private updateSoundLevel()

in sim/visuals/board.ts [663:726]
60 lines of code
12 McCabe index (conditional complexity)

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

            if (!this.soundLevelButton) {
                let gid = "gradient-sound-level";
                this.soundLevelGradient = svg.linearGradient(this.defs, gid)
                let cy = 165;
                let r = 10;
                this.soundLevelButton = svg.child(this.g, "circle", {
                    cx: `12px`, cy: `${cy}px`, r: `${r}px`,
                    class: 'sim-sound-level-button no-drag',
                    fill: `url(#${gid})`
                }) as SVGCircleElement;

                let pt = this.element.createSVGPoint();
                svg.buttonEvents(this.soundLevelButton,
                    // move
                    (ev) => {
                        let pos = svg.cursorPoint(pt, this.element, ev);
                        let rs = r / 2;
                        let level = Math.max(0, Math.min(255, Math.floor((pos.y - (cy - rs)) / (2 * rs) * 255)));
                        if (level != this.board.microphoneState.getLevel()) {
                            this.board.microphoneState.setLevel(255 - level);
                            this.applySoundLevel();
                        }
                    },
                    // start
                    ev => { },
                    // stop
                    ev => { },
                    // keydown
                    (ev) => {
                        let charCode = (typeof ev.which == "number") ? ev.which : ev.keyCode
                        if (charCode === 40 || charCode === 37) { // Down/Left arrow
                            if (this.board.microphoneState.getLevel() === 0) {
                                this.board.microphoneState.setLevel(255);
                            } else {
                                this.board.microphoneState.setLevel(this.board.microphoneState.getLevel() - 1);
                            }
                            this.applySoundLevel();
                        } else if (charCode === 38 || charCode === 39) { // Up/Right arrow
                            if (this.board.microphoneState.getLevel() === 255) {
                                this.board.microphoneState.setLevel(0);
                            } else {
                                this.board.microphoneState.setLevel(this.board.microphoneState.getLevel() + 1);
                            }
                            this.applySoundLevel();
                        }
                    });
                this.soundLevelText = svg.child(this.g, "text", { x: 23, y: cy + r - 3, text: '', class: 'sim-text' }) as SVGTextElement;
                this.updateTheme();

                accessibility.makeFocusable(this.soundLevelButton);
                accessibility.setAria(this.soundLevelButton, "slider", "Noise level");
                this.soundLevelButton.setAttribute("aria-valuemin", "0");
                this.soundLevelButton.setAttribute("aria-valuemax", "255");
                this.soundLevelButton.setAttribute("aria-orientation", "vertical");
                this.soundLevelButton.setAttribute("aria-valuenow", "128");
            }

            svg.setGradientValue(this.soundLevelGradient, Math.min(100, Math.max(0, Math.floor((255 - state.microphoneState.getLevel()) * 100 / 255))) + '%')
            this.soundLevelText.textContent = state.microphoneState.getLevel().toString();
        }