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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));
},
};
export const senses = [
frozen, hear,
];
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