4D Surface Chart

pythondemo\surface4d.py
#!/usr/bin/python

# The ChartDirector for Python module is assumed to be in "../lib"
import sys, os
sys.path.insert(0, os.path.join(os.path.abspath(sys.path[0]), "..", "lib"))

from pychartdir import *
import math

def createChart(chartIndex) :

    # The x and y coordinates of the grid
    dataX = [-10, -9, -8, -7, -6, -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
    dataY = [-10, -9, -8, -7, -6, -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

    # The values at the grid points. In this example, we will compute the values using the formula z
    # = x * sin(y) + y * sin(x).
    dataZ = [0] * (len(dataX) * len(dataY))
    for yIndex in range(0, len(dataY)) :
        y = dataY[yIndex]
        for xIndex in range(0, len(dataX)) :
            x = dataX[xIndex]
            dataZ[yIndex * len(dataX) + xIndex] = x * math.sin(y) + y * math.sin(x)

    # Create a SurfaceChart object of size 460 x 460 pixels, with white (ffffff) background and grey
    # (888888) border.
    c = SurfaceChart(460, 460, 0xffffff, 0x888888)

    # Add a color axis at the top center of the chart, with labels at the bottom side
    cAxis = c.setColorAxis(c.getWidth() / 2, 10, Top, 250, Bottom)

    # If the color is based on the z-values, the color axis will synchronize with the z-axis. (The
    # Axis.syncAxis can be used to disable that.) Otherwise, the color axis will auto-scale
    # independently. In the latter case, we set the tick spacing to at least 20 pixels.
    cAxis.setTickDensity(20)

    # Set flat color axis style
    cAxis.setAxisBorder(Transparent, 0)

    if chartIndex == 0 :
        # The default is to use the Z values to determine the color.
        cAxis.setTitle("Color based on Z", "Arial Bold", 15)
        c.setData(dataX, dataY, dataZ)
    elif chartIndex == 1 :
        # ChartDirector supports using an extra value (called W value) to determine the color.
        cAxis.setTitle("Color based on W", "Arial Bold", 15)

        # Use random W values
        r = RanSeries(5)
        dataW = r.get2DSeries(len(dataX), len(dataY), 0.5, 9.5)
        c.setData(dataX, dataY, dataZ, dataW)
    elif chartIndex == 2 :
        # We can set the W values to the X coordinates. The color will then be determined by the X
        # coordinates.
        cAxis.setTitle("Color based on X", "Arial Bold", 15)
        colorX = [0] * len(dataZ)
        for yIndex in range(0, len(dataY)) :
            for xIndex in range(0, len(dataX)) :
                colorX[yIndex * len(dataX) + xIndex] = dataX[xIndex]
        c.setData(dataX, dataY, dataZ, colorX)
    else :
        # We can set the W values to the Y coordinates. The color will then be determined by the Y
        # coordinates.
        cAxis.setTitle("Color based on Y", "Arial Bold", 15)
        colorY = [0] * len(dataZ)
        for yIndex in range(0, len(dataY)) :
            for xIndex in range(0, len(dataX)) :
                colorY[yIndex * len(dataX) + xIndex] = dataY[yIndex]
        c.setData(dataX, dataY, dataZ, colorY)

    # Set the center of the plot region at (230, 250), and set width x depth x height to 240 x 240 x
    # 170 pixels
    c.setPlotRegion(230, 250, 240, 240, 170)

    # Set the plot region wall thichness to 3 pixels
    c.setWallThickness(3)

    # Set the elevation and rotation angles to 45 degrees
    c.setViewAngle(45, 45)

    # Set the perspective level to 20
    c.setPerspective(20)

    # Spline interpolate data to a 50 x 50 grid for a smooth surface
    c.setInterpolation(50, 50)

    # Add the axis titles
    c.xAxis().setTitle("X-Axis", "Arial Bold", 10)
    c.yAxis().setTitle("Y-Axis", "Arial Bold", 10)
    c.zAxis().setTitle("Z Axis", "Arial Bold", 10)

    # Output the chart
    c.makeChart("surface4d%s.png" % chartIndex)


createChart(0)
createChart(1)
createChart(2)
createChart(3)