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'use strict';
const frozen = {
size: 1,
read: (world, agent) => {
if (agent.flags.frozen === true) {
return [ 1 ];
} else {
return [ 0 ];
}
},
};
// add two arrays together element-wise with a scaling factor
function array_scalesum(a, s, b) {
return a.map((x, i) => x + (s*b[i]));
}
// determine the square of the distance between two cells
function lattice_dist2(x0, y0, x1, y1) {
if (x0 === x1 && y0 === y1) { return 1; } // not proper distance but avoids divide-by-zero errors c:
return ((x0-x1)**2) + ((y0-y1)**2);
}
const hear = {
size: 8,
read: (world, agent) => {
const {x, y} = agent;
const lattice_sounds = world.lattice
.map((row, cy) => row.map((cell, cx) => [ 1/lattice_dist2(x, y, cx, cy), cell ]))
.flat()
.filter(([scale, cell]) => cell.flags.emit !== undefined)
.reduce(
(acc, [scale, cell]) => array_scalesum(acc, scale, cell.flags.emit),
[0, 0, 0, 0, 0, 0, 0, 0]
);
const agent_sounds = world.agents
.filter(a => a.flags.emit !== undefined)
.reduce(
(acc, a) => array_scalesum(acc, 1/lattice_dist2(x, y, a.x, a.y), a.flags.emit),
[0, 0, 0, 0, 0, 0, 0, 0]
);
return array_scalesum(lattice_sounds, 1, agent_sounds).map(ch => Math.tanh(ch));
},
};
const [VIS_WIDTH, VIS_HEIGHT] = [31, 31];
const [VIS_HWIDTH, VIS_HHEIGHT] = [Math.floor(VIS_WIDTH/2), Math.floor(VIS_HEIGHT/2)];
function identity_mod(n, p) {
const mod = (n % (2*p)) - p + 1;
return mod/p;
}
function world_pos_to_vision_pos(world, agent, x, y) {
const dx = x - agent.x;
const dy = y - agent.y;
const orientation = agent.flags.orientation || 'n';
switch (orientation) {
case 'n':
return [VIS_HWIDTH+dx, VIS_HEIGHT+dy-1];
case 's':
return [VIS_HWIDTH-dx, VIS_HEIGHT-dy-1];
case 'e':
return [VIS_HWIDTH+dy, VIS_HEIGHT-dx-1];
case 'w':
return [VIS_HWIDTH-dy, VIS_HEIGHT+dx-1];
}
}
function vision_pos_to_world_pos(world, agent, x, y) {
const dx = x-VIS_HWIDTH;
const dy = y-VIS_HEIGHT+1;
const orientation = agent.flags.orientation || 'n';
switch (orientation) {
case 'n':
return [agent.x + dx, agent.y + dy];
case 's':
return [agent.x - dx, agent.y - dy];
case 'e':
return [agent.x - dy, agent.y - dx];
case 'w':
return [agent.x + dy, agent.y + dx];
}
}
function world_pos_to_vision_idx(world, agent, x, y) {
const [vx, vy] = world_pos_to_vision_pos(world, agent, x, y);
return (VIS_WIDTH * vy) + vx;
}
function vision_idx_to_world_pos(world, agent, idx) {
const vx = idx % VIS_WIDTH;
const vy = Math.floor(idx / VIS_WIDTH);
const result = vision_pos_to_world_pos(world, agent, vx, vy);
return result;
}
function see_cell(world, x, y) {
const team = 0;
const orientation = 0;
if (!world.lattice[y] || !world.lattice[y][x]) {
// beyond the map edge
return [ 0, 0, 0 ];
}
const type = {
active: -0.8,
mutable: -0.4,
empty: 0.0,
immutable: 0.4,
flag: 0.8,
}[world.lattice[y][x].type];
return [team, orientation, type];
}
function relative_orientation(viewer, agent) {
switch(viewer.flags.orientation) {
case 'n': return { n: -0.8, e: -0.4, s: 0.4, w: 0.8 }[agent.flags.orientation];
case 'e': return { e: -0.8, s: -0.4, w: 0.4, n: 0.8 }[agent.flags.orientation];
case 's': return { s: -0.8, w: -0.4, n: 0.4, e: 0.8 }[agent.flags.orientation];
case 'w': return { w: -0.8, n: -0.4, e: 0.4, s: 0.8 }[agent.flags.orientation];
}
}
function see_agent(viewer, agent) {
const team = {
0: -0.8,
1: -0.4,
2: 0.4,
3: 0.8,
}[agent.flags.team] + (identity_mod(agent.id, 11)/16);
const orientation = relative_orientation(viewer, agent) + (identity_mod(agent.id, 37)/16);
const frozen = agent.flags.frozen || agent.flags.pretend_frozen;
const type = (() => {
if (frozen && agent.flags.flag) {
return -0.4;
} else if (frozen) {
return -0.8;
} else if (agent.flags.flag) {
return 0.8;
} else {
return 0.0;
}
})() + (identity_mod(agent.id, 499)/16);
return [team, orientation, type];
}
const see = {
size: VIS_WIDTH * VIS_HEIGHT,
read: (world, agent) => {
const vision = [...Array(VIS_WIDTH*VIS_HEIGHT).keys()]
.map(idx => {
const [x, y] = vision_idx_to_world_pos(world, agent, idx);
return see_cell(world, x, y);
});
const result = world.agents.reduce(
(acc, a) => {
const idx = world_pos_to_vision_idx(world, agent, a.x, a.y);
if (idx < 0 || idx > VIS_WIDTH*VIS_HEIGHT) {
return acc;
} else {
acc.splice(idx, 1, see_agent(agent, a));
return acc;
}
},
vision
);
return result;
},
};
export const senses = [
frozen, hear, see,
];
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