BangleApps/apps/andark/app.js

const defaultSettings = {
  loadWidgets    : false,
  textAboveHands : false,
  shortHrHand    : false
};
const settings = Object.assign(defaultSettings, require('Storage').readJSON('andark.json',1)||{});

const c={"x":g.getWidth()/2,"y":g.getHeight()/2};

const zahlpos=(function() {
  let z=[];
  let sk=1;
  for(let i=-10;i<50;i+=5){
     let win=i*2*Math.PI/60;
     let xsk =c.x+2+Math.cos(win)*(c.x-10),
         ysk =c.y+2+Math.sin(win)*(c.x-10);
    if(sk==3){xsk-=10;}
    if(sk==6){ysk-=10;}
    if(sk==9){xsk+=10;}
    if(sk==12){ysk+=10;}
    if(sk==10){xsk+=3;}
    z.push([sk,xsk,ysk]);
    sk+=1;
  }
  return z;
})();

let unlock = false;

function zeiger(len,dia,tim){
  const x=c.x+ Math.cos(tim)*len/2,
        y=c.y + Math.sin(tim)*len/2,
        d={"d":3,"x":dia/2*Math.cos(tim+Math.PI/2),"y":dia/2*Math.sin(tim+Math.PI/2)},
        pol=[c.x-d.x,c.y-d.y,c.x+d.x,c.y+d.y,x+d.x,y+d.y,x-d.x,y-d.y];
  return pol;

}

function drawHands(d) {
  let m=d.getMinutes(), h=d.getHours(), s=d.getSeconds();
  g.setColor(1,1,1);

  if(h>12){
    h=h-12;
  }
  //calculates the position of the minute, second and hour hand
  h=2*Math.PI/12*(h+m/60)-Math.PI/2;
  //more accurate
  //m=2*Math.PI/60*(m+s/60)-Math.PI/2;
  m=2*Math.PI/60*(m)-Math.PI/2;

  s=2*Math.PI/60*s-Math.PI/2;
  //g.setColor(1,0,0);
  const hz = zeiger(settings.shortHrHand?88:100,5,h);
  g.fillPoly(hz,true);
  //g.setColor(1,1,1);
  const minz = zeiger(150,5,m);
  g.fillPoly(minz,true);
  if (unlock){
    const sekz = zeiger(150,2,s);
    g.fillPoly(sekz,true);
  }
  g.fillCircle(c.x,c.y,4);
}

function drawText(d) {
  g.setFont("Vector",10);
  g.setBgColor(0,0,0);
  g.setColor(1,1,1);
  let dateStr = require("locale").date(d);
  g.drawString(dateStr, c.x, c.y+20, true);
  let batStr = Math.round(E.getBattery()/5)*5+"%";
  if (Bangle.isCharging()) {
    g.setBgColor(1,0,0);
  }
  g.drawString(batStr, c.x, c.y+40, true);
}

function drawNumbers() {
  //draws the numbers on the screen
  g.setFont("Vector",20);
  g.setColor(1,1,1);
  g.setBgColor(0,0,0);
  for(let i = 0;i<12;i++){
     g.drawString(zahlpos[i][0],zahlpos[i][1],zahlpos[i][2],true);
  }
}

function draw(){
  // draw black rectangle in the middle to clear screen from scale and hands
  g.setColor(0,0,0);
  g.fillRect(10,10,2*c.x-10,2*c.x-10);
  // prepare for drawing the text
  g.setFontAlign(0,0);
  // do drawing
  drawNumbers();
  const d=new Date();
  if (settings.textAboveHands) {
    drawHands(d); drawText(d);
  } else {
    drawText(d); drawHands(d);
  }
}

//draws the scale once the app is startet
function drawScale(){
  // clear the screen
  g.setBgColor(0,0,0);
  g.clear();
  // draw the ticks of the scale
  for(let i=-14;i<47;i++){
    const win=i*2*Math.PI/60;
    let d=2;
    if(i%5==0){d=5;}
    g.fillPoly(zeiger(300,d,win),true);
    g.setColor(0,0,0);
    g.fillRect(10,10,2*c.x-10,2*c.x-10);
    g.setColor(1,1,1);
  }
}

//// main running sequence ////

// Show launcher when middle button pressed, and widgets that we're clock
Bangle.setUI("clock");
// Load widgets if needed, and make them show swipeable
if (settings.loadWidgets) {
  Bangle.loadWidgets();
  require("widget_utils").swipeOn();
} else if (global.WIDGETS) require("widget_utils").hide();
// Clear the screen once, at startup
drawScale();
draw();

let secondInterval = setInterval(draw, 1000);

// Stop updates when LCD is off, restart when on
Bangle.on('lcdPower',on=>{
  if (secondInterval) clearInterval(secondInterval);
  secondInterval = undefined;
  if (on) {
    secondInterval = setInterval(draw, 1000);
    draw(); // draw immediately
  }
});
Bangle.on('lock',on=>{
  unlock = !on;
  if (secondInterval) clearInterval(secondInterval);
  secondInterval = setInterval(draw, unlock ? 1000 : 60000);
  draw(); // draw immediately
});
Bangle.on('charging',on=>{draw();});