BipolarSliderLAF.cpp

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#include "BipolarSliderLAF.h"
 
namespace krotos
{
    void BipolarSliderLAF::drawLinearSlider(Graphics& g, int x, int y, int width, int height, float sliderPos,
                                            float /*minSliderPos*/, float /*maxSliderPos*/,
                                            const Slider::SliderStyle /*style*/, Slider& /*slider*/)
    {
        // juce::LookAndFeel_V4::drawLinearSlider which draws outwards.
        const Colour trackBackgroundColour(0x1AFFFFFF); // white, 0.1 opacity
        const Colour trackColour(0x66FFFFFF);           // white, 0.4 opacity
        const Colour thumbColour(0xFFFFFFFF);           // white
        const Colour centreMarkerColour(0xFF000000);    // black
 
        // paint background track
        const int trackHeight(6);
        const float trackY = ((float)y + (float)height * 0.5f);
        Point<float> startPoint((float)x, trackY);
        Point<float> endPoint((float)(width + x), trackY);
        Path backgroundTrack;
        backgroundTrack.startNewSubPath(startPoint);
        backgroundTrack.lineTo(endPoint);
        g.setColour(trackBackgroundColour);
        g.strokePath(backgroundTrack, {trackHeight, PathStrokeType::curved, PathStrokeType::rounded});
 
        // paint track
        Point<float> maxPoint, negativeMaxPoint;
        maxPoint = {sliderPos, trackY};
        Path valueTrack;
        valueTrack.startNewSubPath(maxPoint);
        g.setColour(trackColour);
        valueTrack.lineTo(width + (x * 2.0f) - sliderPos, trackY);
        g.strokePath(valueTrack, {trackHeight, PathStrokeType::curved, PathStrokeType::rounded});
 
        // paint centre marker
        const float middleMarkerWidth(2.0);
        const float middleX((float)x + (float)width * 0.5f);
        g.setColour(centreMarkerColour);
        const float lineHeight((float)trackHeight * 2.0f);
        g.fillRect(/*x*/ middleX - (middleMarkerWidth * 0.5f) + 0.5f, /*y*/ 6.0f, middleMarkerWidth, lineHeight);
        // nb: adding 0.5f to the X to put it between pixels, resulting in a crispier line
 
        // paint white circle thumb
        const int thumbWidth(8);
        g.setColour(thumbColour);
        g.fillEllipse(
                Rectangle<float>(static_cast<float>(thumbWidth), static_cast<float>(thumbWidth)).withCentre(maxPoint));
    }
} // namespace krotos