Creating a bar graph using a python component - Stuck on how to use meshes

Hi everyone

I am trying to create a bar graph like seen in the 1st picture below,

I am already able to create the texts and simple lines which represent the data seen in the very uneventual 2nd picture.

But what I am struggling with is how do you create what I believe are called meshes and how do you colour them. At the moment I can only create lines to represent data but I want to be able to create think bars and colour them blue.

Can anyone write the basic code structure for me?

Replies to This Discussion

Permalink Reply by Raul Matagringo on January 9, 2015 at 2:38am

Hi,

how about asigning a weight and a color to your lines?

Best,

Permalink Reply by Anton Szilasi on January 9, 2015 at 3:47am

How do I do that I cant see this method in Rhino commons

Permalink Reply by Anders Holden Deleuran on January 9, 2015 at 5:15am

The Human plugin has a component for displaying curves/lines with custom weights. If you want to script this you could use the CustomDisplay class. It can be a tricky though, having to dispose of the display and what not. I think a simpler approach would be to draw each bar as a quad mesh face and scale these meshes by their the value they represent.

Permalink Reply by Raul Matagringo on January 9, 2015 at 6:17am

I have here an snippet in C# maybe you can adapt it:

    Line my_line;
    my_line = x;

    Rhino.Display.CustomDisplay my_display = new Rhino.Display.CustomDisplay(true);
    my_display.AddLine(x, Color.Red, 10);

Cheers,

Permalink Reply by Anton Szilasi on January 13, 2015 at 7:47pm

For the future reference of anyone looking to do this its done along these lines to draw the blue bars in the graph itself

dataMeshes = []

for numseg, i in enumerate(datain): # numseg is 0 to 23 i is the data itself

planeRec = rc.Geometry.Plane.WorldXY
startPt = rc.Geometry.Point3d((width/len(datain))*numseg, 0, 0) # The point where that segment of the bar graph starts
textBasePts.append(rc.Geometry.Point3d((width/len(datain))*numseg+(width/len(datain))/2, 0,startPt.Z-width/100)) # The points where the hour of the bar graph will be placed
labelPts.append(rc.Geometry.Point3d((width/len(datain))*numseg+(width/len(datain))/2, 0,startPt.Z+(iscale*i)+width/100))

# Create the points of the mesh of the bars themselves

facePt1 = rc.Geometry.Point3d(startPt.X + width/240, startPt.Y, startPt.Z)
facePt2 = rc.Geometry.Point3d(startPt.X+ width*0.0375, startPt.Y, startPt.Z)
facePt3 = rc.Geometry.Point3d(startPt.X+ width/240, startPt.Y, startPt.Z+(iscale*i))
facePt4 = rc.Geometry.Point3d(startPt.X+ width*0.0375, startPt.Y, startPt.Z+(iscale*i))

# Create the values of each bar to display later as labels ontop of the bar graphs

labels.append(round(iscale*i,2))

# Create the mesh of the bars themselves
barMesh = rc.Geometry.Mesh()
for point in [facePt1, facePt2, facePt3, facePt4]:
barMesh.Vertices.Add(point)
barMesh.Faces.AddFace(0, 1, 3, 2)
# Color the mesh faces of the bars themselves
barMesh.VertexColors.CreateMonotoneMesh(System.Drawing.Color.Blue)

dataMeshes.append(barMesh)