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author | John Firebaugh <john.firebaugh@gmail.com> | 2014-08-26 15:24:16 -0700 |
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committer | John Firebaugh <john.firebaugh@gmail.com> | 2014-10-17 10:44:38 -0700 |
commit | 4603ca037cab2d0f732285ce9e006744ad3118d6 (patch) | |
tree | 0c14ef89bfc59a4501f63fb34e89bfc8ce6ccb01 /src/util | |
parent | 48a310406621957db4154e844d28e98f460a0226 (diff) | |
download | qtlocation-mapboxgl-4603ca037cab2d0f732285ce9e006744ad3118d6.tar.gz |
background-image support
Diffstat (limited to 'src/util')
-rw-r--r-- | src/util/mat3.cpp | 46 |
1 files changed, 45 insertions, 1 deletions
diff --git a/src/util/mat3.cpp b/src/util/mat3.cpp index 38858d2385..263768ee41 100644 --- a/src/util/mat3.cpp +++ b/src/util/mat3.cpp @@ -38,7 +38,51 @@ void matrix::identity(mat3& out) { out[8] = 1.0f; } -void matrix::scale(mat3& out, const mat3& a, const float x, const float y) { +void matrix::translate(mat3& out, const mat3& a, float x, float y) { + float a00 = a[0], a01 = a[1], a02 = a[2], + a10 = a[3], a11 = a[4], a12 = a[5], + a20 = a[6], a21 = a[7], a22 = a[8]; + + out[0] = a00; + out[1] = a01; + out[2] = a02; + + out[3] = a10; + out[4] = a11; + out[5] = a12; + + out[6] = x * a00 + y * a10 + a20; + out[7] = x * a01 + y * a11 + a21; + out[8] = x * a02 + y * a12 + a22; +} + +void matrix::rotate(mat3& out, const mat3& a, float rad) { + float s = std::sin(rad), + c = std::cos(rad), + a00 = a[0], + a01 = a[1], + a02 = a[2], + a10 = a[3], + a11 = a[4], + a12 = a[5], + a20 = a[6], + a21 = a[7], + a22 = a[8]; + + out[0] = c * a00 + s * a10; + out[1] = c * a01 + s * a11; + out[2] = c * a02 + s * a12; + + out[3] = c * a10 - s * a00; + out[4] = c * a11 - s * a01; + out[5] = c * a12 - s * a02; + + out[6] = a20; + out[7] = a21; + out[8] = a22; +}; + +void matrix::scale(mat3& out, const mat3& a, float x, float y) { out[0] = x * a[0]; out[1] = x * a[1]; out[2] = x * a[2]; |