weasley-card.js

class WeasleyClockCard extends HTMLElement {
  set hass(hass) {
    this._hass = hass;
    this.zones = [];
    this.targetstate = [];
    this.exclude = [];
  
    if (this.lastframe && this.lastframe != 0){
      cancelAnimationFrame(this.lastframe);
      this.lastframe = 0;
    }

    var num;
    if (this.config.locations){
      for (num = 0; num < this.config.locations.length; num++){
        if (this.zones.indexOf(this.config.locations[num]) == -1){
          this.zones.push(this.config.locations[num]);
        }
      }
    }
    if (this.config.exclude){
      for (num = 0; num < this.config.exclude.length; num++){
        if (this.exclude.indexOf(this.config.exclude[num]) == -1){
          this.exclude.push(this.config.exclude[num]);
        }
      }
    }
    if (this.config.lost){
      this.zones.push(this.config.lost);
    }
    if (this.config.travelling){
      this.zones.push(this.config.travelling);
    }

    if (this.config.shaft_colour){
      this.shaft_colour = this.config.shaft_colour;
    }
    else {
      this.shaft_colour = getComputedStyle(document.documentElement).getPropertyValue('--primary-color');
    }
    
    for (num = 0; num < this.config.wizards.length; num++){
      if (!this._hass.states[this.config.wizards[num].entity])
        throw new Error("Unable to find state for entity " + this.config.wizards[num].entity);
      const state = this._hass.states[this.config.wizards[num].entity];
      var stateStr = state && state.state && state.state != "off" && state.state != "unknown" ? 
        (state.attributes ? 
          (state.attributes.message ? state.attributes.message : state.state) 
          : state.state
        )
        :  "not_home";
      if (this._hass.states["zone." + stateStr] && this._hass.states["zone." + stateStr].attributes && this._hass.states["zone." + stateStr].attributes.friendly_name)
      {
        stateStr = this._hass.states["zone." + stateStr].attributes.friendly_name;
      }    
      if (this.zones.indexOf(stateStr) == -1 && stateStr != "not_home" && stateStr != this.travellingState && !this.exclude.includes(stateStr))  {
        if (typeof(stateStr)!=="string")
          throw new Error("Unable to add state for entity " + this.config.wizards[num].entity + " of type " + typeof(stateStr) + ".");
        this.zones.push(stateStr);
      }
    }
//    this.zones.push(this.travellingState);
//    this.zones.push(this.lostState);
    if (!this.canvas) {
      const card = document.createElement('ha-card');
      //card.header = 'Wizard Clock';
      var fontstyle = document.createElement('style');
      if (this.config.fontface){
        fontstyle.innerText = "@font-face { " + this.config.fontface + " }  ";
      } else {
        // my default
        fontstyle.innerText = "@font-face {    font-family: itcblkad_font;    src: local(itcblkad_font), url('/local/ITCBLKAD.TTF') format('opentype');}  ";
      }
      document.body.appendChild(fontstyle);

      this.canvas = document.createElement('canvas');
      card.appendChild(this.canvas);
      this.appendChild(card);
      this.ctx = this.canvas.getContext("2d");
    }

    this.canvas.style.maxWidth = "-webkit-fill-available";
    this.canvas.width="500";
    this.canvas.height="500";

    this.radius = this.canvas.height / 2;
    this.ctx.translate(this.radius, this.radius);
    this.radius = this.radius * 0.90

    if (this.config.fontName) {
      this.selectedFont = this.config.fontName;
    } else { 
      this.selectedFont = "itcblkad_font";
    }
    this.fontScale = 1.1;

    var obj = this;
    this.lastframe = requestAnimationFrame(function(){ 
      obj.drawClock(); 
    });
  }

  setConfig(config) {
    if (!config.wizards) {
      throw new Error('You need to define some wizards');
    }
    // if (!config.locations) {
    //   throw new Error('You need to define some locations');
    // }
    this.config = config;
    this.currentstate = [];
    this.lostState = config.lost ? config.lost : "Lost";
    this.travellingState = config.travelling ? config.travelling : "Travelling";
  }

