//
// 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 DsImagingWeb.Demos.Common;
using GCTEXT = GrapeCity.Documents.Text;
using GCDRAW = GrapeCity.Documents.Drawing;
namespace DsImagingWeb.Demos
{
// This example shows how to create an SVG from scratch,
// grouping visually related elements and assigning unique
// HTML IDs to the groups, so that each group can be found
// and manipulated from JavaScript code (e.g. some elements
// of a drawing can be hidden or shown in JavaScript, etc).
// This sample renders an arch similar to that in SvgGraphicsArch,
// but assigns separate IDs to:
// - the background;
// - the arch drawing;
// - measurements lines.
public class SvgGraphicsHtmlId
{
public string DefaultMime { get => Common.Util.MimeTypes.SVG; }
public Stream GenerateImageStream(string targetMime, Size pixelSize, float dpi, bool opaque, string[] sampleParams = null)
{
if (targetMime != Common.Util.MimeTypes.SVG)
throw new Exception("This sample only supports SVG output format.");
Color background = Color.PaleGoldenrod,
line = Color.FromArgb(11, 83, 69),
arc = Color.FromArgb(22, 160, 133),
fill = Color.FromArgb(255, 171, 145),
marks = Color.DarkGray,
text = Color.Black,
textBack = Color.Cornsilk;
var Inch = dpi;
// Text format for labels:
var tf = new TextFormat()
{
Font = GCTEXT.Font.FromFile(Path.Combine("Resources", "Fonts", "times.ttf")),
FontSize = Inch / 6,
ForeColor = text,
};
// Arc bounding rectangle:
var rc = new RectangleF(0, 0, Inch * 4, Inch * 4.8f);
// Transform to center the drawing:
var transform = Matrix3x2.CreateTranslation(pixelSize.Width / 2f - rc.Width / 2, pixelSize.Height / 2f - rc.Height / 2);
// A document for each layer:
var svgs = new List<GcSvgDocument>();
// In a loop (from 0 to 2), draw content that belongs to the desired
// current layer on a graphics, then convert that graphics to a temp GcSvgDocument
// and save it in a list:
for (int i = 0; i < 3; ++i)
{
using var g = new GcSvgGraphics(pixelSize.Width, pixelSize.Height);
if (i == 0)
{
// Background:
g.FillRectangle(new RectangleF(0, 0, g.Width, g.Height), background);
}
else if (i == 1)
{
// Arch and text label:
g.Transform = transform;
DrawArch(g, rc, rc.Height * 0.3f, rc.Width * 0.08f, line, arc, fill);
g.DrawString("ARCH", tf, rc, TextAlignment.Center, ParagraphAlignment.Center, false);
g.Transform = Matrix3x2.Identity;
}
else if (i == 2)
{
// Measurement lines:
g.Transform = transform;
var w = Inch / 8;
var pen = new GCDRAW.Pen(marks);
// Width line/label:
var txt = $"{(rc.Width / Inch):F}\"";
var s = g.MeasureString(txt, tf);
var d = s.Height * 1.5f;
g.DrawLine(rc.Left, rc.Top - d, rc.Right, rc.Top - d, pen);
g.DrawLine(rc.Left, rc.Top - d, rc.Left + w, rc.Top - d - w, pen);
g.DrawLine(rc.Left, rc.Top - d, rc.Left + w, rc.Top - d + w, pen);
g.DrawLine(rc.Right, rc.Top - d, rc.Right - w, rc.Top - d - w, pen);
g.DrawLine(rc.Right, rc.Top - d, rc.Right - w, rc.Top - d + w, pen);
var rcTxt = new RectangleF(rc.Left + rc.Width / 2 - s.Width / 2, rc.Top - d - s.Height / 2, s.Width, s.Height);
rcTxt.Inflate(2, 2);
g.FillRectangle(rcTxt, textBack);
g.DrawString(txt, tf, rcTxt, TextAlignment.Center, ParagraphAlignment.Center, false);
// Height line/label:
txt = $"{(rc.Height / Inch):F}\"";
s = g.MeasureString(txt, tf);
d = s.Width;
g.DrawLine(rc.Left - d, rc.Top, rc.Left - d, rc.Bottom, pen);
g.DrawLine(rc.Left - d, rc.Top, rc.Left - d - w, rc.Top + w, pen);
g.DrawLine(rc.Left - d, rc.Top, rc.Left - d + w, rc.Top + w, pen);
g.DrawLine(rc.Left - d, rc.Bottom, rc.Left - d - w, rc.Bottom - w, pen);
