comparison: src/canvas.cpp
src/canvas.cpp
- changeset 1181
- ca6d0ef9aadb
- parent 1178
- 3a88e7a60b63
- child 1182
- 813d020f92d4
equal
deleted
inserted
replaced
| 1180:2005e4147ad6 | 1181:ca6d0ef9aadb |
|---|---|
| 93 /* | 93 /* |
| 94 * Assuming we're currently viewing from a fixed camera, draw a backdrop into it. Currently this means drawing the grid. | 94 * Assuming we're currently viewing from a fixed camera, draw a backdrop into it. Currently this means drawing the grid. |
| 95 */ | 95 */ |
| 96 void Canvas::drawFixedCameraBackdrop() | 96 void Canvas::drawFixedCameraBackdrop() |
| 97 { | 97 { |
| 98 static const enum { Cartesian, Polar } gridType = Cartesian; | |
| 99 | |
| 98 // Find the top left corner of the grid | 100 // Find the top left corner of the grid |
| 99 Vertex topLeft = currentCamera().idealize(currentCamera().convert2dTo3d({0, 0})); | 101 Vertex topLeft = currentCamera().idealize(currentCamera().convert2dTo3d({0, 0})); |
| 100 Vertex bottomRight = currentCamera().idealize(currentCamera().convert2dTo3d({width(), height()})); | 102 Vertex bottomRight = currentCamera().idealize(currentCamera().convert2dTo3d({width(), height()})); |
| 101 qreal gridSize = grid()->coordinateSnap(); | 103 qreal gridSize = grid()->coordinateSnap(); |
| 102 qreal x0 = sign(topLeft.x()) * (fabs(topLeft.x()) - fmod(fabs(topLeft.x()), gridSize)); | |
| 103 qreal y0 = sign(topLeft.y()) * (fabs(topLeft.y()) - fmod(fabs(topLeft.y()), gridSize)); | |
| 104 glEnable(GL_LINE_STIPPLE); | 104 glEnable(GL_LINE_STIPPLE); |
| 105 glBegin(GL_LINES); | 105 glBegin(GL_LINES); |
| 106 | 106 |
| 107 static const auto prepareGridLine = [](qreal value) -> bool | 107 if (gridType == Cartesian) |
| 108 { | 108 { |
| 109 if (not isZero(value)) | 109 qreal x0 = sign(topLeft.x()) * (fabs(topLeft.x()) - fmod(fabs(topLeft.x()), gridSize)); |
| 110 { | 110 qreal y0 = sign(topLeft.y()) * (fabs(topLeft.y()) - fmod(fabs(topLeft.y()), gridSize)); |
| 111 if (isZero(fmod(value, 10.0))) | 111 |
| 112 glColor4f(0, 0, 0, 0.6); | 112 static const auto prepareGridLine = [](qreal value) -> bool |
| 113 { | |
| 114 if (not isZero(value)) | |
| 115 { | |
| 116 if (isZero(fmod(value, 10.0))) | |
| 117 glColor4f(0, 0, 0, 0.6); | |
| 118 else | |
| 119 glColor4f(0, 0, 0, 0.25); | |
| 120 | |
| 121 return true; | |
| 122 } | |
| 113 else | 123 else |
| 114 glColor4f(0, 0, 0, 0.25); | 124 { |
| 115 | 125 return false; |
| 116 return true; | 126 } |
| 117 } | 127 }; |
| 118 else | 128 |
| 119 { | 129 for (qreal x = x0; x < bottomRight.x(); x += gridSize) |
| 120 return false; | 130 { |
| 121 } | 131 if (prepareGridLine(x)) |
| 122 }; | 132 { |
| 123 | 133 glVertex(currentCamera().realize({x, -10000, 999})); |
| 124 for (qreal x = x0; x < bottomRight.x(); x += gridSize) | 134 glVertex(currentCamera().realize({x, 10000, 999})); |
| 125 { | 135 } |
| 126 if (prepareGridLine(x)) | 136 } |
| 127 { | 137 |
