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36 lines
1.5 KiB
Markdown
36 lines
1.5 KiB
Markdown
[Back to JKQTPlotter main page](../../README.md)
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# JKQtPlotter
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## `QImage` as a Graph
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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.
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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:
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```c++
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// 2. now we open a BMP-file and load it into an OpenCV cv::Mat
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QImage image(":/example.bmp");
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// 3. create a graph (JKQTPImage) with a pointer to the QImage-object, generated above
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JKQTPImage* graph=new JKQTPImage(&plot);
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graph->set_title("");
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// copy the image into the graph (optionally you could also give a pointer to a QImage,
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// but then you need to ensure that the QImage is available as long as the JKQTPImage
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// instace lives)
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graph->set_image(image);
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// where does the image start in the plot, given in plot-axis-coordinates (bottom-left corner)
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graph->set_x(0);
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graph->set_y(0);
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// width/height of the image in plot coordinates
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graph->set_width(image.width());
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graph->set_height(image.height());
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// 4. add the graphs to the plot, so it is actually displayed
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plot.addGraph(graph);
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```
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The result looks like this:
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[Back to JKQTPlotter main page](../../README.md)
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