Surface Texture

pythondemo\surfacetexture.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 *

# Use a bubble chart as the surface texture
def addBubbleTexture(sc) :
    # Set the original surface color to be from grey (0xbbbbbb) to light grey (0xeeeeee) based on
    # the z-value. This will become the background color of the surface.
    sc.colorAxis().setColorGradient(1, [0xbbbbbb, 0xeeeeee])

    # The data values for the red bubbles
    dataX0 = [-5, -2, 1, 7]
    dataY0 = [2, 4, -2, -6]
    dataZ0 = [20, 60, 50, 85]

    # The data values for the blue bubbles
    dataX1 = [5, -5, -3]
    dataY1 = [3, -4, 7]
    dataZ1 = [100, 85, 95]

    # Create a bubble chart of the same size as the surface XY size
    c = XYChart(sc.getPlotRegionWidth(), sc.getPlotRegionDepth(), Transparent)
    c.setPlotArea(0, 0, c.getWidth(), c.getHeight(), -1, -1, Transparent, Transparent)

    # Synchronize the bubble chart axis scale to the surface axis scale. As the surface axes are
    # visible, we can hide the bubble chart axes.
    c.yAxis().syncAxis(sc.yAxis())
    c.xAxis().syncAxis(sc.xAxis())
    c.xAxis().setColors(Transparent)
    c.yAxis().setColors(Transparent)

    # Add bubbles with the semi-transparent red color (0x7fff3333). Also add a matching legend entry
    # to the surface chart.
    c.addScatterLayer(dataX0, dataY0, "", CircleSymbol, 9, 0x7fff3333, 0x7fff3333).setSymbolScale(
        dataZ0)
    sc.getLegend().addKey("Hot Zone", 0x7fff3333)

    # Add bubbles with the semi-transparent blue color (0x7f3333ff). Also add a matchine legend
    # entry to the surface chart
    c.addScatterLayer(dataX1, dataY1, "", CircleSymbol, 9, 0x7f3333ff, 0x7f3333ff).setSymbolScale(
        dataZ1)
    sc.getLegend().addKey("Wet Zone", 0x7f3333ff)

    # Before we generate the bubble chart as texture, we must layout the surface chart first. It is
    # because the bubble chart axis scale depends on the surface chart axis scale.
    sc.layout()

    # Output the bubble chart and save it as a resource
    sc.setResource("texture", c.makeChart3())
    # Use the resource as the texture
    sc.setSurfaceTexture(sc.patternColor("@/texture"))

# Use a polar chart as the surface texture
def addPolarTexture(sc) :
    sc.setSurfaceAxisGrid(Transparent, Transparent)

    c = PolarChart(sc.getPlotRegionWidth(), sc.getPlotRegionDepth(), Transparent)

    c.setPlotArea(int(c.getWidth() / 2), int(c.getHeight() / 2), int(c.getWidth() / 2))

    # Use alternative light grey/dark grey circular background color
    c.setPlotAreaBg(0xaf000000, Transparent)

    # Set the grid style to circular grid
    c.setGridStyle(0)

    # Set angular axis as 0 - 360, with a spoke every 30 units
    c.angularAxis().setLinearScale(0, 360, 30)
    c.angularAxis().setLabelStyle("normal", 8, Transparent)
    c.radialAxis().setLinearScale(0, 10, 2)
    c.radialAxis().setColors(Transparent, Transparent)

    # Output the polar chart and save it as a resource
    sc.setResource("texture", c.makeChart3())
    # Use the resource as the texture
    sc.setSurfaceTexture(sc.patternColor("@/texture"))


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 * y.
    dataZ = [0] * (len(dataX) * len(dataY))
    for yIndex in range(0, len(dataY)) :
        for xIndex in range(0, len(dataX)) :
            dataZ[yIndex * len(dataX) + xIndex] = dataX[xIndex] * dataY[yIndex]

    # Create a SurfaceChart object of size 480 x 450 pixels
    c = SurfaceChart(480, 450)

    # Set the center of the plot region at (240, 210), and set width x depth x height to 240 x 240 x
    # 200 pixels
    c.setPlotRegion(240, 210, 240, 240, 200)

    # Set the elevation and rotation angles to 30 and 15 degrees
    c.setViewAngle(30, 15)

    # Set the data to use to plot the chart
    c.setData(dataX, dataY, dataZ)

    # Spline interpolate data to a 80 x 80 grid for a smooth surface
    c.setInterpolation(80, 80)

    # Reserve 50 pixels at the bottom of the z-axis to allow for the XY projection
    c.zAxis().setMargin(0, 50)

    # Add XY projection
    c.addXYProjection()

    # Use semi-transparent black (0xc0000000) for x and y major surface grid lines. Use dotted style
    # for x and y minor surface grid lines.
    majorGridColor = 0xc0000000
    minorGridColor = c.dashLineColor(majorGridColor, DotLine)
    c.setSurfaceAxisGrid(majorGridColor, majorGridColor, minorGridColor, minorGridColor)

    # Get the surface texture
    textureChart = None
    if chartIndex == 0 :
        # Surface texture is a bubble chart
        c.addTitle("<*underline=2*>Bubble Chart Texture", "Arial Bold", 16)

        # This texture uses the legend box, so we need to add a legend box to the chart at (490,
        # 200).
        b = c.addLegend(490, 200, 1, "Arial Bold", 10)
        b.setBackground(Transparent, Transparent)
        b.setMaxWidth(c.getWidth() - 490 - 1)

        # Add the texture
        addBubbleTexture(c)
    elif chartIndex == 1 :
        # Surface Texture is a polar chart
        c.addTitle("<*underline=2*>Polar Chart Texture", "Arial Bold", 16)

        # This texture uses the color axis, so we add the color axis at (420, 75)
        cAxis = c.setColorAxis(420, 75, TopLeft, 200, Right)

        # By default, the color axis synchronizes with the z-axis. We cancel the synchronization so
        # that the color axis will auto-scale independently.
        cAxis.syncAxis(None)

        # Add the texture
        addPolarTexture(c)
    else :
        # Surface Texture is an image
        c.addTitle("<*underline=2*>Image Texture", "Arial Bold", 16)

        # Use a DrawArea to load the image
        d = DrawArea()
        d.load("maptexture.png")
        d.resize(c.getPlotRegionWidth(), c.getPlotRegionDepth())

        # Set the DrawArea as a resource
        c.setResource("texture", d)
        # Use the resource as the texture
        c.setSurfaceTexture(c.patternColor("@/texture"))

    # Set contour lines to semi-transparent white (80ffffff)
    c.setContourColor(0x80ffffff)

    # Set the x, y and z axis titles using 10 pt Arial Bold font
    c.xAxis().setTitle("X Title<*br*>Placeholder", "Arial Bold", 10)
    c.yAxis().setTitle("Y Title<*br*>Placeholder", "Arial Bold", 10)
    c.zAxis().setTitle("Z Title Placeholder", "Arial Bold", 10)

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


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