Display Legend on viewport

Grasshopper Developer
1

Hi everyone,

I want to draw Legend on the viewport scripting C#.
Here is my image which is what I want to do.

image
image1349×741 86.8 KB

I want to make Legend’s color depend on the value which my component calculates.
And Legends will not be moved even when I panned and rotate viewport.

I’ve already draw 3Dtext using DrawViewportMeshes.
I think what I want is something to do with DrawViewportmeshes, but I couldn’t find how to get viewport coordinete.

Would there be any way to do this?

Best,
Shimpei

2

I found Draw2dRectangle class.
I guess this will be useful for me to draw legend.
Thanks!

3

Hi @11194,

DisplayPipeline.DrawBitmap might be what you need.

– Dale

4

Hi Dale,
Thank you for the reply!
Sorry for my late.

I made component displaying legend on viewport with using Draw2d, but It’s location looks bad…

button
button1464×683 30.4 KB 

int start = 400;
int length = 400;
for(int j = 0;j < div;j++){
Rectangle rec = new Rectangle(0, length / div * j + start, 50, length / div);
}

I forcibly modified ‘start’ and ‘length’ to adjust rectangle location every single time.

Do you know how to get position of corner at lower left on viewport?

Best,
Shimpei

5

Hi @11194,

Use RhinoViewport.GetScreenPort.

– Dale

6

Hi Shimpei, I’m interesting in this topic. And can you show your codes about this display legend on viewport. very thanks!

7 
private void RunScript(bool show, int width, int height)
{
  if (_conduit == null)
    _conduit = new DrawLegendConduit();
  var gradiant = Grasshopper.GUI.Gradient.GH_Gradient.Heat();
  
var legend = new Bitmap(width, height);
  for(var x = 1; x < width; x++)
      for(var y = 1; y < height; y++)
        legend.SetPixel(x, y, gradiant.ColourAt((double) y / height));

  _conduit.Legend = legend;
  _conduit.Enabled = show;
  doc.Views.Redraw();
}

// <Custom additional code> 
private DrawLegendConduit _conduit;
private class DrawLegendConduit : DisplayConduit
{
  public Bitmap Legend;
  protected override void DrawForeground(DrawEventArgs e)
  {
    e.Display.DrawBitmap(new DisplayBitmap(Legend), 50, 50);
  }
}
// </Custom additional code>

Conduits.gh (3.2 KB)

8

thank you very much!