mirror of
https://github.com/jkriege2/JKQtPlotter.git
synced 2024-12-27 03:00:55 +08:00
117 lines
6.4 KiB
Markdown
117 lines
6.4 KiB
Markdown
[Back to JKQTPlotter main page](https://github.com/jkriege2/JKQtPlotter/)
|
|
|
|
# JKQtPlotter
|
|
|
|
## Scatter Graph with Parametrized Symbols/Colors
|
|
This project (see `./test/simpletest_paramscatterplot/`) demonstrates the capabilities of `JKQTPxyParametrizedScatterGraph`. This graph class plots symbol&line-graphs, juts like [`JKQTPxyLineGraph`](https://github.com/jkriege2/JKQtPlotter/blob/master/test/simpletest_symbols_and_styles/) and in addition modifies several properties of each plot point by data from an additional column. These properties can be modified:
|
|
- symbol size
|
|
- symbol type
|
|
- symbol/line color
|
|
- line width
|
|
|
|
The source code of the main application can be found in [`jkqtplotter_simpletest_paramscatterplot.cpp`](https://github.com/jkriege2/JKQtPlotter/blob/master/test/simpletest_paramscatterplot/jkqtplotter_simpletest_paramscatterplot.cpp). First, several datasets are generated and added to the internal datastore. the resulting datatable looks like this:
|
|
|
|
|
|
|
|
Then several plots are added that modify different properties.
|
|
|
|
The simplest case is to modify the symbol type. Simply set the property `symbolColumn` with `graph1->set_symbolColumn(columnP)` to a data column. The values in the data column will be cast to an integer and then will be translated to `JKQTPgraphSymbols`. If the numbers are larger than the available symbol types in `JKQTPgraphSymbols`, the graph will cycle through the available symbols (via a modulo-operation with the max. symbol count!).
|
|
```c++
|
|
JKQTPxyParametrizedScatterGraph* graph1=new JKQTPxyParametrizedScatterGraph(&plot);
|
|
graph1->set_xColumn(columnX);
|
|
graph1->set_yColumn(columnY1);
|
|
graph1->set_symbolColumn(columnP);
|
|
graph1->set_drawLine(true);
|
|
graph1->set_color(QColor("blueviolet"));
|
|
graph1->set_title("1: symbol type");
|
|
plot.addGraph(graph1);
|
|
```
|
|
|
|
|
|
The next two code snippets show how to modify the size of the symbols and the line width of the lines, connecting the symbols (ensure to set `graph6->set_drawLine(true)`, because otherwise no line will be drawn). The principle is the same as above, but here you need to set the properties `sizeColumn` for the symbol size and `linewidthColumn` for the line width. All values in the line width or symbol size columns are interpreted as sizes in dtp points (pt)!
|
|
```c++
|
|
// symbol size
|
|
JKQTPxyParametrizedScatterGraph* graph3=new JKQTPxyParametrizedScatterGraph(&plot);
|
|
graph3->set_xColumn(columnX);
|
|
graph3->set_yColumn(columnY3);
|
|
graph3->set_sizeColumn(columnS);
|
|
graph3->set_symbol(JKQTPfilledCircle);
|
|
graph3->set_drawLine(true);
|
|
graph3->set_title("3: symbol size");
|
|
plot.addGraph(graph3);
|
|
|
|
// line width
|
|
JKQTPxyParametrizedScatterGraph* graph6=new JKQTPxyParametrizedScatterGraph(&plot);
|
|
graph6->set_xColumn(columnX);
|
|
graph6->set_yColumn(columnY6);
|
|
graph6->set_linewidthColumn(columnLW);
|
|
graph6->set_drawLine(true);
|
|
graph6->set_symbol(JKQTPnoSymbol);
|
|
graph6->set_title("6: line width");
|
|
plot.addGraph(graph6);
|
|
```
|
|
|
|
|
|
Finally you can set the color of each symbol, based on data in the column `colorColumn`. Here two possibilities exist: First you can store the RGB(A) value for each datapoint explicitly. For this, you first need to create the data in the column, using the Qt-function [`qRgb()`](http://doc.qt.io/qt-5/qcolor.html#qRgb) or [`qRgba()`}(http://doc.qt.io/qt-5/qcolor.html#qRgba):
|
|
```c++
|
|
QVector<double> RGB;
|
|
const int Ndata=10; // number of plot points in each curve
|
|
for (int i=0; i<Ndata; i++) {
|
|
const double x=double(i)/double(Ndata)*2.0*M_PI;
|
|
RGB<<double(qRgb(double(i)/double(Ndata)*255,0,255-double(i)/double(Ndata)*255));
|
|
}
|
|
size_t columnRGB=ds->addCopiedColumn(RGB, "rgb");
|
|
```c++
|
|
Basically the data points in a RGB(A)-column will be interpreted by castig them to [`QRgb`](http://doc.qt.io/qt-5/qcolor.html#QRgb-typedef).
