#include "chartdir.h"
#include <math.h>
void createChart(int img, const char *filename)
{
// The x and y coordinates of the grid
double dataX[] = {-4, -3, -2, -1, 0, 1, 2, 3, 4};
double dataY[] = {-4, -3, -2, -1, 0, 1, 2, 3, 4};
// The values at the grid points. In this example, we will compute the values
// using the formula z = Sin(x * pi / 3) * Sin(y * pi / 3).
double dataZ[(int)(sizeof(dataX) / sizeof(dataX[0])) * (int)(sizeof(dataY) /
sizeof(dataY[0]))];
int yIndex;
for(yIndex = 0; yIndex < (int)(sizeof(dataY) / sizeof(dataY[0])); ++yIndex) {
double y = dataY[yIndex];
int xIndex;
for(xIndex = 0; xIndex < (int)(sizeof(dataX) / sizeof(dataX[0])); ++xIndex) {
double x = dataX[xIndex];
dataZ[yIndex * (int)(sizeof(dataX) / sizeof(dataX[0])) + xIndex] = sin(x
* 3.1416 / 3) * sin(y * 3.1416 / 3);
}
}
// Create a XYChart object of size 360 x 360 pixels
XYChart *c = new XYChart(360, 360);
// Set the plotarea at (30, 25) and of size 300 x 300 pixels. Use
// semi-transparent black (c0000000) for both horizontal and vertical grid lines
c->setPlotArea(30, 25, 300, 300, -1, -1, -1, 0xc0000000, -1);
// Add a contour layer using the given data
ContourLayer *layer = c->addContourLayer(DoubleArray(dataX, (int)(sizeof(dataX) /
sizeof(dataX[0]))), DoubleArray(dataY, (int)(sizeof(dataY) / sizeof(dataY[0])
)), DoubleArray(dataZ, (int)(sizeof(dataZ) / sizeof(dataZ[0]))));
// Set the x-axis and y-axis scale
c->xAxis()->setLinearScale(-4, 4, 1);
c->yAxis()->setLinearScale(-4, 4, 1);
if (img == 0) {
// Discrete coloring, spline surface interpolation
c->addTitle("Spline Surface - Discrete Coloring", "arialbi.ttf", 12);
} else if (img == 1) {
// Discrete coloring, linear surface interpolation
c->addTitle("Linear Surface - Discrete Coloring", "arialbi.ttf", 12);
layer->setSmoothInterpolation(false);
} else if (img == 2) {
// Smooth coloring, spline surface interpolation
c->addTitle("Spline Surface - Continuous Coloring", "arialbi.ttf", 12);
layer->setContourColor(Chart::Transparent);
layer->colorAxis()->setColorGradient(true);
} else {
// Discrete coloring, linear surface interpolation
c->addTitle("Linear Surface - Continuous Coloring", "arialbi.ttf", 12);
layer->setSmoothInterpolation(false);
layer->setContourColor(Chart::Transparent);
layer->colorAxis()->setColorGradient(true);
}
// Output the chart
c->makeChart(filename);
//free up resources
delete c;
}
int main(int argc, char *argv[])
{
createChart(0, "contourinterpolate0.jpg");
createChart(1, "contourinterpolate1.jpg");
createChart(2, "contourinterpolate2.jpg");
createChart(3, "contourinterpolate3.jpg");
return 0;
} |