【rhino】【python】在rhino中创建名称和颜色渐变的图层

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In this blog post, we’ll explore how to generate a series of layers in Rhino with a color gradient using Python and the RhinoScriptSyntax module. This technique can be particularly useful for visualizing data that varies continuously, such as elevation maps or thermal gradients.
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Understanding RhinoScriptSyntax

rhinoscriptsyntax (often abbreviated as rs) is a module in Rhino that provides a set of functions for scripting and automating tasks within Rhino. Here are the key functions we use in our script:

  1. rs.CreateColor(r, g, b):

    • This function creates a color object from RGB values, which are integers ranging from 0 to 255.
    • Example:
      color = rs.CreateColor(255, 0, 0)  # Creates a red color
      
  2. rs.IsLayer(name):

    • This function checks if a layer with the specified name exists in the Rhino document.
    • Example:
      if rs.IsLayer("MyLayer"):
          print("Layer exists")
      
  3. rs.AddLayer(name, color):

    • This function creates a new layer with the specified name and color.
    • Example:
      rs.AddLayer("MyLayer", rs.CreateColor(0, 255, 0))  # Creates a green layer
      
  4. rs.LayerColor(name, color):

    • This function sets the color of an existing layer.
    • Example:
      rs.LayerColor("MyLayer", rs.CreateColor(255, 255, 0))  # Changes layer color to yellow
      

The Script

Let’s break down the provided script step by step:

1. Defining the Color Gradient Function

The color_gradient function generates a list of colors forming a gradient between two given colors. This is achieved by linear interpolation of the RGB values.

def color_gradient(start_color, end_color, steps):
    gradient = []
    r_step = (end_color.R - start_color.R) / (steps - 1)
    g_step = (end_color.G - start_color.G) / (steps - 1)
    b_step = (end_color.B - start_color.B) / (steps - 1)
    
    for i in range(steps):
        r = start_color.R + int(r_step * i)
        g = start_color.G + int(g_step * i)
        b = start_color.B + int(b_step * i)
        gradient.append(rs.CreateColor(r, g, b))
    
    return gradient

2. Setting Parameters

We define the elevation range and the start and end colors for our gradient.

start_elevation = 0
end_elevation = 36
elevation_gap = 2
start_color = rs.CreateColor(0, 0, 255)  # Blue
end_color = rs.CreateColor(255, 0, 0)    # Red

3. Generating Elevation Values and Color Gradient

We use the range function to generate a list of elevation values from start_elevation to end_elevation, incrementing by elevation_gap. Then, we generate the corresponding color gradient.

elevations = range(start_elevation, end_elevation + 1, elevation_gap)
colors = color_gradient(start_color, end_color, len(elevations))

4. Creating Layers with the Gradient Colors

We loop through the elevation values, creating a layer for each elevation. If the layer already exists, we update its color.

for i, elevation in enumerate(elevations):
    layer_name = "elevation_LAND{}".format(elevation)
    
    # Create the layer if it doesn't exist
    if not rs.IsLayer(layer_name):
        rs.AddLayer(layer_name, colors[i])
    else:
        # If the layer already exists, set its color
        rs.LayerColor(layer_name, colors[i])
        
print("Layers created successfully.")

Key Programming Concepts

  1. Function Definition:

    • Functions encapsulate reusable code blocks. Here, color_gradient is a function that generates a list of colors.
  2. Color Interpolation:

    • Linear interpolation is used to compute intermediate colors between the start and end colors.
  3. Looping:

    • A for loop iterates through the number of steps to generate the intermediate colors.
    • Another for loop iterates through the elevation values to create or update the layers.
  4. String Formatting:

    • The format method is used to dynamically create layer names based on the elevation values.
  5. Conditional Statements:

import rhinoscriptsyntax as rs

# Function to create a color gradient between two colors
def color_gradient(start_color, end_color, steps):
    gradient = []
    r_step = (end_color.R - start_color.R) / (steps - 1)
    g_step = (end_color.G - start_color.G) / (steps - 1)
    b_step = (end_color.B - start_color.B) / (steps - 1)
    
    for i in range(steps):
        r = start_color.R + int(r_step * i)
        g = start_color.G + int(g_step * i)
        b = start_color.B + int(b_step * i)
        gradient.append(rs.CreateColor(r, g, b))
    
    return gradient

# Parameters
start_elevation = 0
end_elevation = 36
elevation_gap = 2
start_color = rs.CreateColor(0, 0, 255)  # Blue
end_color = rs.CreateColor(255, 0, 0)    # Red

# Generate the elevation values
elevations = range(start_elevation, end_elevation + 1, elevation_gap)

# Generate the color gradient
colors = color_gradient(start_color, end_color, len(elevations))

# Create layers with gradually changing colors
for i, elevation in enumerate(elevations):
    layer_name = "elevation_LAND{}".format(elevation)
    
    # Create the layer if it doesn't exist
    if not rs.IsLayer(layer_name):
        rs.AddLayer(layer_name, colors[i])
    else:
        # If the layer already exists, set its color
        rs.LayerColor(layer_name, colors[i])
        
print("Layers created successfully.")

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