JS1k: The JavaScript code golfing competition

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// Spawn - (c) Arcade Badgers 2019
// Written by Steven Campbell
// @ArcadeBadgers @stuckieGAMEZ

// Well, it was meant to be a strategy game with totem placement generating power to build more and take over the land
// Ended up turning into an arcade-style thing in the end to get it under the 1k.. and relatively amusing

players = [];
for (var i = 0; i < 32; ++i) {
    players.push({c: "hsl(" + (10 * i) + ",99%,50%)"    // colour
                , t: [] });         // totems)
    players[i].t.push({ x: i * a.width / 32, y: Math.random() * a.height, r: 8, t: 30});
}
I = players[0];

dwn = false;
mX = 0;
mY = 0;
onmousedown=e=>{
    dwn = true;
    mX = e.clientX;
    mY = e.clientY;
};

onmousemove=e=>{
    mX = e.clientX;
    mY = e.clientY;
};

onmouseup=e=>{
    dwn = false;
    mX = e.clientX;
    mY = e.clientY;
};

/*
ontouchdown=e=>{
    var t = e.touches[0];
    dwn = true;
    mX = t.clientX;
    mY = t.clientY;
};
ontouchmove=e=>{
    var t = e.touches[0];
    mX = t.clientX;
    mY = t.clientY;
};
ontouchup=e=>{
    var t = e.touches[0];
    dwn = false;
    mX = t.clientX;
    mY = t.clientY;
};
*/

var inputdown = function() {
    if (false == dwn) return;
    var newTotem = false;
    var p = players[0];
    for (var j = 0; j < p.t.length; ++j) {
        var t = p.t[j];
        var u = { x: mX, y: mY, r: -t.r+8 }
        if (true == areaInArea(t, u)) {
            if (t.r < 99) { t.r+=9; return; }
        } else {
            u.r=0;
            newTotem |= areaInArea(t, u);
        }
    }
    if (true == newTotem) p.t.push({ x: mX, y: mY, r: 8, t: 30});
};

var areaInArea = function(t, u) {
    var dx = Math.abs( t.x - u.x );
    var dy = Math.abs( t.y - u.y );
    var dr = Math.abs( t.r + u.r );

    return ((dx*dx + dy*dy) <= dr*dr);
}

var process = function(p) {
	for (var i = 0; i < p.t.length; ++i) {
		var t = p.t[i];
		c.beginPath();
        c.arc(t.x, t.y, t.r, 0, 2*3.14);
        c.fill();
    }
    
    for (var i = 0; i < p.t.length; ++i) {
        var t = p.t[i];

        var isSafe = false;
        for (var j = 0; j < p.t.length; ++j) {
            var u = p.t[j];
            if (0 == i) { isSafe = true; break; }
            if (t == u) continue;
            if (true == areaInArea(t, u)) { isSafe = true; break; }
        }
        if (false == isSafe) {
          p.t.splice(i, 1);
          continue;
        }

        for (var j = 0; j < players.length; ++j) {
            var e = players[j];
            if (e == p) continue;
            for (var k = 0; k < e.t.length; ++k) {
                var u = e.t[k];
                if (true == areaInArea(t, u)) {
                    if (t.r > u.r) { u.r -= 2; t.r--; }
                    else continue;
                    if (u.r < 8) {
                        e.t.splice(k, 1);
                        break;
                    }
                }
            }
        }

        if (--t.t < 0) t.t = 30;

        c.strokeRect(t.x-8, t.y-8, 16, 16);
        c.fillRect(t.x-8, t.y-8, 16, 16);
    }

    if ((I != p)
    && (0 < p.t.length)) {
        var t = p.t[p.t.length - 1];
        if (t.r < 99) t.r += 4;
        else {
            var e = p;
            while (e == p) e = players[Math.floor(Math.random() * players.length)];
            if (0 < e.t.length) {
              var u = e.t[Math.floor(Math.random() * e.t.length)];
              var dx = (u.x - t.x);
              var dy = (u.y - t.y);
              var a = Math.atan2(dy, dx);
              var px = t.x + Math.cos(a) * t.r;
              var py = t.y + Math.sin(a) * t.r;
              p.t.push({ x: px, y: py, r: 8, t: 30});
            }
        }
    }
}

setInterval(function() {
    c.clearRect(0, 0, a.width, a.height);

    for (var i = 0; i < players.length; ++i) {
        var p = players[i];
        c.fillStyle = p.c;
        process(p);
    }

    inputdown();
    
}, 30);