37 lines
940 B
TypeScript
37 lines
940 B
TypeScript
export type Color = number;
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export type Grid = {
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width: number;
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height: number;
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data: (Color | null)[];
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};
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export const getIndex = (grid: Grid, x: number, y: number) =>
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x * grid.height + y;
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export const isInside = (grid: Grid, x: number, y: number) =>
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x >= 0 && y >= 0 && x < grid.width && y < grid.height;
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export const isInsideLarge = (grid: Grid, m: number, x: number, y: number) =>
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x >= -m && y >= -m && x < grid.width + m && y < grid.height + m;
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export const getColor = (grid: Grid, x: number, y: number) =>
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grid.data[getIndex(grid, x, y)];
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export const copyGrid = (grid: Grid) => ({ ...grid, data: grid.data.slice() });
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export const setColor = (
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grid: Grid,
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x: number,
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y: number,
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color: Color | null
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) => {
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grid.data[getIndex(grid, x, y)] = color;
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};
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export const createEmptyGrid = (width: number, height: number) => ({
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width,
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height,
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data: Array.from({ length: width * height }, () => null),
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});
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