comparison: src/ui/canvas.cpp
src/ui/canvas.cpp
- changeset 66
- 77c819262b7a
- parent 65
- 87c906545fc3
- child 67
- 612213a168da
equal
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replaced
| 65:87c906545fc3 | 66:77c819262b7a |
|---|---|
| 43 this->worldPosition = glm::round(*this->worldPosition); | 43 this->worldPosition = glm::round(*this->worldPosition); |
| 44 // And finally transform it back to grid coordinates by transforming it with the | 44 // And finally transform it back to grid coordinates by transforming it with the |
| 45 // grid matrix. | 45 // grid matrix. |
| 46 this->worldPosition = this->gridMatrix * glm::vec4{*this->worldPosition, 1}; | 46 this->worldPosition = this->gridMatrix * glm::vec4{*this->worldPosition, 1}; |
| 47 } | 47 } |
| 48 /* | |
| 48 if (this->worldPosition.has_value()) | 49 if (this->worldPosition.has_value()) |
| 49 { | 50 { |
| 50 this->newStatusText("Position: (%1, %2, %3)"_q | 51 this->newStatusText("Position: (%1, %2, %3)"_q |
| 51 .arg(toDouble(this->worldPosition->x)) | 52 .arg(toDouble(this->worldPosition->x)) |
| 52 .arg(toDouble(this->worldPosition->y)) | 53 .arg(toDouble(this->worldPosition->y)) |
| 54 } | 55 } |
| 55 else | 56 else |
| 56 { | 57 { |
| 57 this->newStatusText("Position: <none>"_q); | 58 this->newStatusText("Position: <none>"_q); |
| 58 } | 59 } |
| 60 */ | |
| 61 // use a relatively high threshold so that we know when the grid is somewhat perpendicular so we can | |
| 62 // automatically change it properly | |
| 63 this->newStatusText("Change: %1"_q.arg(isGridPerpendicularToScreen(0.03f) ? "yes" : "no")); | |
| 59 PartRenderer::mouseMoveEvent(event); | 64 PartRenderer::mouseMoveEvent(event); |
| 60 } | 65 } |
| 61 | 66 |
| 62 void Canvas::mousePressEvent(QMouseEvent* event) | 67 void Canvas::mousePressEvent(QMouseEvent* event) |
| 63 { | 68 { |
| 165 this->gridMatrix * glm::vec4{0, 1, 0, 1}, | 170 this->gridMatrix * glm::vec4{0, 1, 0, 1}, |
| 166 }; | 171 }; |
| 167 this->gridPlane = geom::planeFromTriangle(triangle); | 172 this->gridPlane = geom::planeFromTriangle(triangle); |
| 168 this->gridProgram->setGridMatrix(this->gridMatrix); | 173 this->gridProgram->setGridMatrix(this->gridMatrix); |
| 169 } | 174 } |
| 175 | |
| 176 /** | |
| 177 * @brief Calculates if the screen is perpendicular to the current grid | |
| 178 * @return yes no | |
| 179 */ | |
| 180 bool Canvas::isGridPerpendicularToScreen(float threshold) const | |
| 181 { | |
| 182 // Find out where the grid is projected on the screen | |
| 183 const QPoint gridOrigin2d = pointFToPoint(this->modelToScreenCoordinates(this->gridPlane.anchor)); | |
| 184 // Find out which direction the camera is looking at the grid origin in 3d | |
| 185 const glm::vec3 cameraDirection = glm::normalize(this->cameraLine(gridOrigin2d).direction); | |
| 186 // Compute the dot product. The parameters given are: | |
| 187 // - the normal of the grid plane, which is the vector from the grid origin perpendicular to the grid | |
| 188 // - the direction of the camera looking at the grid, which is the inverse of the vector from the grid | |
| 189 // origin towards the camera | |
| 190 // If the dot product between these two vectors is 0, the grid normal is perpendicular to the camera vector | |
| 191 // and the grid is perpendicular to the screen. | |
| 192 const float dot = glm::dot(glm::normalize(this->gridPlane.normal), glm::normalize(cameraDirection)); | |
| 193 return std::abs(dot) < threshold; | |
| 194 } |
