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 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; }```