mat4 RenderTile::translateVtxMatrix(const mat4& tileMatrix,
const std::array<float, 2>& translation,
TranslateAnchorType anchor,
const TransformState& state,
const bool inViewportPixelUnits) const {
if (translation[0] == 0 && translation[1] == 0) {
return tileMatrix;
}
mat4 vtxMatrix;
const float angle = inViewportPixelUnits ?
(anchor == TranslateAnchorType::Map ? state.getBearing() : 0) :
(anchor == TranslateAnchorType::Viewport ? -state.getBearing() : 0);
Point<float> translate = util::rotate(Point<float>{ translation[0], translation[1] }, angle);
if (inViewportPixelUnits) {
matrix::translate(vtxMatrix, tileMatrix, translate.x, translate.y, 0);
} else {
matrix::translate(vtxMatrix, tileMatrix,
id.pixelsToTileUnits(translate.x, state.getZoom()),
id.pixelsToTileUnits(translate.y, state.getZoom()),
0);
}
return vtxMatrix;
}
/*
* Returns a matrix for converting from tile units to the correct label coordinate space.
*/
mat4 getLabelPlaneMatrix(const mat4& posMatrix, const bool pitchWithMap, const bool rotateWithMap, const TransformState& state, const float pixelsToTileUnits) {
mat4 m;
matrix::identity(m);
if (pitchWithMap) {
matrix::scale(m, m, 1 / pixelsToTileUnits, 1 / pixelsToTileUnits, 1);
if (!rotateWithMap) {
matrix::rotate_z(m, m, state.getBearing());
}
} else {
matrix::scale(m, m, state.getSize().width / 2.0, -(state.getSize().height / 2.0), 1.0);
matrix::translate(m, m, 1, -1, 0);
matrix::multiply(m, m, posMatrix);
}
return m;
}
