ChartDirector 6.0 (C++ Edition)

Surface Chart (1)

This example demonstrates the basic steps in creating surface charts.

Source Code Listing

[The following code is available in "cppdemo/surface". 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 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}; double dataY[] = {-10, -9, -8, -7, -6, -5, -4, -3, -2, -1, 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 = x * sin(y) + y * sin(x). 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] = 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 ", "timesi.ttf", 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, (int)(sizeof(dataX) / sizeof(dataX[0]))), DoubleArray(dataY, (int)(sizeof(dataY) / sizeof(dataY[0]))), DoubleArray(dataZ, (int)(sizeof(dataZ) / sizeof( dataZ[0])))); // 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)", "arialbd.ttf", 10); c->yAxis()->setTitle("Y (nm)", "arialbd.ttf", 10); c->zAxis()->setTitle("Energy Density (J/m<*font,super*>2<*/font*>)", "arialbd.ttf", 10); // Output the chart c->makeChart("surface.jpg"); //free up resources delete c; return 0; }```