  // The height of your card. Home Assistant uses this to automatically
  // distribute all cards over the available columns.
  getCardSize() {
    return 6;
  }

  drawClock() {
      this.lastframe = 0;
      this.ctx.clearRect(-this.canvas.width/2, -this.canvas.height/2, this.canvas.width/2, this.canvas.height/2)
      this.drawFace(this.ctx, this.radius);
      this.drawNumbers(this.ctx, this.radius, this.zones);
      this.drawTime(this.ctx, this.radius, this.zones, this.config.wizards);
      this.drawHinge(this.ctx, this.radius, this.shaft_colour);
      // request next frame if required
      var redraw = false;
      var num;
      for (num = 0; num < this.currentstate.length; num++){
        if (Math.round(this.currentstate[num].pos*100) != Math.round(this.targetstate[num].pos*100))
        {
          redraw = true;
        }
      }

      if (redraw){
        var obj = this;
        this.lastframe = requestAnimationFrame(function(){ 
          obj.drawClock(); 
        });
      }
  }

  drawFace(ctx, radius) {
    ctx.shadowColor = null;
    ctx.shadowBlur = 0;
    ctx.shadowOffsetX = 0;
    ctx.shadowOffsetY = 0;

    ctx.beginPath();
    ctx.arc(0, 0, radius, 0, 2*Math.PI);
    ctx.fillStyle = getComputedStyle(document.documentElement).getPropertyValue('--secondary-background-color');
    ctx.fill();

    ctx.strokeStyle = getComputedStyle(document.documentElement).getPropertyValue('--primary-background-color:');
    ctx.lineWidth = radius*0.02;
    ctx.stroke();
  }

  drawHinge(ctx, radius, colour) {
    ctx.beginPath();
    ctx.arc(0, 0, radius*0.05, 0, 2*Math.PI);
    ctx.fillStyle = colour;
    ctx.shadowColor = "#0008";
    ctx.shadowBlur = 10;
    ctx.shadowOffsetX = 5;
    ctx.shadowOffsetY = 5;
    ctx.fill();
  }

  drawNumbers(ctx, radius, locations) {
      /* 
        Text on a curve code modified from function written by James Alford here: http://blog.graphicsgen.com/2015/03/html5-canvas-rounded-text.html
      */
      var ang;
      var num;
      ctx.font = radius*0.15*this.fontScale + "px " + this.selectedFont;
      ctx.textBaseline="middle";
      ctx.textAlign="center";
      ctx.fillStyle = getComputedStyle(document.documentElement).getPropertyValue('--primary-text-color');
      for(num= 0; num < locations.length; num++){
          ang = num * Math.PI / locations.length * 2;
          // rotate to center of drawing position
          ctx.rotate(ang);
 
          var startAngle = 0; 
          var inwardFacing = true;
          var kerning = 0; // can adjust kerning using this - maybe automatically adjust it based on text length? 
          var text = locations[num].split("").reverse().join("");
          // if we're in the bottom half of the clock then reverse the facing of the text so that it's not upside down
          if (ang > Math.PI / 2 && ang < ((Math.PI * 2) - (Math.PI / 2))) 
          {
            startAngle = Math.PI;
            inwardFacing = false;
            text = locations[num];
          }

          // calculate height of the font. Many ways to do this - you can replace with your own!
          var div = document.createElement("div");
          div.innerHTML = text;
          div.style.position = 'absolute';
          div.style.top = '-10000px';
          div.style.left = '-10000px';
          div.style.fontFamily = this.selectedFont;
          div.style.fontSize = radius*0.15*this.fontScale + "px";
          document.body.appendChild(div);
          var textHeight = div.offsetHeight;
          document.body.removeChild(div);

          // rotate 50% of total angle for center alignment
          for (var j = 0; j < text.length; j++) {
              var charWid = ctx.measureText(text[j]).width;
              startAngle += ((charWid + (j == text.length-1 ? 0 : kerning)) / (radius - textHeight)) / 2 ;
          }

          // Phew... now rotate into final start position
          ctx.rotate(startAngle);

          // Now for the fun bit: draw, rotate, and repeat
          for (var j = 0; j < text.length; j++) {
              var charWid = ctx.measureText(text[j]).width; // half letter
              // rotate half letter
              ctx.rotate((charWid/2) / (radius - textHeight) * -1); 
              // draw the character at "top" or "bottom" 
              // depending on inward or outward facing
              ctx.fillText(text[j], 0, (inwardFacing ? 1 : -1) * (0 - radius + textHeight ));

              ctx.rotate((charWid/2 + kerning) / (radius - textHeight) * -1); // rotate half letter
          }
          // rotate back round from the end position to the central position of the text
          ctx.rotate(startAngle);

