mirror of
https://github.com/jkriege2/JKQtPlotter.git
synced 2024-11-16 02:25:50 +08:00
2d08250db6
- fixed additional renames JKQTPLotter->JKQTPlotter - improved documentation (boxplots, JKQTMathText) - added several examples
54 lines
2.8 KiB
Markdown
54 lines
2.8 KiB
Markdown
# Example (JKQTPlotter): Step Line Plots in Different Styles {#JKQTPlotterStepPlot}
|
|
This project (see `./examples/simpletest_stepplots/`) simply creates a JKQTPlotter widget (as a new window) and adds a single line-graph (a sine-wave). Data is initialized from two QVector<double> objects.
|
|
|
|
The source code of the main application can be found in [`jkqtplotter_simpletest_stepplots.cpp`](../simpletest_stepplots/jkqtplotter_simpletest_stepplots.cpp). For the most part, several datasets of cosine-curves are generated. then thrre tuples of graphs are added: One of type `JKQTPXYLineGraph`, which simply indicates the location of the actual datapoints. the second is of type `JKQTPStepHorizontalGraph`, which adds the step-graph to the plot:
|
|
|
|
```.cpp
|
|
// 3 now we make several plots with different step styles, each one also contains a
|
|
// symbol plot indicating the location of the datapoints themselves
|
|
JKQTPStepHorizontalGraph* graph;
|
|
JKQTPXYLineGraph* graphL;
|
|
|
|
//-- JKQTPStepLeft ----------------------------------------------------------------------------------------
|
|
graph=new JKQTPStepHorizontalGraph(&plot);
|
|
graphL=new JKQTPXYLineGraph(&plot);
|
|
|
|
// set data for both graphs
|
|
graph->set_xColumn(columnX); graphL->set_xColumn(graph->get_xColumn());
|
|
graph->set_yColumn(columnY1); graphL->set_yColumn(graph->get_yColumn());
|
|
|
|
// set step style
|
|
graph->set_stepType(JKQTPStepLeft);
|
|
graph->set_lineWidth(1);
|
|
graph->set_fillCurve(true);
|
|
graph->set_drawLine(true);
|
|
graph->set_title("JKQTPStepLeft, filled");
|
|
```
|
|
Note that you can configure the step type (left/center/right by `graph->set_stepType(JKQTPStepLeft)`. With `graph->set_fillCurve(true)` you can draw the curve filled until the y=0-axis and with `graph->set_drawLine(true)` you can switch the line along the values on and off (e.g. to only have the filled area, but no line).
|
|
|
|
Finally the `JKQTPXYLineGraph` is configured:
|
|
```.cpp
|
|
// set symbol + pen style and color for the added circles, copy color
|
|
graphL->set_symbol(JKQTPGraphSymbols::JKQTPCircle);
|
|
graphL->set_drawLine(false);
|
|
graphL->set_symbolSize(9);
|
|
graphL->set_symbolWidth(1);
|
|
graphL->set_color(graph->get_color());
|
|
```
|
|
|
|
... and all graphs are added to the plot:
|
|
```.cpp
|
|
// add the graphs to the plot, so it is actually displayed
|
|
plot.addGraph(graph);
|
|
plot.addGraph(graphL);
|
|
```
|
|
|
|
In addition to the symbol type and line style, you can also alter the size of the symbols (`graph->set_symbolSize(14)`), the line-width used to draw them (`graph->set_symbolWidth(1.5)`) and the line width of the graph line (`graph->set_lineWidth(1)`). If you want to switch off the line altogether, use `graph->set_drawLine(false`.
|
|
|
|
The result looks like this:
|
|
|
|
|
|
|
|
|
|
|