This example illustrates setting an axis to log scale using
Axis.setLogScale3.
[The following project is available in "cppdemo/logaxis".]
#include "chartdir.h"
void createChart(int img, const char *filename)
{
//The data for the chart
double data[] = {100, 125, 260, 147, 67};
const char *labels[] = {"Mon", "Tue", "Wed", "Thu", "Fri"};
//Create a XYChart object of size 200 x 180 pixels
XYChart *c = new XYChart(200, 180);
//Set the plot area at (30, 10) and of size 140 x 130 pixels
c->setPlotArea(30, 10, 140, 130);
//Ise log scale axis if required
if (img == 1) {
c->yAxis()->setLogScale();
}
//Set the labels on the x axis
c->xAxis()->setLabels(StringArray(labels, sizeof(labels)/sizeof(*labels)));
//Add a color bar layer using the given data. Use a 1 pixel 3D border for
//the bars.
c->addBarLayer(DoubleArray(data, sizeof(data)/sizeof(*data)), IntArray(0, 0)
)->setBorderColor(-1, 1);
//output the chart
c->makeChart(filename);
//free up resources
delete c;
}
int main(int argc, char *argv[]) {
createChart(0, "logaxis0.png");
createChart(1, "logaxis1.png");
return 0;
}
|
© 2003 Advanced Software Engineering Limited. All rights reserved.