Surface Chart (1)

This example demonstrates the basic steps in creating surface charts.

Create a SurfaceChart object using SurfaceChart.SurfaceChart.
Specify the position and size of the plot region using ThreeDChart.setPlotRegion.
Set data to the chart using SurfaceChart.setData.
Interpolate the data using SurfaceChart.setInterpolation for extra smoothness of the surface.
Set the position of the color axis (the color legend) using ThreeDChart.setColorAxis.
Add chart and axis titles using BaseChart.addTitle and Axis.setTitle.
Pass the chart to the CChartViewer for display using CChartViewer.setChart (MFC version) or QChartViewer.setChart (Qt version), or generate the chart as an image file using BaseChart.makeChart (Command Line version).

The following is the command line version of the code in "cppdemo/surface". 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[] = {-10, -9, -8, -7, -6, -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
    const int dataX_size = (int)(sizeof(dataX)/sizeof(*dataX));
    double dataY[] = {-10, -9, -8, -7, -6, -5, -4, -3, -2, -1, 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 = x * sin(y) + y * sin(x).
    const int dataZ_size = dataX_size * dataY_size;
    double dataZ[dataZ_size];
    for(int yIndex = 0; yIndex < dataY_size; ++yIndex) {
        double y = dataY[yIndex];
        for(int xIndex = 0; xIndex < dataX_size; ++xIndex) {
            double x = dataX[xIndex];
            dataZ[yIndex * dataX_size + xIndex] = x * sin(y) + y * sin(x);
        }
    }

    // Create a SurfaceChart object of size 720 x 600 pixels
    SurfaceChart* c = new SurfaceChart(720, 600);

    // Add a title to the chart using 20 points Times New Roman Italic font
    c->addTitle("Surface Energy Density   ", "Times New Roman Italic", 20);

    // 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);

    // Add a color axis (the legend) in which the left center is anchored at (645, 270). Set the
    // length to 200 pixels and the labels on the right side.
    c->setColorAxis(645, 270, Chart::Left, 200, Chart::Right);

    // Set the x, y and z axis titles using 10 points Arial Bold font
    c->xAxis()->setTitle("X (nm)", "Arial Bold", 10);
    c->yAxis()->setTitle("Y (nm)", "Arial Bold", 10);
    c->zAxis()->setTitle("Energy Density (J/m<*font,super*>2<*/font*>)", "Arial Bold", 10);

    // Output the chart
    c->makeChart("surface.jpg");

    //free up resources
    delete c;

    return 0;
}