ChartDirector 7.1 (C++ Edition)

Surface Perspective


          

This example demonstrates the effects of various perspective depth, configured using ThreeDChart.setPerspective.

Source Code Listing

The following is the command line version of the code in "cppdemo/surfaceperspective". 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> #include <stdio.h> void createChart(int chartIndex, const char *filename) { char buffer[1024]; // The x and y coordinates of the grid double dataX[] = {0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0}; const int dataX_size = (int)(sizeof(dataX)/sizeof(*dataX)); double dataY[] = {0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0}; 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 = sin((x - 0.5) * 2 * pi) * sin((y - 0.5) * 2 * pi) const int dataZ_size = dataX_size * dataY_size; double dataZ[dataZ_size]; for(int yIndex = 0; yIndex < dataY_size; ++yIndex) { double y = (dataY[yIndex] - 0.5) * 2 * 3.1416; for(int xIndex = 0; xIndex < dataX_size; ++xIndex) { double x = (dataX[xIndex] - 0.5) * 2 * 3.1416; dataZ[yIndex * dataX_size + xIndex] = sin(x) * sin(y); } } // the perspective level int perspective = chartIndex * 12; // Create a SurfaceChart object of size 360 x 360 pixels, with white (ffffff) background and // grey (888888) border. SurfaceChart* c = new SurfaceChart(360, 360, 0xffffff, 0x888888); // Set the perspective level c->setPerspective(perspective); sprintf(buffer, "Perspective = %d", perspective); c->addTitle(buffer); // Set the center of the plot region at (195, 165), and set width x depth x height to 200 x 200 // x 150 pixels c->setPlotRegion(195, 165, 200, 200, 150); // Set the plot region wall thichness to 5 pixels c->setWallThickness(5); // Set the elevation and rotation angles to 30 and 30 degrees c->setViewAngle(30, 30); // 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 40 x 40 grid for a smooth surface c->setInterpolation(40, 40); // Use smooth gradient coloring. c->colorAxis()->setColorGradient(); // Output the chart c->makeChart(filename); //free up resources delete c; } int main(int argc, char *argv[]) { createChart(0, "surfaceperspective0.jpg"); createChart(1, "surfaceperspective1.jpg"); createChart(2, "surfaceperspective2.jpg"); createChart(3, "surfaceperspective3.jpg"); createChart(4, "surfaceperspective4.jpg"); createChart(5, "surfaceperspective5.jpg"); return 0; }