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scale.ts
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scale.ts
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import { isNumber } from "@thi.ng/checks/is-number";
import { setC, setC4, setC6 } from "@thi.ng/vectors/setc";
import type { MatOpNV } from "./api";
/**
* Computes 2x2 matrix scale matrix and writes result to `out`. If `s`
* is a number, scaling will be uniform.
*
* @param m -
* @param s -
*/
export const scale22: MatOpNV = (m, s) => (
(s = isNumber(s) ? [s, s] : s), setC4(m || [], s[0], 0, 0, s[1])
);
/**
* Computes 2x3 matrix scale matrix and writes result to `out`. If `s`
* is a number, scaling will be uniform.
*
* @param m -
* @param s -
*/
export const scale23: MatOpNV = (m, s) => (
(s = isNumber(s) ? [s, s] : s), setC6(m || [], s[0], 0, 0, s[1], 0, 0)
);
/**
* Computes 3x3 matrix scale matrix and writes result to `out`. If `s`
* is a number, scaling will be uniform.
*
* @param m -
* @param s -
*/
export const scale33: MatOpNV = (m, s) => (
(s = isNumber(s) ? [s, s, s] : s),
setC(m || [], s[0], 0, 0, 0, s[1], 0, 0, 0, s[2])
);
/**
* Computes 4x4 matrix scale matrix and writes result to `out`. If `s`
* is a number, scaling will be uniform.
*
* @param m -
* @param s -
*/
export const scale44: MatOpNV = (m, s) => (
(s = isNumber(s) ? [s, s, s] : s),
setC(
m || [],
// x
s[0],
0,
0,
0,
// y
0,
s[1],
0,
0,
// z
0,
0,
s[2],
0,
// w
0,
0,
0,
s[3] !== undefined ? s[3] : 1
)
);