private updateTemperature()

in sim/visuals/microbit.ts [538:608]
64 lines of code
12 McCabe index (conditional complexity)

        private updateTemperature() {
            let state = this.board;
            if (!state || !state.thermometerState.usesTemperature) return;

            let tmin = -5;
            let tmax = 50;
            if (!this.thermometer) {
                let gid = "gradient-thermometer";
                this.thermometerGradient = svg.linearGradient(this.defs, gid);
                this.thermometer = <SVGRectElement>svg.child(this.g, "rect", {
                    class: "sim-thermometer no-drag",
                    x: 120,
                    y: 110,
                    width: 20,
                    height: 160,
                    rx: 5, ry: 5,
                    fill: `url(#${gid})`
                });
                this.thermometerText = svg.child(this.g, "text", { class: 'sim-text', x: 58, y: 130 }) as SVGTextElement;
                if (this.props.runtime)
                    this.props.runtime.environmentGlobals[pxsim.localization.lf("temperature")] = state.thermometerState.temperature;
                this.updateTheme();

                let pt = this.element.createSVGPoint();
                svg.buttonEvents(this.thermometer,
                    // move
                    (ev) => {
                        let cur = svg.cursorPoint(pt, this.element, ev);
                        let t = Math.max(0, Math.min(1, (260 - cur.y) / 140))
                        state.thermometerState.temperature = Math.floor(tmin + t * (tmax - tmin));
                        this.updateTemperature();
                    },
                    // 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.thermometerState.temperature--;
                            if (state.thermometerState.temperature < -5) {
                                state.thermometerState.temperature = 50;
                            }
                            this.updateTemperature();
                        } else if (charCode === 38 || charCode === 39) { // Up/Right arrow
                            state.thermometerState.temperature++;
                            if (state.thermometerState.temperature > 50) {
                                state.thermometerState.temperature = -5;
                            }
                            this.updateTemperature();
                        }
                    })

                accessibility.makeFocusable(this.thermometer);
                accessibility.setAria(this.thermometer, "slider", pxsim.localization.lf("Thermometer"));
                this.thermometer.setAttribute("aria-valuemin", "-5");
                this.thermometer.setAttribute("aria-valuemax", "50");
                this.thermometer.setAttribute("aria-orientation", "vertical");
                this.thermometer.setAttribute("aria-valuenow", "21");
                this.thermometer.setAttribute("aria-valuetext", "21°C");
            }

            let t = Math.max(tmin, Math.min(tmax, state.thermometerState.temperature))
            let per = Math.floor((state.thermometerState.temperature - tmin) / (tmax - tmin) * 100)
            svg.setGradientValue(this.thermometerGradient, 100 - per + "%");
            this.thermometerText.textContent = t + "°C";
            this.thermometer.setAttribute("aria-valuenow", t.toString());
            this.thermometer.setAttribute("aria-valuetext", t + "°C");
            accessibility.setLiveContent(t + "°C");
        }