcContent1.Size), Color.Purple);
-
- // Done:
- return bmp;
- }
- }
- }
-