Surface Lines and Zones

pythondemo\surfacelinezone.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

# The x and y coordinates of the grid
dataX = [-4, -3, -2, -1, 0, 1, 2, 3, 4]
dataY = [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 =
# 20 / (1 + 1 / (1 + 3.5 ** (x + 0.5))) - 10.
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] = 20 / (1 + 1 / (1 + 3.5 ** (dataX[xIndex] + 0.5))) - 10

# Create a SurfaceChart object of size 720 x 600 pixels
c = SurfaceChart(720, 600)

# Set the center of the plot region at (350, 280), and set width x depth x height to 360 x 360 x 270
# pixels
c.setPlotRegion(350, 280, 360, 360, 270)

# 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)

# Set the elevation and rotation angles to 30 and 315 degrees
c.setViewAngle(45, 315)

# Add a color axis (the legend) 20 pixels from the right border. Set the length to 200 pixels and
# the labels on the right side.
cAxis = c.setColorAxis(c.getWidth() - 20, 275, Right, 200, Right)

# The color gradient used for the color axis
colorGradient = [0x00aa00, 0x66ff00, 0xffff00, 0xffcc00, 0xff0000]
cAxis.setColorGradient(0, colorGradient)

# Add a semi-transparent blue (0x7f0000ff) rectangular surface zone with opposite corners at (0, 1)
# and (1.6, 2)
c.addSurfaceZone(0, 1, 1.6, 2, 0x7f0000ff, 0x7f0000ff, 2)

# Add a semi-transparent grey (0x7fdddddd) rectangular surface zone with opposite corners at (2, 7)
# and (3.5, 9.5)
c.addSurfaceZone(2, 7, 3.5, 9.5, 0x7fdddddd, 0x7fdddddd, 2)

# Add a surface line from (-4, 3) to (0, 10). Use brown (0x444400) dash line with a line width of 2
# pixels.
c.addSurfaceLine(-4, 3, 0, 10, c.dashLineColor(0x444400), 2)

# Add a surface line from (-2, 10) to (0, 5) to (1, 8) to (4, 0.5). Use purple color with a line
# width of 2 pixels.
lineX = [-2, 0, 1, 4]
lineY = [10, 5, 8, 0.5]
c.addSurfaceLine2(lineX, lineY, 0x880088, 2)

# Add two surface lins to create a X symbol.
c.addSurfaceLine(-1.4, 3.9, -1.6, 4.1, 0x000088, 2)
c.addSurfaceLine(-1.6, 3.9, -1.4, 4.1, 0x000088, 2)

# Add a small surface zone with transparent fill color and a 2-pixel border to create a square
# symbol.
c.addSurfaceZone(-1.4, 2.9, -1.6, 3.1, Transparent, 0x000088, 2)

# Add a legend box align to the right edge of the chart. Use 10pt Arial Bold font. Set the
# background and border to transparent.
b = c.addLegend(c.getWidth() - 1, 10, 1, "Arial Bold", 10)
b.setAlignment(TopRight)
b.setBackground(Transparent, Transparent)

# Set the legend icon size to 24 x 15 pixels. Set a gap of 10 pixels between the icon and the text.
b.setKeySize(24, 15, 10)

# Add legend entries for the zones, lines and symbols
b.addKey("Sample Zone 1", 0x7f0000ff)
b.addKey("Sample Zone 2", 0x7fdddddd)
b.addKey("Sample Line 1", 0x880088, 2)
b.addKey("Sample Line 2", c.dashLineColor(0x444400), 2)
b.addText(
    "<*block,width=24,halign=center*><*img=@Square,width=11,edgeColor=000000*><*/*><*advance=10*>" \
    "Symbol 1")
b.addText(
    "<*block,width=24,halign=center*><*img=@Cross2(0.1),width=11,color=000000*><*/*>" \
    "<*advance=10*>Symbol 2")

# Set the x, y and z axis titles using 12pt Arial Bold font
c.xAxis().setTitle("X Title<*br*>Placeholder", "Arial Bold", 12)
c.yAxis().setTitle("Y Title<*br*>Placeholder", "Arial Bold", 12)
c.zAxis().setTitle("Z Title Placeholder", "Arial Bold", 12)

# Output the chart
c.makeChart("surfacelinezone.png")