76 lines
2.8 KiB
C++
76 lines
2.8 KiB
C++
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// LedRing.hpp — Custom LED-ring widget encircling each output jack.
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//
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// The arc fills clockwise from 12 o'clock in proportion to the output's value
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// (0..1 → 0..2π) and is drawn on drawLayer() layer 1 (so it stays bright when
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// room brightness is lowered, per the VCV custom-light convention). A dim track
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// ring sits underneath. Colour comes from the frontend design tokens
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// (palette.hpp) so the module matches the browser.
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//
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// Templated on the module type so it can read the per-output value without a
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// hard include cycle; MEMLNaut.cpp instantiates LedRingWidget<MEMLNaut>.
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#pragma once
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#include <rack.hpp>
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#include "palette.hpp"
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using namespace rack;
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template<typename TModule>
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struct LedRingWidget : Widget {
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TModule* module = nullptr;
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int outIdx = 0;
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NVGcolor ringColor = memlnaut::palette::accent();
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float radius = 9.f; // px around a PJ301M jack
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LedRingWidget() {
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// Box large enough to host the ring around a ~22px jack.
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box.size = Vec(radius * 2.f + 6.f, radius * 2.f + 6.f);
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}
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float valueOf() const {
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if (!module) return 0.f;
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return clamp(module->ringValue(outIdx), 0.f, 1.f);
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}
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void drawLayer(const DrawArgs& args, int layer) override {
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if (layer != 1) {
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Widget::drawLayer(args, layer);
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return;
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}
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float v = valueOf();
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Vec c = box.size.div(2.f);
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const float start = -M_PI / 2.f; // 12 o'clock
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const float end = start + 2.f * M_PI; // full circle
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// Dim track ring (full circle).
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nvgBeginPath(args.vg);
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nvgArc(args.vg, c.x, c.y, radius, start, end, NVG_CW);
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nvgStrokeColor(args.vg, nvgRGBA((unsigned char)(ringColor.r * 255),
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(unsigned char)(ringColor.g * 255),
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(unsigned char)(ringColor.b * 255), 40));
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nvgStrokeWidth(args.vg, 1.4f);
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nvgStroke(args.vg);
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// Proportional value arc.
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if (v > 0.001f) {
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nvgBeginPath(args.vg);
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nvgArc(args.vg, c.x, c.y, radius, start, start + v * 2.f * M_PI, NVG_CW);
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nvgStrokeColor(args.vg, ringColor);
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nvgStrokeWidth(args.vg, 1.9f);
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nvgLineCap(args.vg, NVG_ROUND);
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nvgStroke(args.vg);
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// Soft glow halo — the frontend "glow not shadow" signature.
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nvgGlobalCompositeOperation(args.vg, NVG_LIGHTER);
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nvgBeginPath(args.vg);
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nvgArc(args.vg, c.x, c.y, radius, start, start + v * 2.f * M_PI, NVG_CW);
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nvgStrokeColor(args.vg, nvgRGBAf(ringColor.r, ringColor.g, ringColor.b, 0.25f * v));
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nvgStrokeWidth(args.vg, 4.0f);
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nvgStroke(args.vg);
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nvgGlobalCompositeOperation(args.vg, NVG_SOURCE_OVER);
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}
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Widget::drawLayer(args, layer);
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}
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};
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