pxt-calliope/libs/microbit/led.ts

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//% color=3 weight=35
namespace led {
/**
* Displays a vertical bar graph based on the ``value`` and ``high`` value.
* @param value current value to plot
* @param high maximum value, eg: 1023, 255
*/
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//% help=/led/plot-bar-graph weight=20
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//% blockId=device_plot_bar_graph block="plot bar graph of %value |up to %high" icon="\uf080" blockExternalInputs=true
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export function plotBarGraph(value: number, high: number): void {
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serial.writeString(value.toString() + "\r\n");
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let v = Math.abs((value * 15) / high);
let k = 0;
for(let y = 4; y >= 0; --y) {
for (let x = 0; x < 3; ++x) {
if (k > v) {
unplot(2-x,y);
unplot(2+x,y);
} else {
plot(2-x, y);
plot(2+x, y);
}
++k;
}
}
}
/**
* Toggles a particular pixel
* @param x TODO
* @param y TODO
*/
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//% help=led/toggle
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export function toggle(x: number, y: number): void {
if (led.point(x, y)) {
led.unplot(x, y);
} else {
led.plot(x, y);
}
}
/**
* Turns all LEDS on
*/
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//% help=led/plot-all
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export function plotAll(): void {
for (let i = 0; i < 5; i++) {
for (let j = 0; j < 5; j++) {
led.plot(i, j);
}
}
}
/**
* Inverts the current LED display
*/
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//% help=led/toggle-all
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export function toggleAll(): void {
for (let i = 0; i < 5; i++) {
for (let j = 0; j < 5; j++) {
led.toggle(i, j);
}
}
}
/**
* Fades in the screen display.
* @param ms TODO
*/
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//% help=led/fade-in
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export function fadeIn(ms: number = 700): void {
if (ms < 20) {
led.setBrightness(255);
return;
}
let dt = 50;
let brightness = led.brightness();
let start = input.runningTime();
let elapsed = 0;
while (elapsed < ms) {
led.setBrightness(brightness + ((255 - brightness) * elapsed) / ms);
basic.pause(dt);
elapsed = input.runningTime() - start;
}
led.setBrightness(255);
}
/**
* Fades out the screen brightness.
* @param ms TODO
*/
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//% help=led/fade-out
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export function fadeOut(ms: number = 700): void {
if (ms < 20) {
led.setBrightness(0);
return;
}
let brightness = led.brightness();
let dt = 50;
let start = input.runningTime();
let elapsed = 0;
while (elapsed < ms) {
led.setBrightness(brightness - (brightness * elapsed) / ms);
basic.pause(dt);
elapsed = input.runningTime() - start;
}
led.setBrightness(0);
}
}