axial_round = (x, y) => {
const xgrid = Math.round(x), ygrid = Math.round(y);
x -= xgrid, y -= ygrid; // remainder
const dx = Math.round(x + 0.5*y) * (x*x >= y*y);
const dy = Math.round(y + 0.5*x) * (x*x < y*y);
return [xgrid + dx, ygrid + dy];
}
square_float_to_axial_hex_grid = {
const SQRT3 = Math.sqrt(3),
ratio = [Math.sqrt(4/3), Math.sqrt(Math.sqrt(4/3)), 1][hexsize];
if (pointy_top) return (x, y) => {
x = ratio * 0.5 * (SQRT3*x - y), y *= ratio; // pointy top hexagons
return axial_round(x, y);
}
else return (x, y) => {
y = ratio * 0.5 * (SQRT3*y - x), x *= ratio; // flat top hexagons
return axial_round(x, y);
}
}
square_round = (x, y) => {
const xgrid = Math.round(x), ygrid = Math.round(y);
return [xgrid, ygrid];
}
top_plot_round = squares ? square_round : axial_round;
cursor_to_xy = ([px, py]) => {
const
[width, height] = size,
oy = -zoom * (2/width * py - 0.7),
ox = zoom * (2/width * px - 0.5);
return [ox, oy];
}
imageData1 = {
let [width, height] = size;
width *= 2; height *= 2;
for (let py = 0; py < height; py++) {
const oy = -zoom * (2/width * py - 0.7);
for (let px = 0; px < width; px++) {
const ox = zoom * (2/width * px - 0.5);
const index = 4 * (py*width + px);
data1.set(colorxy(top_plot_round(ox, oy)), index);
}
}
return new ImageData(data1, width, height);
}
imageData2 = {
let [width, height] = size;
width *= 2; height *= 2;
for (let py = 0; py < height; py++) {
const oy = -zoom * (2/width * py - 0.7);
for (let px = 0; px < width; px++) {
const ox = zoom * (2/width * px - 0.5);
const index = 4 * (py*width + px);
data2.set(colorxy(square_float_to_axial_hex_grid(ox, oy)), index);
}
}
return new ImageData(data2, width, height);
}
data1 = new Uint8ClampedArray(2*size[0] * 2*size[1] * 4);
data2 = new Uint8ClampedArray(2*size[0] * 2*size[1] * 4);
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