#include "chartdir.h"
void createChart(int chartIndex, 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};
// Use random numbers for the z values on the XY grid
RanSeries *r = new RanSeries(99);
DoubleArray dataZ = r->get2DSeries((int)(sizeof(dataX) / sizeof(dataX[0])), (int)(sizeof(dataY)
/ sizeof(dataY[0])), -0.9, 0.9);
// Create a XYChart object of size 420 x 360 pixels
XYChart *c = new XYChart(420, 360);
// Set the plotarea at (30, 25) and of size 300 x 300 pixels. Use semi-transparent grey
// (0xdd000000) horizontal and vertical grid lines
c->setPlotArea(30, 25, 300, 300, -1, -1, -1, 0xdd000000, -1);
// Set the x-axis and y-axis scale
c->xAxis()->setLinearScale(-4, 4, 1);
c->yAxis()->setLinearScale(-4, 4, 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]))), dataZ);
// Move the grid lines in front of the contour layer
c->getPlotArea()->moveGridBefore(layer);
// Add a color axis (the legend) in which the top left corner is anchored at (350, 25). Set the
// length to 400 300 and the labels on the right side.
ColorAxis *cAxis = layer->setColorAxis(350, 25, Chart::TopLeft, 300, Chart::Right);
if (chartIndex == 1) {
// Speicify a color gradient as a list of colors, and use it in the color axis.
int colorGradient[] = {0x0044cc, 0xffffff, 0x00aa00};
cAxis->setColorGradient(false, IntArray(colorGradient, (int)(sizeof(colorGradient) / sizeof(
colorGradient[0]))));
} else if (chartIndex == 2) {
// Specify the color scale to use in the color axis
double colorScale[] = {-1.0, 0x1a9850, -0.75, 0x66bd63, -0.5, 0xa6d96a, -0.25, 0xd9ef8b, 0,
0xfee08b, 0.25, 0xfdae61, 0.5, 0xf46d43, 0.75, 0xd73027, 1};
cAxis->setColorScale(DoubleArray(colorScale, (int)(sizeof(colorScale) / sizeof(colorScale[0]
))));
} else if (chartIndex == 3) {
// Specify the color scale to use in the color axis. Also specify an underflow color
// 0x66ccff (blue) for regions that fall below the lower axis limit.
double colorScale[] = {0, 0xffff99, 0.2, 0x80cdc1, 0.4, 0x35978f, 0.6, 0x01665e, 0.8,
0x003c30, 1};
cAxis->setColorScale(DoubleArray(colorScale, (int)(sizeof(colorScale) / sizeof(colorScale[0]
))), 0x66ccff);
}
// Output the chart
c->makeChart(filename);
//free up resources
delete r;
delete c;
}
int main(int argc, char *argv[])
{
createChart(0, "contourcolor0.png");
createChart(1, "contourcolor1.png");
createChart(2, "contourcolor2.png");
createChart(3, "contourcolor3.png");
return 0;
} |