|
|
|
|
Now you can add the graph. In order to interpret the color column as RGB(A)-values, ensure to set `graph4->set_colorColumnContainsRGB(true)`:
|
|
```c++
|
|
JKQTPxyParametrizedScatterGraph* graph4=new JKQTPxyParametrizedScatterGraph(&plot);
|
|
graph4->set_xColumn(columnX);
|
|
graph4->set_yColumn(columnY4);
|
|
graph4->set_colorColumn(columnRGB);
|
|
graph4->set_colorColumnContainsRGB(true);
|
|
graph4->set_drawLine(true);
|
|
graph4->set_symbol(JKQTPfilledDownTriangle);
|
|
graph4->set_title("4: RGB-color");
|
|
plot.addGraph(graph4);
|
|
```
|
|
|
|
The second variant for setting the color of each datapoint is by mapping the values in the column to a color palette (`JKQTPMathImageRYGB` in this example). For this you simply need to define the color coumn and the palette to use. By default, the color palette spans the full range of values in `colorColumn`:
|
|
```c++
|
|
JKQTPxyParametrizedScatterGraph* graph2=new JKQTPxyParametrizedScatterGraph(&plot);
|
|
graph2->set_xColumn(columnX);
|
|
graph2->set_yColumn(columnY2);
|
|
graph2->set_colorColumn(columnC);
|
|
graph2->set_palette(JKQTPMathImageRYGB);
|
|
graph2->set_symbol(JKQTPfilledRect);
|
|
graph2->set_drawLine(true);
|
|
graph2->set_title("2: color");
|
|
graph2->get_colorBarRightAxis()->set_axisLabel("color scale for graph2");
|
|
plot.addGraph(graph2);
|
|
```
|
|
Note: If you want to set the range manually, use `ste_imageMin()` and `set_imageMax()` after setting `set_autoImageRange(false)`.
|
|
|
|
|
|
Note also that it is possible to combine any of parametrizations above in a single graph, by setting two or more columns:
|
|
```c++
|
|
JKQTPxyParametrizedScatterGraph* graph5=new JKQTPxyParametrizedScatterGraph(&plot);
|
|
graph5->set_xColumn(columnX);
|
|
graph5->set_yColumn(columnY5);
|
|
graph5->set_colorColumn(columnC);
|
|
graph5->set_sizeColumn(columnS);
|
|
graph5->set_palette(JKQTPMathImageBLUEYELLOW);
|
|
graph5->set_drawLine(true);
|
|
graph5->set_title("5: color+size");
|
|
graph5->get_colorBarRightAxis()->set_axisLabel("color scale for graph5");
|
|
plot.addGraph(graph5);
|
|
```
|
|
|
|
|
|
The full test appication combines all these variants and the result looks like this:
|
|
|
|
|
|
|
|
|
|
|
|
[Back to JKQTPlotter main page](https://github.com/jkriege2/JKQtPlotter/) |