mirror of
https://github.com/jkriege2/JKQtPlotter.git
synced 2024-12-26 10:31:39 +08:00
36 lines
1.5 KiB
Markdown
36 lines
1.5 KiB
Markdown
[Back to JKQTPlotter main page](../../README.md)
|
|
|
|
# JKQtPlotter
|
|
|
|
## `QImage` as a Graph
|
|
This project (see `./examples/simpletest_rgbimageplot_qt/`) simply creates a JKQtPlotter widget (as a new window) and adds an image plot with an image taken from a [QImage](http://doc.qt.io/qt-5/qimage.html) object.
|
|
|
|
The source code of the main application is (see [`jkqtplotter_simpletest_rgbimageplot_qt.cpp`](../simpletest_rgbimageplot_qt/jkqtplotter_simpletest_rgbimageplot_qt.cpp). the main parts are:
|
|
```c++
|
|
// 2. now we open a BMP-file and load it into an OpenCV cv::Mat
|
|
QImage image(":/example.bmp");
|
|
|
|
// 3. create a graph (JKQTPImage) with a pointer to the QImage-object, generated above
|
|
JKQTPImage* graph=new JKQTPImage(&plot);
|
|
graph->set_title("");
|
|
// copy the image into the graph (optionally you could also give a pointer to a QImage,
|
|
// but then you need to ensure that the QImage is available as long as the JKQTPImage
|
|
// instace lives)
|
|
graph->set_image(image);
|
|
// where does the image start in the plot, given in plot-axis-coordinates (bottom-left corner)
|
|
graph->set_x(0);
|
|
graph->set_y(0);
|
|
// width/height of the image in plot coordinates
|
|
graph->set_width(image.width());
|
|
graph->set_height(image.height());
|
|
|
|
// 4. add the graphs to the plot, so it is actually displayed
|
|
plot.addGraph(graph);
|
|
```
|
|
The result looks like this:
|
|
|
|
|
|
|
|
|
|
[Back to JKQTPlotter main page](../../README.md)
|