private updateSoundLevel()

in sim/visuals/microbit.ts [610:675]
59 lines of code
10 McCabe index (conditional complexity)

        private updateSoundLevel() {
            let state = this.board;
            if (!state || !state.microphoneState.sensorUsed) return;

            const tmin = 0 // state.microphoneState.min;
            const tmax = 255 //state.microphoneState.max;
            if (!this.soundLevel) {
                const level = state.microphoneState.getLevel();
                let gid = "gradient-soundlevel";
                this.soundLevelGradient = svg.linearGradient(this.defs, gid);
                this.soundLevel = <SVGRectElement>svg.child(this.g, "rect", {
                    class: "sim-thermometer no-drag",
                    x: 360,
                    y: 110,
                    width: 20,
                    height: 160,
                    rx: 5, ry: 5,
                    fill: `url(#${gid})`
                });
                this.soundLevelText = svg.child(this.g, "text", { class: 'sim-text', x: 370, y: 90 }) as SVGTextElement;
                if (this.props.runtime)
                    this.props.runtime.environmentGlobals[pxsim.localization.lf("sound level")] = state.microphoneState.getLevel();
                this.updateTheme();

                let pt = this.element.createSVGPoint();
                svg.buttonEvents(this.soundLevel,
                    // move
                    (ev) => {
                        let cur = svg.cursorPoint(pt, this.element, ev);
                        let t = Math.max(0, Math.min(1, (260 - cur.y) / 140))
                        state.microphoneState.setLevel(Math.floor(tmin + t * (tmax - tmin)));
                        this.updateMicrophone();
                    },
                    // start
                    ev => { },
                    // stop
                    ev => { },
                    // keydown
                    (ev) => {
                        let charCode = (typeof ev.which == "number") ? ev.which : ev.keyCode
                        if (charCode === 40 || charCode === 37) { // Down/Left arrow
                            state.microphoneState.setLevel(state.microphoneState.getLevel() - 1);
                            this.updateMicrophone();
                        } else if (charCode === 38 || charCode === 39) { // Up/Right arrow
                            state.microphoneState.setLevel(state.microphoneState.getLevel() + 1)
                            this.updateMicrophone();
                        }
                    })

                accessibility.makeFocusable(this.soundLevel);
                accessibility.setAria(this.soundLevel, "slider", pxsim.localization.lf("Sound Level"));
                this.soundLevel.setAttribute("aria-valuemin", tmin + "");
                this.soundLevel.setAttribute("aria-valuemax", tmax + "");
                this.soundLevel.setAttribute("aria-orientation", "vertical");
                this.soundLevel.setAttribute("aria-valuenow", level + "");
                this.soundLevel.setAttribute("aria-valuetext", level + "");
            }

            let t = Math.max(tmin, Math.min(tmax, state.microphoneState.getLevel()))
            let per = Math.floor((state.microphoneState.getLevel() - tmin) / (tmax - tmin) * 100)
            svg.setGradientValue(this.soundLevelGradient, (100 - per) + "%");
            this.soundLevelText.textContent = t + "";
            this.soundLevel.setAttribute("aria-valuenow", t.toString());
            this.soundLevel.setAttribute("aria-valuetext", t + "");
            accessibility.setLiveContent(t + "");
        }