How to plot functions

arcathrax · 6 March 2025 09:50

How can i plot functions like for ex. f(x)=x*2? Is there a simple way for this? I’m currently trying to create a plot for my waveshaper.

daniel · 22 April 2025 09:30

You could have a look at the equalizer example. There is a PlotView for each frequency response.

Basically inherit from MagicPlotSource and put an instance into the magicState.
When you add a Plot to the GUI, you can select that plot source.
The view will call repeatedly for a path to draw.
It is best to cache that path object and only recalculate it when necessary.

This is where the EqualizerExample adds the plots:

github.com

ffAudio/foleys_gui_magic/blob/main/Examples/EqualizerExample/Source/PluginProcessor.cpp#L120


      
          #endif
              treeState (*this, nullptr, JucePlugin_Name, createParameterLayout()),
              gainAttachment (treeState, gain, IDs::paramOutput)
          {
              FOLEYS_SET_SOURCE_PATH (__FILE__);
          
              // GUI MAGIC: add plots to be displayed in the GUI
              for (size_t i = 0; i < attachments.size(); ++i)
              {
                  auto name = "plot" + juce::String (i + 1);
                  magicState.createAndAddObject<foleys::MagicFilterPlot> (name);
                  attachments.at (i)->postFilterUpdate = createPostUpdateLambda (magicState, name);
              }
          
              plotSum = magicState.createAndAddObject<foleys::MagicFilterPlot> ("plotSum");
          
              // GUI MAGIC: add analyser plots
              inputAnalyser  = magicState.createAndAddObject<foleys::MagicAnalyser> ("input");
              outputAnalyser = magicState.createAndAddObject<foleys::MagicAnalyser> ("output");
          
              // MAGIC GUI: add a meter at the output

Hope that helps