Merge pull request #1398 from fbedussi/feature/barometer

feat: add barometer

apps/barometer/ChangeLog

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+0.01: Display pressure as number and hand

apps/barometer/app-icon.js

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+require("heatshrink").decompress(atob("mEwwhC/AH4AVmczmALI7oWJgYXBmYLHhvd6AuKGBHdAAYXLDAwXRJIvd73u9oXSLoPuAAJhHOwYYGIYIXDGAwWGMIYvMC5QwBC4ZeMC4x3KL44XEU6KQEC5gAMCqoXZAH4AchAXWxAXWwBGWC62IC6sILywXXxAXUhWqzAXTCwIABOyYXD0AXSCwQABC/4XaO68JC6wYCCygA/AH4AGA"))

apps/barometer/app.js

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+const center = {
+  x: g.getWidth()/2,
+  y: g.getHeight()/2,
+};
+
+const MIN = 940;
+const MAX = 1090;
+const NUMBER_OF_VALUES = MAX - MIN;
+const SCALE_TICK_STEP = 5;
+const SCALE_VALUES_STEP = 25;
+const NUMBER_OF_LABELS = NUMBER_OF_VALUES / SCALE_VALUES_STEP;
+const NUMBER_OF_TICKS = NUMBER_OF_VALUES / SCALE_TICK_STEP;
+const ZERO_OFFSET = (Math.PI / 4) * 3;
+const SCALE_SPAN = (Math.PI / 2) * 3;
+const TICK_LENGTH = 10;
+const HAND_LENGTH = 45;
+const HAND_WIDTH = 5;
+
+function generatePoly(radius, width, angle){
+  const x = center.x + Math.cos(angle) * radius;
+  const y = center.y + Math.sin(angle) * radius;
+  const d = {
+    x: width/2 * Math.cos(angle + Math.PI/2),
+    y: width/2 * Math.sin(angle + Math.PI/2),
+  };
+  
+  const poly = [center.x - d.x, center.y - d.y, center.x + d.x, center.y + d.y, x + d.x, y + d.y, x - d.x, y - d.y];
+  
+  return poly;
+}
+
+function drawHand(value){
+  g.setColor(256, 0, 0);
+  
+  g.setFontAlign(0,0);
+  g.setFont("Vector",15);
+  g.drawString(value, center.x, center.y * 2 - 15, true);
+
+  const angle = SCALE_SPAN / NUMBER_OF_VALUES * (value - MIN) + ZERO_OFFSET;
+  g.fillPoly(generatePoly(HAND_LENGTH, HAND_WIDTH, angle), true);
+  g.fillCircle(center.x ,center.y, 4);
+}
+
+
+function drawTicks(){
+  g.setColor(1,1,1);
+  for(let i= 0; i <= NUMBER_OF_TICKS; i++){
+    const angle = (i * (SCALE_SPAN/NUMBER_OF_TICKS)) + ZERO_OFFSET;
+
+    const tickWidth = i%5==0 ? 5 : 2;
+    g.fillPoly(generatePoly(center.x, tickWidth, angle), true);
+  }
+  
+  g.setColor(0,0,0);
+  g.fillCircle(center.x,center.y,center.x - TICK_LENGTH);
+}
+
+
+function drawScaleLabels(){
+  g.setColor(1,1,1);
+  g.setFont("Vector",12);
+
+  let label = MIN;
+  for (let i=0;i <= NUMBER_OF_LABELS; i++){
+    const angle = (i * (SCALE_SPAN/NUMBER_OF_LABELS)) + ZERO_OFFSET;
+    const labelDimensions = g.stringMetrics(label);
+
+    const LABEL_PADDING = 5;
+    const radius = center.x - TICK_LENGTH - LABEL_PADDING;
+    const x = center.x + Math.cos(angle) * radius;
+    const y = center.y + Math.sin(angle) * radius;
+
+    const visualX = x > center.x ? x - labelDimensions.width : x + labelDimensions.width > center.x ? x - (labelDimensions.width / 2) : x;
+    const visualY = y >= center.y - labelDimensions.height / 2 ? y - labelDimensions.height / 2 : y;
+
+    g.drawString(label, visualX, visualY);
+
+    label += SCALE_VALUES_STEP;
+  }
+}
+
+function drawIcons() {
+  const sunIcon = {
+    width : 24, height : 24, bpp : 4,
+    transparent : 0,
+    buffer : require("heatshrink").decompress(atob("AAkP+ALeA40PAYf/BYv/CYYLBBwIICCQ4ACHI4ICEIgkEAg48GDApcFAoYPBBY5NDBZIjLHZpTLNZiDKTZSzMZZT7iA="))
+  };
+  g.drawImage(sunIcon, center.x + 15, center.y - 12);
+  
+  const sunRainIcon = {
+    width : 24, height : 24, bpp : 4,
+    transparent : 0,
+    buffer : require("heatshrink").decompress(atob("AB/wBbEPBAoGEDI/wh4jJBQIMJEgUP///IpAJCBgf/+ALCAQRJFAoIHECgI7FIYwSEHAoGBEQwsEDIJdHCYYLLFwwTEQQwGFQQQACYpYpLf0AAEA"))
+  };
+  g.drawImage(sunRainIcon, center.x - 12, 30);
+  
+  const rainIcon = {
+    width : 24, height : 24, bpp : 4,
+    transparent : 0,
+    buffer : require("heatshrink").decompress(atob("ADnwBRP/AIQAGh4ZKA4YLLh//EwoTFh4GCCIIfGDAQ5DIQ5bIBbQvII4gAGWLwzBOoarLCw4RKLBAAgA"))
+  };
+  g.drawImage(rainIcon, center.x - 44, center.y - 12);
+}
+
+g.setBgColor(0,0,0);
+g.clear();
+
+drawTicks();
+drawScaleLabels();
+drawIcons();
+
+try {
+  Bangle.getPressure().then(data => {
+    drawHand(Math.round(data.pressure));
+  });
+} catch(e) {
+  print(e.message);
+  print("barometer not supporter, show a demo value");
+  drawHand(MIN);
+}

apps/barometer/metadata.json

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+{ "id": "barometer",
+  "name": "Barometer",
+  "shortName":"Barometer",
+  "version":"0.01",
+  "description": "A simple barometer that displays the current air pressure",
+  "icon": "barometer.png",
+  "tags": "tool,outdoors",
+  "allow_emulator":true,
+  "screenshots" : [ { "url": "screenshot.png" } ],
+  "supports" : ["BANGLEJS2"],  
+  "storage": [
+    {"name":"barometer.app.js","url":"app.js"},
+    {"name":"barometer.img","url":"app-icon.js","evaluate":true}
+  ]
+}