ChartDirector 6.0 (C++ Edition)

Surface Wireframe


          

This example demonstrates the rectangular and triangular wireframes of a surface at different interpolation levels, configured using SurfaceChart.setShadingMode and SurfaceChart.setInterpolation.

Source Code Listing

[The following code is available in "cppdemo/surfacewireframe". A MFC version of the code is available in "mfcdemo/mfcdemo" (Windows edition only). A QT version of the code is available in "qtdemo/qtdemo".]
#include "chartdir.h"
#include <math.h>

void createChart(int chartIndex, const char *filename)
{
    // The x and y coordinates of the grid
    double dataX[] = {-2, -1, 0, 1, 2};
    double dataY[] = {-2, -1, 0, 1, 2};

    // The values at the grid points. In this example, we will compute the values using the formula
    // z = square_root(15 - x * x - y * y).
    double dataZ[(int)(sizeof(dataX) / sizeof(dataX[0])) * (int)(sizeof(dataY) / sizeof(dataY[0]))];
    for(int yIndex = 0; yIndex < (int)(sizeof(dataY) / sizeof(dataY[0])); ++yIndex) {
        double y = dataY[yIndex];
        for(int xIndex = 0; xIndex < (int)(sizeof(dataX) / sizeof(dataX[0])); ++xIndex) {
            double x = dataX[xIndex];
            dataZ[yIndex * (int)(sizeof(dataX) / sizeof(dataX[0])) + xIndex] = sqrt(15 - x * x - y *
                y);
        }
    }

    // Create a SurfaceChart object of size 380 x 340 pixels, with white (ffffff) background and
    // grey (888888) border.
    SurfaceChart *c = new SurfaceChart(380, 340, 0xffffff, 0x888888);

    // Demonstrate various wireframes with and without interpolation
    if (chartIndex == 0) {
        // Original data without interpolation
        c->addTitle("5 x 5 Data Points\nStandard Shading", "arialbd.ttf", 12);
        c->setContourColor(0x80ffffff);
    } else if (chartIndex == 1) {
        // Original data, spline interpolated to 40 x 40 for smoothness
        c->addTitle("5 x 5 Points - Spline Fitted to 40 x 40\nStandard Shading", "arialbd.ttf", 12);
        c->setContourColor(0x80ffffff);
        c->setInterpolation(40, 40);
    } else if (chartIndex == 2) {
        // Rectangular wireframe of original data
        c->addTitle("5 x 5 Data Points\nRectangular Wireframe");
        c->setShadingMode(Chart::RectangularFrame);
    } else if (chartIndex == 3) {
        // Rectangular wireframe of original data spline interpolated to 40 x 40
        c->addTitle("5 x 5 Points - Spline Fitted to 40 x 40\nRectangular Wireframe");
        c->setShadingMode(Chart::RectangularFrame);
        c->setInterpolation(40, 40);
    } else if (chartIndex == 4) {
        // Triangular wireframe of original data
        c->addTitle("5 x 5 Data Points\nTriangular Wireframe");
        c->setShadingMode(Chart::TriangularFrame);
    } else {
        // Triangular wireframe of original data spline interpolated to 40 x 40
        c->addTitle("5 x 5 Points - Spline Fitted to 40 x 40\nTriangular Wireframe");
        c->setShadingMode(Chart::TriangularFrame);
        c->setInterpolation(40, 40);
    }

    // Set the center of the plot region at (200, 170), and set width x depth x height to 200 x 200
    // x 150 pixels
    c->setPlotRegion(200, 170, 200, 200, 150);

    // Set the plot region wall thichness to 5 pixels
    c->setWallThickness(5);

    // Set the elevation and rotation angles to 20 and 30 degrees
    c->setViewAngle(20, 30);

    // Set the data to use to plot the chart
    c->setData(DoubleArray(dataX, (int)(sizeof(dataX) / sizeof(dataX[0]))), DoubleArray(dataY,
        (int)(sizeof(dataY) / sizeof(dataY[0]))), DoubleArray(dataZ, (int)(sizeof(dataZ) / sizeof(
        dataZ[0]))));

    // Output the chart
    c->makeChart(filename);

    //free up resources
    delete c;
}

int main(int argc, char *argv[])
{
    createChart(0, "surfacewireframe0.jpg");
    createChart(1, "surfacewireframe1.jpg");
    createChart(2, "surfacewireframe2.jpg");
    createChart(3, "surfacewireframe3.jpg");
    createChart(4, "surfacewireframe4.jpg");
    createChart(5, "surfacewireframe5.jpg");
    return 0;
}