protected List <IILLegendRenderer> getRenderers(ref Size labelSize)
{
List <IILLegendRenderer> ret = new List <IILLegendRenderer>();
foreach (ILGraph graph in m_panel.Graphs)
{
IILLegendRenderer rend = graph as IILLegendRenderer;
if (rend != null)
{
ret.Add(rend);
if (rend.LabelSize.Width > labelSize.Width)
{
labelSize.Width = rend.LabelSize.Width;
}
labelSize.Height += rend.LabelSize.Height;
}
}
return(ret);
}
/// <summary>
/// draw legend into opengl context
/// </summary>
/// <param name="p">rendering properties</param>
/// <param name="area">area to draw the content into, if g is null, this will be ignored also</param>
public override void Draw(ILRenderProperties p, System.Drawing.Rectangle area)
{
if (!m_visible)
{
return;
}
// handle drawing to bitmap
if (p.Graphics != null)
{
base.Draw(p, area);
return;
}
// draw to OpenGL context
if (GraphicsContext.CurrentContext == null)
{
throw new GraphicsContextException("No OpenGL GraphicsContext current is selected for the calling thread.");
}
#region set 2D projection
float[] viewport = new float[4];
GL.GetFloat(GetPName.Viewport, viewport);
GL.MatrixMode(MatrixMode.Projection);
GL.PushMatrix();
GL.LoadIdentity();
GL.Ortho(viewport[0], viewport[2], viewport[3], viewport[1], -1.0, 1.0);
GL.MatrixMode(MatrixMode.Modelview);
GL.PushMatrix();
GL.LoadIdentity();
//GL.PushAttrib(AttribMask.TextureBit | AttribMask.EnableBit | AttribMask.ColorBufferBit);
//GL.Enable(EnableCap.Texture2D);
GL.Enable(EnableCap.Blend);
GL.BlendFunc(BlendingFactorSrc.SrcAlpha, BlendingFactorDest.OneMinusSrcAlpha);
GL.Disable(EnableCap.DepthTest);
#endregion
#region draw bounding box + bg
Size labelSize = Size.Empty, boxSize = Size.Empty;
Rectangle sampleRect = Rectangle.Empty, labelRect = Rectangle.Empty;
List <IILLegendRenderer> renderer = getRenderers(ref labelSize);
// automatically size the box
boxSize.Width = m_padding.Horizontal + labelSize.Width + 30; // <- default width for sample
boxSize.Height = m_padding.Bottom + labelSize.Height + m_padding.Top * renderer.Count;
if (!m_size.IsEmpty)
{
// prefer given size, with limitations
boxSize.Width = Math.Max(boxSize.Width, m_size.Width);
boxSize.Height = Math.Max(boxSize.Height, m_size.Height);
}
Point location = Point.Empty;
if (m_location.IsEmpty)
{
int minx = m_panel.ClientSize.Width - boxSize.Width - m_border.Width * 2;
int miny = m_panel.ClientSize.Height - boxSize.Height - m_border.Width * 2;
// by default: place legend at upper right corner
location.X = m_panel.ClientSize.Width - boxSize.Width - m_panel.Padding.Right - m_border.Width * 2;
if (location.X < 0)
{
location.X = 0;
}
if (location.X > minx)
{
location.X = minx;
}
location.Y = m_panel.Padding.Top;
if (location.Y < 0)
{
location.Y = 0;
}
if (location.Y > miny)
{
location.Y = miny;
}
}
else
{
location = new Point((int)(m_location.X * (float)m_panel.ClientSize.Width)
, (int)(m_location.Y * (float)m_panel.ClientSize.Height));
}
float offsX = Math.Max(m_border.Width / 2.0f, 1.0f);
m_bgColor = Color.FromArgb((int)(m_opacity * 255), m_bgColor);
GL.Color4(m_bgColor);
GL.ShadeModel(ShadingModel.Flat);
GL.Begin(BeginMode.Quads);
GL.Vertex2(location.X + offsX, location.Y + offsX);
GL.Vertex2(location.X + boxSize.Width - offsX, location.Y + offsX);
GL.Vertex2(location.X + boxSize.Width - offsX, location.Y + boxSize.Height - offsX);
GL.Vertex2(location.X + offsX, location.Y + boxSize.Height - offsX);
GL.Vertex2(location.X + offsX, location.Y + offsX);
GL.End();
ILNumerics.Drawing.Platform.OpenGL.ILOGLPanel.SetupLineStyle(m_border);
GL.Begin(BeginMode.LineStrip);
GL.Vertex2(location.X + offsX, location.Y + offsX);
GL.Vertex2(location.X + boxSize.Width - offsX, location.Y + offsX);
GL.Vertex2(location.X + boxSize.Width - offsX, location.Y + boxSize.Height - offsX);
GL.Vertex2(location.X + offsX, location.Y + boxSize.Height - offsX);
GL.Vertex2(location.X + offsX, location.Y + offsX);
GL.End();
#endregion
sampleRect.Y = location.Y + m_padding.Top;
sampleRect.Width = boxSize.Width - 2 * m_padding.Right - labelSize.Width;
sampleRect.X = location.X + m_padding.Left;
labelRect.Y = location.Y + m_padding.Top;
labelRect.Width = labelSize.Width;
labelRect.X = sampleRect.Right + m_padding.Right;
for (int i = 0; i < renderer.Count; i++)
{
IILLegendRenderer rend = renderer[i];
sampleRect.Height = rend.LabelSize.Height;
labelRect.Height = sampleRect.Height;
try {
rend.DrawToLegend(p, sampleRect, labelRect);
} catch (Exception) {}
sampleRect.Y = sampleRect.Bottom + m_padding.Top;
labelRect.Y = sampleRect.Y;
}
#region restore previous projection
//GL.PopAttrib();
GL.MatrixMode(MatrixMode.Modelview);
GL.PopMatrix();
GL.MatrixMode(MatrixMode.Projection);
GL.PopMatrix();
#endregion
}
