mirror of
https://github.com/jkriege2/JKQtPlotter.git
synced 2024-11-15 18:15:52 +08:00
53 lines
2.8 KiB
Markdown
53 lines
2.8 KiB
Markdown
# Example (JKQTPlotter): Line Graph with Different Symbols and Line Styles {#JKQTPlotterSymbolsAndStyles}
|
|
This project (see `./examples/symbols_and_styles/`) 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 [`symbols_and_styles.cpp`](https://github.com/jkriege2/JKQtPlotter/tree/master/examples/symbols_and_styles/symbols_and_styles.cpp). Mainly several graphs are generated in a loop and then different symbol and line styles are applied to the graph (set by `graph->setSymbolType()` for the symbol and `graph->setLineStyle()` for the line style). The colors are set automtically from an internal default palette. The main loop looks like this:
|
|
|
|
```.cpp
|
|
QVector<Qt::PenStyle> pens {Qt::NoPen, Qt::SolidLine, Qt::DashLine, Qt::DotLine, Qt::DashDotLine, Qt::DashDotDotLine };
|
|
int ipen=0;
|
|
for (int symbolID=0; symbolID<=JKQTPMaxSymbolID; symbolID++) {
|
|
// generate some plot data
|
|
QVector<double> Y;
|
|
for (auto& xx: X) {
|
|
Y<<sin(xx)+static_cast<double>(symbolID)*1.5;
|
|
}
|
|
|
|
JKQTPXYLineGraph* graph=new JKQTPXYLineGraph(&plot);
|
|
|
|
// copy data into datastore and immediately set the yColumn
|
|
graph->setXColumn(columnX);
|
|
graph->setYColumn(ds->addCopiedColumn(Y, "y"+QString::number(symbolID)));
|
|
|
|
// set symbol + pen style and color
|
|
graph->setSymbolType(static_cast<JKQTPGraphSymbols>(symbolID));
|
|
graph->setLineStyle(pens[ipen]);
|
|
// set symbol size
|
|
graph->setSymbolSize(14);
|
|
// set width of symbol lines
|
|
graph->setSymbolLineWidth(1.5);
|
|
// set width of graph line
|
|
graph->setLineWidth(1);
|
|
|
|
// graph title is made from symbol+penstyle
|
|
graph->setTitle(JKQTPGraphSymbols2NameString(static_cast<JKQTPGraphSymbols>(graph->getSymbolType()))+QString(", ")+jkqtp_QPenStyle2String(graph->getLineStyle()));
|
|
|
|
// add the graph to the plot, so it is actually displayed
|
|
plot.addGraph(graph);
|
|
|
|
ipen++;
|
|
if (ipen>=pens.size()) ipen=0;
|
|
}
|
|
```
|
|
|
|
In addition to the symbol type and line style, you can also alter the size of the symbols (`graph->setSymbolSize(14)`), the line-width used to draw them (`graph->setSymbolLineWidth(1.5)`) and the line width of the graph line (`graph->setLineWidth(1)`). If you want to switch off the line altogether, use `graph->setDrawLine(false)`.
|
|
|
|
Note: There are additional, more advanced options for styling the graphs. See the example [Advanced Line and Fill Styling](@ref JKQTPlotterAdvancedLineAndFillStyling) for details.
|
|
|
|
The result looks like this:
|
|
|
|
|
|
|
|
|
|
|