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exporting plot to png.
This discussion was imported from CodePlex
vdepa wrote at 2012-03-02 12:13:
Hi all,
Can anyone please share code for exporting plot to png from the step onwards.
It's very urgent to me.
Please help.
ffiala wrote at 2012-03-02 22:40:
This is my file "BitmapRenderContext.cs" which is originally copied from SvgRenderContext.cs substituting the calls to svg writer through calls to Graphic class. This Class returns a Bitmap.
// --------------------------------------------------------------------------------------------------------------------
//
// http://oxyplot.codeplex.com, license: Ms-PL
//
// --------------------------------------------------------------------------------------------------------------------
namespace OxyPlot
{
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Text;
///
/// The Bitmap render context.
///
public class BitmapRenderContext : RenderContextBase, IDisposable
{
#region Constants and Fields
public Bitmap objBmpImage;
Graphics objGraphics;
#endregion
#region Constructors and Destructors
///
/// Initializes a new instance of the class.
///
/// <param name="s" />
/// The s.
///
/// <param name="width" />
/// The width.
///
/// <param name="height" />
/// The height.
///
/// <param name="isDocument" />
/// The is document.
///
public BitmapRenderContext(double width, double height)
{
this.Width = width;
this.Height = height;
this.PaintBackground = true;
objBmpImage = new Bitmap((int)width, (int)height);
objGraphics = Graphics.FromImage(objBmpImage);
objGraphics.Clear(Color.White);
objGraphics.SmoothingMode = SmoothingMode.AntiAlias;
objGraphics.TextRenderingHint = TextRenderingHint.AntiAlias;
}
#if !METRO
///
/// Initializes a new instance of the class.
///
/// <param name="path" />
/// The path.
///
/// <param name="width" />
/// The width.
///
/// <param name="height" />
/// The height.
///
public BitmapRenderContext(string path, double width, double height)
{
}
#endif
#endregion
#region Public Methods
///
/// The close.
///
public void Close()
{
}
///
/// The complete.
///
public void Complete()
{
}
///
/// The dispose.
///
public void Dispose()
{
objBmpImage.Dispose();
}
///
/// The draw ellipse.
///
/// <param name="rect" />
/// The rect.
///
/// <param name="fill" />
/// The fill.
///
/// <param name="stroke" />
/// The stroke.
///
/// <param name="thickness" />
/// The thickness.
///
public override void DrawEllipse(OxyRect rect, OxyColor fill, OxyColor stroke, double thickness)
{
Pen pen = stroke == null ? null : new Pen(Color.FromArgb(stroke.A, stroke.R, stroke.G, stroke.B), (int)thickness);
Rectangle grect = new Rectangle((int)rect.Left, (int)rect.Top, (int)rect.Width, (int)rect.Height);
SolidBrush brush = fill == null ? null : new SolidBrush(Color.FromArgb(fill.A, fill.R, fill.G, fill.B));
if (pen != null) objGraphics.DrawEllipse(pen, grect);
if (brush != null) objGraphics.FillEllipse(brush, grect);
}
///
/// The draw line.
///
/// <param name="points" />
/// The points.
///
/// <param name="stroke" />
/// The stroke.
///
/// <param name="thickness" />
/// The thickness.
///
/// <param name="dashArray" />
/// The dash array.
///
/// <param name="lineJoin" />
/// The line join.
///
/// <param name="aliased" />
/// The aliased.
///
public override void DrawLine(
IList points,
OxyColor stroke,
double thickness,
double[] dashArray,
OxyPenLineJoin lineJoin,
bool aliased)
{
Point[] Gpoints = new Point[points.Count];
for (int i=0; i
/// The draw polygon.
///
/// <param name="points" />
/// The points.
///
/// <param name="fill" />
/// The fill.
///
/// <param name="stroke" />
/// The stroke.
///
/// <param name="thickness" />
/// The thickness.
///
/// <param name="dashArray" />
/// The dash array.
///
/// <param name="lineJoin" />
/// The line join.
///
/// <param name="aliased" />
/// The aliased.
