diff options
author | Matthew Kosarek <mattkae@protonmail.com> | 2021-02-06 18:39:48 -0500 |
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committer | Matthew Kosarek <mattkae@protonmail.com> | 2021-02-06 18:39:48 -0500 |
commit | 376e1a7f9207fffb1ec3027ac1e7f32db5de4922 (patch) | |
tree | 8bc6c381a10d8b62ff33cdcff6daa1d17cee0f9a /frontend/_rigidbody/vec2.js |
Initial commit
Diffstat (limited to 'frontend/_rigidbody/vec2.js')
-rw-r--r-- | frontend/_rigidbody/vec2.js | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/frontend/_rigidbody/vec2.js b/frontend/_rigidbody/vec2.js new file mode 100644 index 0000000..3b24371 --- /dev/null +++ b/frontend/_rigidbody/vec2.js @@ -0,0 +1,41 @@ +function vec2(x = 0, y = 0) { + return { x: x, y: y}; +} + +function addVec2(v1, v2) { + return { + x: v1.x + v2.x, + y: v1.y + v2.y + }; +} + +function subVec2(v1, v2) { + return { + x: v1.x - v2.x, + y: v1.y - v2.y + }; +} + +function scaleVec2(v, s) { + return { + x: v.x * s, + y: v.y * s + }; +} + +function dot2(v1, v2) { + return v1.x * v2.x + v1.y * v2.y; +} + +function length2(v) { + return Math.sqrt(v.x * v.x + v.y * v.y); +} + +function normalize2(v) { + const lLength = 1.0 / length2(v); + return { x: v.x * lLength, y: v.y * lLength }; +} + +function vec2str(v) { + return `(${v.x.toFixed(2)}, ${v.y.toFixed(2)})`; +}
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