Surface Lines and Zones

The following is the command line version of the code in "cppdemo/surfacelinezone". The MFC version of the code is in "mfcdemo/mfcdemo". The Qt Widgets version of the code is in "qtdemo/qtdemo". The QML/Qt Quick version of the code is in "qmldemo/qmldemo".
#include "chartdir.h"
#include <math.h>

int main(int argc, char *argv[])
{
    // The x and y coordinates of the grid
    double dataX[] = {-4, -3, -2, -1, 0, 1, 2, 3, 4};
    const int dataX_size = (int)(sizeof(dataX)/sizeof(*dataX));
    double dataY[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
    const int dataY_size = (int)(sizeof(dataY)/sizeof(*dataY));

    // 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.
    const int dataZ_size = dataX_size * dataY_size;
    double dataZ[dataZ_size];
    for(int yIndex = 0; yIndex < dataY_size; ++yIndex) {
        for(int xIndex = 0; xIndex < dataX_size; ++xIndex) {
            dataZ[yIndex * dataX_size + xIndex] = 20 / (1 + 1 / (1 + pow(3.5, dataX[xIndex] + 0.5)))
                 - 10;
        }
    }

    // Create a SurfaceChart object of size 720 x 600 pixels
    SurfaceChart* c = new 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(DoubleArray(dataX, dataX_size), DoubleArray(dataY, dataY_size), DoubleArray(dataZ,
        dataZ_size));

    // 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.
    ColorAxis* cAxis = c->setColorAxis(c->getWidth() - 20, 275, Chart::Right, 200, Chart::Right);

    // The color gradient used for the color axis
    int colorGradient[] = {0x00aa00, 0x66ff00, 0xffff00, 0xffcc00, 0xff0000};
    const int colorGradient_size = (int)(sizeof(colorGradient)/sizeof(*colorGradient));
    cAxis->setColorGradient(false, IntArray(colorGradient, colorGradient_size));

    // 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.
    double lineX[] = {-2, 0, 1, 4};
    const int lineX_size = (int)(sizeof(lineX)/sizeof(*lineX));
    double lineY[] = {10, 5, 8, 0.5};
    const int lineY_size = (int)(sizeof(lineY)/sizeof(*lineY));
    c->addSurfaceLine(DoubleArray(lineX, lineX_size), DoubleArray(lineY, lineY_size), 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, Chart::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.
    LegendBox* b = c->addLegend(c->getWidth() - 1, 10, true, "Arial Bold", 10);
    b->setAlignment(Chart::TopRight);
    b->setBackground(Chart::Transparent, Chart::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");

    //free up resources
    delete c;

    return 0;
}