ChartDirector 7.1 (C++ Edition)

Enhanced Area Chart




This example extends the Simple Area Chart example by decorating the chart using a number of chart formatting features.

Source Code Listing

The following is the command line version of the code in "cppdemo/enhancedarea". 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 area chart double data[] = {30, 28, 40, 55, 75, 68, 54, 60, 50, 62, 75, 65, 75, 89, 60, 55, 53, 35, 50, 66, 56, 48, 52, 65, 62}; const int data_size = (int)(sizeof(data)/sizeof(*data)); // The labels for the area chart const char* labels[] = {"0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13", "14", "15", "16", "17", "18", "19", "20", "21", "22", "23", "24"}; const int labels_size = (int)(sizeof(labels)/sizeof(*labels)); // Create a XYChart object of size 600 x 360 pixels, with a brushed silver background, 1 pixel // 3D border effect, rounded corners and soft drop shadow. XYChart* c = new XYChart(600, 360, Chart::brushedSilverColor(), Chart::Transparent, 1); c->setRoundedFrame(); c->setDropShadow(); // Add a title box to the chart using 18pt Times Bold Italic font. TextBox* title = c->addTitle( "<*block,valign=absmiddle*><*img=star.png*><*img=star.png*> Performance Enhancer " "<*img=star.png*><*img=star.png*><*/*>", "Times New Roman Bold Italic", 18); // // Use a text box with a depressed 3D border to create the inner depressed region // // The width of the frame border int frameWidth = 5; // Set the depressed region position TextBox* contentBox = c->addText(frameWidth, title->getHeight(), ""); contentBox->setSize(c->getDrawArea()->getWidth() - 1 - frameWidth * 2, c->getDrawArea( )->getHeight() - title->getHeight() - frameWidth - 1); // Use -1 as the rasied effect to create a depressed region contentBox->setBackground(Chart::Transparent, Chart::Transparent, -1); // Set rounded corners, and put the text box at the back of the chart contentBox->setRoundedCorners(10); contentBox->setZOrder(Chart::ChartBackZ); // Tentatively set the plotarea to 50 pixels from the left depressed edge, and 25 pixels under // the top depressed edge. Set the width to 75 pixels less than the depressed region width, and // the height to 75 pixels less than the depressed region height. Use white (ffffff) background, // transparent border, and grey (cccccc) horizontal and vertical grid lines. PlotArea* plotArea = c->setPlotArea(50 + contentBox->getLeftX(), contentBox->getTopY() + 25, contentBox->getWidth() - 75, contentBox->getHeight() - 75, 0xffffff, -1, -1, 0xcccccc, -1); // Add a title to the y axis c->yAxis()->setTitle("Energy Concentration (KJ per liter)"); // Set the labels on the x axis. c->xAxis()->setLabels(StringArray(labels, labels_size)); // Display 1 out of 3 labels on the x-axis. c->xAxis()->setLabelStep(3); // Add a title to the x axis using CDML c->xAxis()->setTitle("<*block,valign=absmiddle*><*img=clock.png*> Elapsed Time (hour)<*/*>"); // Set the axes width to 2 pixels c->xAxis()->setWidth(2); c->yAxis()->setWidth(2); // Add an area layer to the chart using a gradient color that changes vertically from // semi-transparent red (60ff0000) to semi-transparent white (60ffffff) c->addAreaLayer(DoubleArray(data, data_size), c->linearGradientColor(0, contentBox->getTopY() + 20, 0, contentBox->getTopY() + contentBox->getHeight() - 50, 0x60ff0000, 0x60ffffff)); // Adjust the plot area size, such that the bounding box (inclusive of axes) is 15 pixels from // the left depressed edge, 25 pixels below the top depressed edge, 25 pixels from the right // depressed edge, and 15 pixels above the bottom depressed edge. c->packPlotArea(contentBox->getLeftX() + 15, contentBox->getTopY() + 25, contentBox->getLeftX() + contentBox->getWidth() - 25, contentBox->getTopY() + contentBox->getHeight() - 15); // Add a custom CDML text with the bottom right corner is anchored to the bootom right corner of // the plot area, with 5 pixels margin. c->addText(plotArea->getLeftX() + plotArea->getWidth() - 5, plotArea->getTopY() + plotArea->getHeight() - 5, "<*block,valign=absmiddle*><*img=small_molecule.png*> <*block*><*font=Times New Roman Bold " "Italic,size=10,color=804040*>Molecular\nEngineering<*/*>")->setAlignment(Chart::BottomRight ); // Output the chart c->makeChart("enhancedarea.jpg"); //free up resources delete c; return 0; }