Switch IGraphics DrawScale using a radio button

IPlugEffect.cpp

#include "IPlugEffect.h"
#include "IPlug_include_in_plug_src.h"
#include "IControls.h"


IPlugEffect::IPlugEffect(const InstanceInfo& info)
: Plugin(info, MakeConfig(kNumParams, kNumPresets))
{
  GetParam(kGain)->InitDouble("Gain", 0., 0., 100.0, 0.01, "%");

#if IPLUG_EDITOR // http://bit.ly/2S64BDd
  mMakeGraphicsFunc = [&]() {
    return MakeGraphics(*this, PLUG_WIDTH, PLUG_HEIGHT, PLUG_FPS, GetScaleForScreen(PLUG_WIDTH, PLUG_HEIGHT));
  };

  mLayoutFunc = [&](IGraphics* pGraphics) {
    pGraphics->SetLayoutOnResize(true);
    pGraphics->AttachPanelBackground(COLOR_GRAY);
    pGraphics->LoadFont("Roboto-Regular", ROBOTO_FN);
    const IRECT b = pGraphics->GetBounds();
    
    float currentScaleSelection = pGraphics->GetDrawScale() - 0.5f;
    pGraphics->AttachControl(new IVRadioButtonControl(b.GetCentredInside(100),
                                                      [pGraphics](IControl* pCaller) {
                                                        int idx = pCaller->As<IVRadioButtonControl>()->GetSelectedIdx();
                                                        float newScale = 0.5f + float(idx) * 0.5f;
                                                        pGraphics->Resize(PLUG_WIDTH, PLUG_HEIGHT, newScale);
                                                      },
                                                      {"Small", "Medium", "Big"} ))->SetValue(currentScaleSelection);
  };
#endif
}