///
public override void DrawPolygon(
IList points,
OxyColor fill,
OxyColor stroke,
double thickness,
double[] dashArray,
OxyPenLineJoin lineJoin,
bool aliased)
{
Point[] Gpoints = new Point[points.Count];
for (int i = 0; i < points.Count; i++)
{
Gpoints[i].X = (int)points[i].X;
Gpoints[i].Y = (int)points[i].Y;
}
Pen pen = stroke == null ? null : new Pen(Color.FromArgb(stroke.A, stroke.R, stroke.G, stroke.B), (int)thickness);
if (pen != null) objGraphics.DrawPolygon(pen, Gpoints);
SolidBrush brush = fill == null ? null : new SolidBrush(Color.FromArgb(fill.A, fill.R, fill.G, fill.B));
if (brush != null) objGraphics.FillPolygon(brush, Gpoints);
}
///
/// The draw rectangle.
///
/// <param name="rect" />
/// The rect.
///
/// <param name="fill" />
/// The fill.
///
/// <param name="stroke" />
/// The stroke.
///
/// <param name="thickness" />
/// The thickness.
///
public override void DrawRectangle(OxyRect rect, OxyColor fill, OxyColor stroke, double thickness)
{
Pen pen = stroke==null ? null : new Pen(Color.FromArgb(stroke.A,stroke.R,stroke.G,stroke.B), (int)thickness);
Rectangle grect = new Rectangle((int)rect.Left, (int)rect.Top, (int)rect.Width, (int)rect.Height);
SolidBrush brush = fill == null ? null : new SolidBrush(Color.FromArgb(fill.A, fill.R, fill.G, fill.B));
if (pen!=null) objGraphics.DrawRectangle(pen, grect);
if (brush != null) objGraphics.FillRectangle(brush, grect);
}
///
/// The draw text.
///
/// <param name="p" />
/// The p.
///
/// <param name="text" />
/// The text.
///
/// <param name="c" />
/// The c.
///
/// <param name="fontFamily" />
/// The font family.
///
/// <param name="fontSize" />
/// The font size.
///
/// <param name="fontWeight" />
/// The font weight.
///
/// <param name="rotate" />
/// The rotate.
///
/// <param name="halign" />
/// The halign.
///
/// <param name="valign" />
/// The valign.
///
/// <param name="maxSize" />
/// Max size of the text (clipping rectangle).
///
public override void DrawText(
ScreenPoint p,
string text,
OxyColor c,
string fontFamily,
double fontSize,
double fontWeight,
double rotate,
HorizontalTextAlign halign,
VerticalTextAlign valign,
OxySize? maxSize)
{
double SizeCorrectingFactor = 0.8;
double VerticalCorrectingFactor = fontSize * 0.3;
Point Gp = new Point((int)(p.X-VerticalCorrectingFactor), (int)(p.Y));
Font font = new Font(fontFamily,(float)(fontSize*SizeCorrectingFactor), FontStyle.Regular);
SolidBrush brush = c == null ? null : new SolidBrush(Color.FromArgb(c.A, c.R, c.G, c.B));
StringFormat stringFormat = new StringFormat();
/* dont know how to vertically align text, so this setting is skipped */
if (brush != null)
{
if (Math.Abs(rotate) < 0.1)
{
switch (halign)
{
case HorizontalTextAlign.Center:
stringFormat.Alignment = StringAlignment.Center;
break;
case HorizontalTextAlign.Left:
stringFormat.Alignment = StringAlignment.Near;
break;
case HorizontalTextAlign.Right:
stringFormat.Alignment = StringAlignment.Far;
break;
}
objGraphics.DrawString(text, font, brush, Gp, stringFormat);
}
else
{
switch (halign)
{
case HorizontalTextAlign.Center:
stringFormat.Alignment = StringAlignment.Center;
break;
case HorizontalTextAlign.Left:
stringFormat.Alignment = StringAlignment.Near;
break;
case HorizontalTextAlign.Right:
stringFormat.Alignment = StringAlignment.Far;
break;
}
stringFormat.Alignment = StringAlignment.Far;
SizeF size = objGraphics.MeasureString(text, font);
Bitmap tempImage = new Bitmap((int)(size.Height * 1.2), (int)(size.Width * 1.2));
Graphics tempGraphics = Graphics.FromImage(tempImage);
tempGraphics.TextRenderingHint = TextRenderingHint.AntiAlias;
tempGraphics.SmoothingMode = SmoothingMode.AntiAlias;
Rectangle rect = new Rectangle((int)tempGraphics.VisibleClipBounds.X, (int)tempGraphics.VisibleClipBounds.Y, (int)tempGraphics.VisibleClipBounds.Width, (int)tempGraphics.VisibleClipBounds.Height);
tempGraphics.TranslateTransform(0, 0);
tempGraphics.RotateTransform(270);
tempGraphics.DrawString(text, font, brush, new PointF(0, 0), stringFormat);
objGraphics.DrawImage(tempImage, Gp);
objGraphics.DrawImage(tempImage, Gp);
tempGraphics.Dispose();
tempImage.Dispose();
}
}
}
///
/// The flush.