          // rotate to the next location
          ctx.rotate(-ang);
      }
  }



  drawTime(ctx, radius, locations, wizards){
      this.targetstate = [];
      var num;
      for (num = 0; num < wizards.length; num++){
        const state = this._hass.states[wizards[num].entity];
        var stateStr = state && state.state != "off" && state.state != "unknown" ? 
          (state.attributes ? 
            (state.attributes.message ? state.attributes.message : state.state) 
            : state.state
          )
          :  this.lostState;
	
        if (this.exclude.includes(stateStr) ||
	  (this._hass.states["zone." + stateStr] && this._hass.states["zone." + stateStr].attributes && this._hass.states["zone." + stateStr].attributes.friendly_name &&
          this.exclude.includes(this._hass.states["zone." + stateStr].attributes.friendly_name))) {

          stateStr = this.lostState;
	}
        const stateVelo = state && state.attributes ? (
          state.attributes.velocity ? state.attributes.velocity : (
            state.attributes.moving ? 16 : 0
          )) : 0; 
        var locnum;
        var wizardOffset = ((num-((wizards.length-1)/2)) / wizards.length * 0.6);
        var location = wizardOffset; // default
        for (locnum = 0; locnum < locations.length; locnum++){
          if ((locations[locnum].toLowerCase() == stateStr.toLowerCase()) 
              || (locations[locnum] == this.travellingState && stateVelo > 15)
              || (locations[locnum] == this.lostState && stateStr == "not_home" && stateVelo <= 15))
          {
            location = locnum + wizardOffset;
            break;
          }
        }
        //var location = locations.indexOf(wizards[num].location) + ((num-((wizards.length-1)/2)) / wizards.length * 0.75);
        location = location * Math.PI / locations.length * 2;
        // set targetstate
        this.targetstate.push({pos: location, length: radius*0.7, width: radius*0.1, wizard: wizards[num].name, colour: wizards[num].colour, textcolour: wizards[num].textcolour});
      }
      // update currentstate from targetstate
      if (!this.currentstate)
      {
        this.currentstate = [];
      }
      for (num = 0; num < wizards.length; num++){
        if (this.currentstate[num]){
          this.currentstate[num].pos = this.currentstate[num].pos + ((this.targetstate[num].pos - this.currentstate[num].pos) / 60); 
        } else {
          // default to 12 o'clock to start
          this.currentstate.push({pos: 0, length: this.targetstate[num].length, width: this.targetstate[num].width, wizard: this.targetstate[num].wizard, colour: this.targetstate[num].colour, textcolour: this.targetstate[num].textcolour});
        }
      }
      // draw currentstate
      for (num = 0; num < wizards.length; num++){
        this.drawHand(ctx, this.currentstate[num].pos, this.currentstate[num].length, this.currentstate[num].width, this.currentstate[num].wizard, this.currentstate[num].colour, this.currentstate[num].textcolour);
      }
  }

  drawHand(ctx, pos, length, width, wizard, colour, textcolour) {
    ctx.beginPath();
    ctx.lineWidth = width;
    if (colour) {
      ctx.fillStyle = colour;
    } else {
      ctx.fillStyle = getComputedStyle(document.documentElement).getPropertyValue('--primary-color');
    }
    ctx.shadowColor = "#0008";
    ctx.shadowBlur = 10;
    ctx.shadowOffsetX = 5;
    ctx.shadowOffsetY = 5;
    ctx.moveTo(0,0);
    ctx.rotate(pos);
    ctx.quadraticCurveTo(width, -length*0.5, width, -length*0.75);
    ctx.quadraticCurveTo(width*0.2, -length*0.8, 0, -length);
    ctx.quadraticCurveTo(-width*0.2, -length*0.8, -width, -length*0.75);
    ctx.quadraticCurveTo(-width, -length*0.5, 0, 0);

    ctx.fill();

    ctx.font = width*this.fontScale + "px " + this.selectedFont;
    if (textcolour) {
      ctx.fillStyle = textcolour;
    } else {
      ctx.fillStyle = getComputedStyle(document.documentElement).getPropertyValue('--primary-text-color');
    }
    ctx.translate(0, -length/2);
    ctx.rotate(Math.PI/2)
    if (pos < Math.PI && pos >= 0) 
        ctx.rotate(Math.PI);
    ctx.fillText(wizard, 0, 0);
    if (pos < Math.PI && pos >= 0) 
        ctx.rotate(-Math.PI);
    ctx.rotate(-Math.PI/2);
    ctx.translate(0, length/2);
    
    ctx.rotate(-pos);
  }
    
}

customElements.define('weasley-card', WeasleyClockCard);