MultiplePlots
vtk-examples/Python/Plotting/MultiplePlots
Description¶
Display multiple plots by using viewports in a single render window.
In this case, we display two graphs side-by-side.
The difference between setting a background in the renderer and setting the chart background is shown.
Note
This example was prompted by this discussion vtk chart background shifted towards origin.
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Question
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Code¶
MultiplePlots.py
import math
# noinspection PyUnresolvedReferences
import vtkmodules.vtkInteractionStyle
# noinspection PyUnresolvedReferences
import vtkmodules.vtkRenderingContextOpenGL2
# noinspection PyUnresolvedReferences
import vtkmodules.vtkRenderingOpenGL2
from vtkmodules.vtkChartsCore import (
vtkAxis,
vtkChart,
vtkChartXY,
vtkPlotPoints
)
from vtkmodules.vtkCommonColor import vtkNamedColors
from vtkmodules.vtkCommonCore import vtkFloatArray
from vtkmodules.vtkCommonDataModel import vtkTable
from vtkmodules.vtkRenderingContext2D import (
vtkContextActor,
vtkContextScene
)
from vtkmodules.vtkRenderingCore import (
vtkRenderWindow,
vtkRenderWindowInteractor,
vtkRenderer
)
def main():
colors = vtkNamedColors()
renwin = vtkRenderWindow()
renwin.SetWindowName('MultiplePlots')
iren = vtkRenderWindowInteractor()
iren.SetRenderWindow(renwin)
# Setup the viewports
grid_dimensions_x = 2
grid_dimensions_y = 1
renderer_sz_x = 320
renderer_sz_y = 240
renwin.SetSize(renderer_sz_x * grid_dimensions_x, renderer_sz_y * grid_dimensions_y)
viewports = list()
for row in range(0, grid_dimensions_y):
for col in range(0, grid_dimensions_x):
# index = row * grid_dimensions_x + col
# (xmin, ymin, xmax, ymax)
viewports.append([float(col) / grid_dimensions_x,
float(grid_dimensions_y - (row + 1)) / grid_dimensions_y,
float(col + 1) / grid_dimensions_x,
float(grid_dimensions_y - row) / grid_dimensions_y])
# Link the renderers to the viewports.
left_renderer = vtkRenderer()
left_renderer.SetBackground(colors.GetColor3d('AliceBlue'))
left_renderer.SetViewport(viewports[0])
renwin.AddRenderer(left_renderer)
right_renderer = vtkRenderer()
right_renderer.SetBackground(colors.GetColor3d('Lavender'))
right_renderer.SetViewport(viewports[1])
renwin.AddRenderer(right_renderer)
# Create the charts.
left_chart = vtkChartXY()
left_chart_scene = vtkContextScene()
left_chart_actor = vtkContextActor()
left_chart_scene.AddItem(left_chart)
left_chart_actor.SetScene(left_chart_scene)
left_renderer.AddActor(left_chart_actor)
left_chart_scene.SetRenderer(left_renderer)
x_axis = left_chart.GetAxis(vtkAxis.BOTTOM)
x_axis.GetGridPen().SetColor(colors.GetColor4ub("LightGrey"))
x_axis.SetTitle('x')
y_axis = left_chart.GetAxis(vtkAxis.LEFT)
y_axis.GetGridPen().SetColor(colors.GetColor4ub("LightGrey"))
y_axis.SetTitle('cos(x)')
left_chart.GetBackgroundBrush().SetColorF(*colors.GetColor4d('MistyRose'))
left_chart.GetBackgroundBrush().SetOpacityF(0.4)
left_chart.SetTitle('Cosine')
right_chart = vtkChartXY()
right_chart_scene = vtkContextScene()
right_chart_actor = vtkContextActor()
right_chart_scene.AddItem(right_chart)
right_chart_actor.SetScene(right_chart_scene)
right_renderer.AddActor(right_chart_actor)
right_chart_scene.SetRenderer(right_renderer)
x_axis = right_chart.GetAxis(vtkAxis.BOTTOM)
x_axis.GetGridPen().SetColor(colors.GetColor4ub("LightCyan"))
x_axis.SetTitle('x')
y_axis = right_chart.GetAxis(vtkAxis.LEFT)
y_axis.GetGridPen().SetColor(colors.GetColor4ub("LightCyan"))
y_axis.SetTitle('sin(x)')
right_chart.GetBackgroundBrush().SetColorF(*colors.GetColor4d('Thistle'))
right_chart.GetBackgroundBrush().SetOpacityF(0.4)
right_chart.SetTitle('Sine')
# Create the data.
table = vtkTable()
array_x = vtkFloatArray()
array_x.SetName('X Axis')
table.AddColumn(array_x)
array_cos = vtkFloatArray()
array_cos.SetName('Cosine')
table.AddColumn(array_cos)
array_sin = vtkFloatArray()
array_sin.SetName('Sine')
table.AddColumn(array_sin)
# Fill in the table with some example values.
num_points = 40
inc = 7.5 / (num_points - 1.0)
table.SetNumberOfRows(num_points)
for i in range(num_points):
table.SetValue(i, 0, i * inc)
table.SetValue(i, 1, math.cos(i * inc))
table.SetValue(i, 2, math.sin(i * inc))
points = left_chart.AddPlot(vtkChart.POINTS)
points.SetInputData(table, 0, 1)
points.SetColor(*colors.GetColor4ub('Black'))
points.SetWidth(1.0)
points.SetMarkerStyle(vtkPlotPoints.CROSS)
points = right_chart.AddPlot(vtkChart.POINTS)
points.SetInputData(table, 0, 2)
points.SetColor(*colors.GetColor4ub('Black'))
points.SetWidth(1.0)
points.SetMarkerStyle(vtkPlotPoints.PLUS)
renwin.Render()
iren.Initialize()
iren.Start()
if __name__ == '__main__':
main()