Function onDisplay

examples/Parameters/ExampleUIParameters.cpp:106–177

The OpenGL drawing function. This UI will draw a 3x3 grid, with on/off states according to plugin parameters. */

      This UI will draw a 3x3 grid, with on/off states according to plugin parameters.
    */
    void onDisplay() override
    {
        const GraphicsContext& context(getGraphicsContext());

        const uint width = getWidth();
        const uint height = getHeight();
        const uint minwh = std::min(width, height);
        const uint bgColor = getBackgroundColor();

        Rectangle<double> r;

        // if host doesn't respect aspect-ratio but supports ui background, draw out-of-bounds color from it
        if (width != height && bgColor != 0)
        {
            const int red   = (bgColor >> 24) & 0xff;
            const int green = (bgColor >> 16) & 0xff;
            const int blue  = (bgColor >>  8) & 0xff;
            Color(red, green, blue).setFor(context);

            if (width > height)
            {
                r.setPos(height, 0);
                r.setSize(width-height, height);
            }
            else
            {
                r.setPos(0, width);
                r.setSize(width, height-width);
            }

            r.draw(context);
        }

        r.setWidth(minwh/3 - 6);
        r.setHeight(minwh/3 - 6);

        // draw left, center and right columns
        for (int i=0; i<3; ++i)
        {
            r.setX(3 + i*minwh/3);

            // top
            r.setY(3);

            if (fParamGrid[0+i])
                Color(0.8f, 0.5f, 0.3f).setFor(context);
            else
                Color(0.3f, 0.5f, 0.8f).setFor(context);

            r.draw(context);

            // middle
            r.setY(3 + minwh/3);

            if (fParamGrid[3+i])
                Color(0.8f, 0.5f, 0.3f).setFor(context);
            else
                Color(0.3f, 0.5f, 0.8f).setFor(context);