ChartDirector 6.0 (C++ Edition)

Rotated Area Chart

This example demonstrates swapping the x and y axes to produce an rotated area chart in which the area goes from left to right (instead of bottom to top).

The x and y axes in the example are configured as follows:

• Initially, the x-axis is horizontal from left to right at the bottom of the plot area, while the y-axis is vertical from bottom to top at the left side of the plot area.

• Swap the x and y axes using XYChart.swapXY. Now the x-axis is vertical from bottom to top at the left side of the chart, while the y-axis is horizontal from left to right at the bottom of the chart.

• Use XYChart.setYAxisOnRight to move the y-axis to the opposite side of the plot area, so that the y-axis is at the top of the plot area. (Note: the "right" word on setYAxisOnRight means the "right" side before "swapXY" rotation. After rotation, the right side will become to top side.)

• Use Axis.setReverse to reverse the direction of the x-axis, so that the x-axis is vertical from top to bottom (instead of from bottom to top).
The area in this chart is filled using a gradient color created with BaseChart.gradientColor.

Source Code Listing

[The following code is available in "cppdemo/rotatedarea". A MFC version of the code is available in "mfcdemo/mfcdemo" (Windows edition only). A QT version of the code is available in "qtdemo/qtdemo".]
 ```#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}; // The labels for the area chart double 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}; // Create a XYChart object of size 320 x 320 pixels XYChart *c = new XYChart(320, 320); // Swap the x and y axis to become a rotated chart c->swapXY(); // Set the y axis on the top side (right + rotated = top) c->setYAxisOnRight(); // Reverse the x axis so it is pointing downwards c->xAxis()->setReverse(); // Set the plotarea at (50, 50) and of size 200 x 200 pixels. Enable horizontal and vertical // grids by setting their colors to grey (0xc0c0c0). c->setPlotArea(50, 50, 250, 250)->setGridColor(0xc0c0c0, 0xc0c0c0); // Add a line chart layer using the given data c->addAreaLayer(DoubleArray(data, (int)(sizeof(data) / sizeof(data[0]))), c->gradientColor(50, 0, 300, 0, 0xffffff, 0x0000ff)); // Set the labels on the x axis. Append "m" after the value to show the unit. c->xAxis()->setLabels(DoubleArray(labels, (int)(sizeof(labels) / sizeof(labels[0]))), "{value} m"); // Display 1 out of 3 labels. c->xAxis()->setLabelStep(3); // Add a title to the x axis c->xAxis()->setTitle("Depth"); // Add a title to the y axis c->yAxis()->setTitle("Carbon Dioxide Concentration (ppm)"); // Output the chart c->makeChart("rotatedarea.png"); //free up resources delete c; return 0; }```