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53 lines
2.8 KiB
Markdown
53 lines
2.8 KiB
Markdown
# Example (JKQTPlotter): Line Graph with Different Symbols and Line Styles {#JKQTPlotterSymbolsAndStyles}
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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.
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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:
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```.cpp
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QVector<Qt::PenStyle> pens {Qt::NoPen, Qt::SolidLine, Qt::DashLine, Qt::DotLine, Qt::DashDotLine, Qt::DashDotDotLine };
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int ipen=0;
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for (int symbolID=0; symbolID<=JKQTPMaxSymbolID; symbolID++) {
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// generate some plot data
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QVector<double> Y;
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for (auto& xx: X) {
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Y<<sin(xx)+static_cast<double>(symbolID)*1.5;
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}
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JKQTPXYLineGraph* graph=new JKQTPXYLineGraph(&plot);
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// copy data into datastore and immediately set the yColumn
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graph->setXColumn(columnX);
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graph->setYColumn(ds->addCopiedColumn(Y, "y"+QString::number(symbolID)));
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// set symbol + pen style and color
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graph->setSymbolType(static_cast<JKQTPGraphSymbols>(symbolID));
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graph->setLineStyle(pens[ipen]);
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// set symbol size
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graph->setSymbolSize(14);
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// set width of symbol lines
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graph->setSymbolLineWidth(1.5);
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// set width of graph line
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graph->setLineWidth(1);
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// graph title is made from symbol+penstyle
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graph->setTitle(JKQTPGraphSymbols2NameString(static_cast<JKQTPGraphSymbols>(graph->getSymbolType()))+QString(", ")+jkqtp_QPenStyle2String(graph->getLineStyle()));
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// add the graph to the plot, so it is actually displayed
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plot.addGraph(graph);
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ipen++;
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if (ipen>=pens.size()) ipen=0;
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}
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```
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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)`.
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Note: There are additional, more advanced options for styling the graphs. See the example [Advanced Line and Fill Styling](@ref JKQTPlotterAdvancedLineAndFillStyling) for details.
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The result looks like this:
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