ChartDirector 7.1 (C++ Edition)

Surface Chart Axis Types




The example demonstrates different axis scale types for the surface charts.

Like an XYChart, in a SurfaceChart, the axis scale can represent numbers, date/time or labels. In this example, the x-axis uses a date/time scale, the y-axis uses a label based scale, and the z-axis uses a numeric scale.

Source Code Listing

The following is the command line version of the code in "cppdemo/surfaceaxis". 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" int main(int argc, char *argv[]) { // The x and y coordinates of the grid double dataX[] = {Chart::chartTime(2008, 9, 1), Chart::chartTime(2008, 9, 2), Chart::chartTime( 2008, 9, 3), Chart::chartTime(2008, 9, 4), Chart::chartTime(2008, 9, 5), Chart::chartTime( 2008, 9, 6)}; const int dataX_size = (int)(sizeof(dataX)/sizeof(*dataX)); const char* dataY[] = {"Low", "Medium", "High"}; const int dataY_size = (int)(sizeof(dataY)/sizeof(*dataY)); // The data series double lowData[] = {24, 38, 33, 25, 28, 36}; const int lowData_size = (int)(sizeof(lowData)/sizeof(*lowData)); double mediumData[] = {49, 42, 34, 47, 53, 50}; const int mediumData_size = (int)(sizeof(mediumData)/sizeof(*mediumData)); double highData[] = {44, 51, 38, 33, 47, 42}; const int highData_size = (int)(sizeof(highData)/sizeof(*highData)); // Create a SurfaceChart object of size 760 x 500 pixels SurfaceChart* c = new SurfaceChart(760, 500); // Add a title to the chart using 18 points Arial font c->addTitle("Surface Chart Axis Types", "Arial", 18); // Set the center of the plot region at (385, 240), and set width x depth x height to 480 x 240 // x 240 pixels c->setPlotRegion(385, 240, 480, 240, 240); // Set the elevation and rotation angles to 30 and -10 degrees c->setViewAngle(30, -10); // Set the data to use to plot the chart. As the y-data are text strings (enumerated), we will // use an empty array for the y-coordinates. For the z data series, they are just the // concatenation of the individual data series. c->setData(DoubleArray(dataX, dataX_size), DoubleArray(), ArrayMath(DoubleArray(lowData, lowData_size)).insert(DoubleArray(mediumData, mediumData_size)).insert(DoubleArray(highData, highData_size))); // Set the y-axis labels c->yAxis()->setLabels(StringArray(dataY, dataY_size)); // Set x-axis tick density to 75 pixels. ChartDirector auto-scaling will use this as the // guideline when putting ticks on the x-axis. c->xAxis()->setTickDensity(75); // Spline interpolate data to a 80 x 40 grid for a smooth surface c->setInterpolation(80, 40); // Set surface grid lines to semi-transparent black (cc000000). c->setSurfaceAxisGrid(0xcc000000); // Set contour lines to the same color as the fill color at the contour level c->setContourColor(Chart::SameAsMainColor); // Add a color axis (the legend) in which the top right corner is anchored at (95, 100). Set the // length to 160 pixels and the labels on the left side. ColorAxis* cAxis = c->setColorAxis(95, 100, Chart::TopRight, 160, Chart::Left); // Add a bounding box with light grey (eeeeee) background and grey (888888) border. cAxis->setBoundingBox(0xeeeeee, 0x888888); // Set label style to Arial bold for all axes c->xAxis()->setLabelStyle("Arial Bold"); c->yAxis()->setLabelStyle("Arial Bold"); c->zAxis()->setLabelStyle("Arial Bold"); c->colorAxis()->setLabelStyle("Arial Bold"); // Set the x, y and z axis titles using deep blue (000088) 15 points Arial font c->xAxis()->setTitle("Date/Time Axis", "Arial Italic", 15, 0x000088); c->yAxis()->setTitle("Label\nBased\nAxis", "Arial Italic", 15, 0x000088); c->zAxis()->setTitle("Numeric Axis", "Arial Italic", 15, 0x000088); // Output the chart c->makeChart("surfaceaxis.jpg"); //free up resources delete c; return 0; }