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move the point origin back to bottom-left

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This commit is contained in:
Ansis Brammanis
2015-08-25 11:59:02 -04:00
parent 10f0d8d23a
commit 36d71c95dc
2 changed files with 13 additions and 3 deletions
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8
src/mbgl/map/transform_state.cpp
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@@ -217,7 +217,7 @@ vec2<double> TransformState::coordinateToPoint(const TileCoordinate& coord) cons
matrix::vec4 p;
matrix::vec4 c = {{ coord.column, coord.row, 0, 1 }};
matrix::transformMat4(p, c, mat);
return { p[0] / p[3], p[1] / p[3] };
return { p[0] / p[3], height - p[1] / p[3] };
}
TileCoordinate TransformState::pointToCoordinate(const vec2<double> point) const {
@@ -232,14 +232,16 @@ TileCoordinate TransformState::pointToCoordinate(const vec2<double> point) const
if (err) throw std::runtime_error("failed to invert coordinatePointMatrix");
double flippedY = height - point.y;
// since we don't know the correct projected z value for the point,
// unproject two points to get a line and then find the point on that
// line with z=0
matrix::vec4 coord0;
matrix::vec4 coord1;
matrix::vec4 point0 = {{ point.x, point.y, 0, 1 }};
matrix::vec4 point1 = {{ point.x, point.y, 1, 1 }};
matrix::vec4 point0 = {{ point.x, flippedY, 0, 1 }};
matrix::vec4 point1 = {{ point.x, flippedY, 1, 1 }};
matrix::transformMat4(coord0, point0, inverted);
matrix::transformMat4(coord1, point1, inverted);