///
public void Flush()
{
objGraphics.Flush();
}
///
/// The measure text.
///
/// <param name="text" />
/// The text.
///
/// <param name="fontFamily" />
/// The font family.
///
/// <param name="fontSize" />
/// The font size.
///
/// <param name="fontWeight" />
/// The font weight.
///
///
///
public override OxySize MeasureText(string text, string fontFamily, double fontSize, double fontWeight)
{
if (string.IsNullOrEmpty(text))
{
return OxySize.Empty;
}
// todo: should improve text measuring, currently using p/invoke on GDI32
// is it better to use winforms or wpf text measuring?
return Gdi32.MeasureString(fontFamily, (int)fontSize, (int)fontWeight, text);
}
#endregion
}
}
In PlotModel.cs the following method is added:
///
/// Create a Drawing
///
/// <param name="width" />
/// The width.
///
/// <param name="height" />
/// The height.
///
/// <param name="isDocument" />
/// if set to true [is document].
///
///
/// The to svg.
///
public Bitmap ToBitmap(double width, double height)
{
var bmrc = new BitmapRenderContext(width, height);
this.Update();
this.Render(bmrc);
bmrc.Complete();
bmrc.Flush();
return (bmrc.objBmpImage);
}
To send the image to the client:
Response.Clear(); Response.ContentType = "image/png"; Bitmap bmp = plot.GetBitmap(800, 500); bmp.Save(Response.OutputStream, ImageFormat.Png);
In this version only solid lines are rendered.
Franz
vdepa wrote at 2012-03-06 19:06:
Hi fmoses,
I am unable to save the png. The above code is not working at the draw line.
I writting the below sample code for testing. I have used plot model and plot as in the example
Can you please correct the mistake in the below code. XAML Code:
C# Code :
using OxyPlot;
using OxyPlot.Wpf;
try
{
InitializeComponent(); Model = TwoLineSeries();
DataContext = this; Plot objPlot = this.plot1;
var path = GetFilename(".png files|*.png", ".png");
if (path != null) { objPlot.SaveBitmap(path); } } catch (Exception ex) { string abc = ex.Message.ToString(); }
public static PlotModel TwoLineSeries()
{
var model = new PlotModel();
OxyPlot.LinearAxis abcd = new OxyPlot.LinearAxis();
abcd.Key = "Hours";
abcd.Position = AxisPosition.Left;
abcd.Title = "Hours";
abcd.MajorGridlineStyle = LineStyle.Solid;
model.Axes.Add(abcd);
OxyPlot.LinearAxis abc = new OxyPlot.LinearAxis();
abc.Key = "Men";
abc.Position = AxisPosition.Bottom;
abc.Title = "Men"; model.Axes.Add(abc);
var s1 = new OxyPlot.LineSeries("Series 1")
{
Color = OxyColors.SkyBlue, };
s1.YAxisKey = abcd.Key; for (int i = 0; i < 300; i++)
{
s1.Points.Add(new DataPoint(i, i + 10));
}
model.LegendPlacement = LegendPlacement.Outside;
model.LegendOrientation = LegendOrientation.Horizontal;
return model;
Please help me.
Thanks & Regards
vdepa
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