ChartDirector 7.1 (C++ Edition)

Binary Data Series




This example demonstrates a chart representing binary data series.

A binary data series is a series with elements that can only assume two values. In this example, 0 and 1 are used to represent the two values.

There are plenty of methods to represent binary data series in a chart. In this example, three methods are demonstrated.

Source Code Listing

The following is the command line version of the code in "cppdemo/binaryseries". 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 data for the chart double dataY[] = {1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 1}; const int dataY_size = (int)(sizeof(dataY)/sizeof(*dataY)); double dataX[] = {Chart::chartTime(2008, 7, 1, 0, 0, 0), Chart::chartTime(2008, 7, 1, 2, 17, 2), Chart::chartTime(2008, 7, 1, 8, 5, 30), Chart::chartTime(2008, 7, 1, 10, 54, 10), Chart::chartTime(2008, 7, 1, 15, 40, 0), Chart::chartTime(2008, 7, 1, 18, 22, 20), Chart::chartTime(2008, 7, 1, 22, 17, 14), Chart::chartTime(2008, 7, 2, 2, 55, 50), Chart::chartTime(2008, 7, 2, 8, 17, 14), Chart::chartTime(2008, 7, 2, 11, 55, 50), Chart::chartTime(2008, 7, 2, 13, 17, 14), Chart::chartTime(2008, 7, 2, 17, 55, 50), Chart::chartTime(2008, 7, 2, 20, 17, 14), Chart::chartTime(2008, 7, 3, 0, 0, 0)}; const int dataX_size = (int)(sizeof(dataX)/sizeof(*dataX)); // In this example, we only use position 1, 3, 5 for the data series. Positions 0, 2, 4, 6 are // empty and serve as gaps. const char* labels[] = {"", "ON Only Filling", "", "<*font,color=cc2200*>ON<*/font*> / <*font,color=00aa22*>OFF<*/font*> Filling", "", "Logic Line", ""}; const int labels_size = (int)(sizeof(labels)/sizeof(*labels)); // Create a XYChart object of size 600 x 180 pixels XYChart* c = new XYChart(600, 180); // Add a title to the chart using 10 points Arial Bold font. Set top/bottom margins to 12 // pixels. TextBox* title = c->addTitle("Binary Data Series Demonstration", "Arial Bold", 10); // Tentatively set the plotarea at (100, 30) and of size 470 x 120 pixels. Use transparent // border. Use grey (888888) solid line and light grey (ccccc) dotted line as major and minor // vertical grid lines. c->setPlotArea(100, 30, 470, 120, -1, -1, Chart::Transparent)->setGridColor(Chart::Transparent, 0x888888, Chart::Transparent, c->dashLineColor(0xcccccc, Chart::DotLine)); // Set axes to transparent c->xAxis()->setColors(Chart::Transparent); c->yAxis()->setColors(Chart::Transparent); // Set the y axis labels c->yAxis()->setLabels(StringArray(labels, labels_size)); // Set y-axis label style to 8pt Arial Bold c->yAxis()->setLabelStyle("Arial Bold", 8); // Set x-axis major and minor tick density to 50 and 5 pixels. ChartDirector auto-scaling will // use this as the guideline when putting ticks on the x-axis. c->xAxis()->setTickDensity(50, 5); // Use "<*font=Arial Bold*>{value|mmm dd}" for the first label of an hour, and "{value|hh:nn}" // for all other labels. c->xAxis()->setMultiFormat(Chart::StartOfDayFilter(), "<*font=Arial Bold*>{value|mmm dd}", Chart::AllPassFilter(), "{value|hh:nn}"); // // A Logic Line can be achieved using a StepLineLayer in ChartDirector // // Shift the data by 4.5, so instead of 0 - 1, it is now 4.5 to 5.5, or fluctuate around the y = // 5 (Logic Line label) position. ArrayMath shiftedLine0 = ArrayMath(DoubleArray(dataY, dataY_size)).add(4.5); // Add step lines using the original and the reversed data StepLineLayer* layer0 = c->addStepLineLayer(shiftedLine0, 0x0000ff); layer0->setXData(DoubleArray(dataX, dataX_size)); // // To perform ON/OFF filling, we draw the logic line, and its reverse, and fill the region in // between // // Shift the data by 2.5, so instead of 0 - 1, it is now 2.5 to 3.5, or fluctuate around the y = // 3 (ON/OFF Filing label) position. ArrayMath shiftedLine1 = ArrayMath(DoubleArray(dataY, dataY_size)).add(2.5); // Reverse the data, so the 0 becomes 1 and 1 becomes 0, and shift it as well. ArrayMath reverseShiftedLine1 = ArrayMath(DoubleArray(dataY, dataY_size)).mul(-1).add(3.5); // Add step lines using the original and the reversed data StepLineLayer* layer1 = c->addStepLineLayer(shiftedLine1, Chart::Transparent); layer1->addDataSet(reverseShiftedLine1, Chart::Transparent); layer1->setXData(DoubleArray(dataX, dataX_size)); // Fill the region between the two step lines with green (00aa22) or red (cc2200), depending on // whether the original or the reserve is higher. c->addInterLineLayer(layer1->getLine(0), layer1->getLine(1), 0x00aa22, 0xcc2200); // // The ON Only filling is the same as ON/OFF filling, except the OFF filling color is // transparent // // Shift the data by 0.5, so instead of 0 - 1, it is now 0.5 to 1.5, or fluctuate around the y = // 1 (ON Only Filing label) position. ArrayMath shiftedLine2 = ArrayMath(DoubleArray(dataY, dataY_size)).add(0.5); // Reverse the data, so the 0 becomes 1 and 1 becomes 0, and shift it as well. ArrayMath reverseShiftedLine2 = ArrayMath(DoubleArray(dataY, dataY_size)).mul(-1).add(1.5); // Add step lines using the original and the reversed data StepLineLayer* layer2 = c->addStepLineLayer(shiftedLine2, Chart::Transparent); layer2->addDataSet(reverseShiftedLine2, Chart::Transparent); layer2->setXData(DoubleArray(dataX, dataX_size)); // Fill the region between the two step lines with green (00aa22) or transparent, depending on // whether the original or the reserve is higher. c->addInterLineLayer(layer2->getLine(0), layer2->getLine(1), 0x00aa22, Chart::Transparent); // Adjust the plot area size, such that the bounding box (inclusive of axes) is 10 pixels from // the left edge, 10 pixels below the title, 30 pixels from the right edge, and 10 pixels above // the bottom edge. c->packPlotArea(10, title->getHeight() + 10, c->getWidth() - 30, c->getHeight() - 10); // Output the chart c->makeChart("binaryseries.png"); //free up resources delete c; return 0; }