g.DrawLine(rc.Left - d, rc.Bottom, rc.Left - d + w, rc.Bottom - w, pen);
rcTxt = new RectangleF(rc.Left - d - s.Width / 2, rc.Top + rc.Height / 2 - s.Height / 2, s.Width, s.Height);
rcTxt.Inflate(2, 2);
g.FillRectangle(rcTxt, textBack);
g.DrawString(txt, tf, rcTxt, TextAlignment.Center, ParagraphAlignment.Center, false);
g.Transform = Matrix3x2.Identity;
}
// Convert the layer to a GcSvgDocument and add it to the list:
svgs.Add(g.ToSvgDocument());
}
// Create the resulting SVG, add each of the temp documents
// into a separate group with unique ID that can be used
// to find and manipulate it:
var svg = new GcSvgDocument();
for (int i = 0; i < svgs.Count; ++i)
{
var tsvg = svgs[i];
var group = new SvgGroupElement()
{
ID = $"myId{i}",
};
while (tsvg.RootSvg.Children.Count > 0)
{
var e = tsvg.RootSvg.Children[0];
tsvg.RootSvg.Children.RemoveAt(0);
group.Children.Add(e);
}
svg.RootSvg.Children.Add(group);
}
svg.RootSvg.ViewBox = new SvgViewBox(0, 0, pixelSize.Width, pixelSize.Height);
// When the resulting SVG is shown in a browser, any of the three layers
// can be found and manipulated in JavaScript using the unique ID of its group.
// For example, if you download the resulting SVG and open it in a browser,
// you can hide the background and measurement lines by running the following
// commands in the browser's console:
// document.getElementById("myId0").style.display= 'none'
// document.getElementById("myId2").style.display= 'none'
// Done:
var ms = new MemoryStream();
svg.Save(ms);
ms.Seek(0, SeekOrigin.Begin);
return ms;
}
private void DrawArch(GcGraphics g, RectangleF rc, float harc, float wd, Color line, Color arch, Color fill)
{
var path = g.CreatePath();
// Insides filler (start from bottom left, to clockwise):
path.BeginFigure(rc.Left + wd, rc.Bottom - wd);
path.AddLine(rc.Left + wd, rc.Top + harc);
path.AddArc(new ArcSegment()
{
ArcSize = ArcSize.Small,
Point = new PointF(rc.Right - wd, rc.Top + harc),
RotationAngle = 0,
Size = new SizeF(rc.Width / 2f - wd, harc - wd),
SweepDirection = SweepDirection.Clockwise
});
path.AddLine(rc.Right - wd, rc.Bottom - wd);
path.EndFigure(FigureEnd.Closed);
g.FillPath(path, fill);
path.Dispose();
// Arc outlines (start from bottom left, to clockwise):
path = g.CreatePath();
path.BeginFigure(rc.Left, rc.Bottom);
path.AddLine(rc.Left, rc.Top + harc);
path.AddLine(rc.Left + wd, rc.Top + harc);
path.AddLine(rc.Left + wd, rc.Bottom - wd);
path.EndFigure(FigureEnd.Closed);
path.BeginFigure(rc.Left, rc.Top + harc);
path.AddArc(new ArcSegment()
{
ArcSize = ArcSize.Small,
Point = new PointF(rc.Right, rc.Top + harc),
RotationAngle = 0,
Size = new SizeF(rc.Width / 2f, harc),
SweepDirection = SweepDirection.Clockwise
});
path.AddLine(rc.Right - wd, rc.Top + harc);
path.AddArc(new ArcSegment()
{
ArcSize = ArcSize.Small,
Point = new PointF(rc.Left + wd, rc.Top + harc),
RotationAngle = 0,
Size = new SizeF(rc.Width / 2f - wd, harc - wd),
SweepDirection = SweepDirection.CounterClockwise
});
path.EndFigure(FigureEnd.Closed);
path.BeginFigure(rc.Right, rc.Top + harc);
path.AddLine(rc.Right, rc.Bottom);
path.AddLine(rc.Right - wd, rc.Bottom - wd);
path.AddLine(rc.Right - wd, rc.Top + harc);
path.EndFigure(FigureEnd.Closed);
path.BeginFigure(rc.Right, rc.Bottom);
path.AddLine(rc.Left, rc.Bottom);
path.AddLine(rc.Left + wd, rc.Bottom - wd);
path.AddLine(rc.Right - wd, rc.Bottom - wd);
path.EndFigure(FigureEnd.Closed);
g.FillPath(path, arch);
g.DrawPath(path, new GCDRAW.Pen(line, 2));
path.Dispose();
}
}
}