| 128 glVertex(currentCamera().realize({x, -10000, 999})); | 138 for (qreal y = y0; y < bottomRight.y(); y += gridSize) |
| 129 glVertex(currentCamera().realize({x, 10000, 999})); | 139 { |
| 130 } | 140 if (prepareGridLine(y)) |
| 131 } | 141 { |
| 132 | 142 glVertex(currentCamera().realize({-10000, y, 999})); |
| 133 for (qreal y = y0; y < bottomRight.y(); y += gridSize) | 143 glVertex(currentCamera().realize({10000, y, 999})); |
| 134 { | 144 } |
| 135 if (prepareGridLine(y)) | 145 } |
| 136 { | 146 } |
| 137 glVertex(currentCamera().realize({-10000, y, 999})); | 147 else |
| 138 glVertex(currentCamera().realize({10000, y, 999})); | 148 { |
| 149 const QPointF pole = grid()->pole(); | |
| 150 const qreal size = grid()->coordinateSnap(); | |
| 151 Vertex topLeft = currentCamera().idealize(currentCamera().convert2dTo3d({0, 0})); | |
| 152 Vertex bottomRight = currentCamera().idealize(currentCamera().convert2dTo3d({width(), height()})); | |
| 153 QPointF topLeft2d {topLeft.x(), topLeft.y()}; | |
| 154 QPointF bottomLeft2d {topLeft.x(), bottomRight.y()}; | |
| 155 QPointF bottomRight2d {bottomRight.x(), bottomRight.y()}; | |
| 156 QPointF topRight2d {bottomRight.x(), topLeft.y()}; | |
| 157 qreal smallestRadius = distanceFromPointToRectangle(pole, QRectF{topLeft2d, bottomRight2d}); | |
| 158 qreal largestRadius = max(QLineF {topLeft2d, pole}.length(), | |
| 159 QLineF {bottomLeft2d, pole}.length(), | |
| 160 QLineF {bottomRight2d, pole}.length(), | |
| 161 QLineF {topRight2d, pole}.length()); | |
| 162 | |
| 163 // Snap the radii to the grid. | |
| 164 smallestRadius = round(smallestRadius / size) * size; | |
| 165 largestRadius = round(largestRadius / size) * size; | |
| 166 | |
| 167 // Is the pole at (0, 0)? If so, then don't render the polar axes above the real ones. | |
| 168 bool poleIsOrigin = isZero(pole.x()) and isZero(pole.y()); | |
| 169 glColor4f(0, 0, 0, 0.25); | |
| 170 | |
| 171 // Render the axes | |
| 172 for (int i = 0; i < grid()->polarDivisions() / 2; ++i) | |
| 173 { | |
| 174 qreal azimuth = (2.0 * pi) * i / grid()->polarDivisions(); | |
| 175 | |
| 176 if (not poleIsOrigin or not isZero(fmod(azimuth, pi / 4))) | |
| 177 { | |
| 178 QPointF extremum = {cos(azimuth) * 10000, sin(azimuth) * 10000}; | |
| 179 QPointF A = pole + extremum; | |
| 180 QPointF B = pole - extremum; | |
| 181 glVertex(currentCamera().realize({A.x(), A.y(), 999})); | |
| 182 glVertex(currentCamera().realize({B.x(), B.y(), 999})); | |
| 183 } | |
| 184 } | |
| 185 | |
| 186 for (qreal radius = smallestRadius; radius <= largestRadius; radius += size) | |
| 187 { | |
| 188 if (not isZero(radius)) | |
| 189 { | |
| 190 Vertex points[48]; | |
| 191 | |
| 192 for (int i = 0; i < grid()->polarDivisions(); ++i) | |
| 193 { | |
| 194 qreal azimuth = (2.0 * pi) * i / grid()->polarDivisions(); | |
| 195 QPointF point = pole + QPointF {radius * cos(azimuth), radius * sin(azimuth)}; | |
| 196 points[i] = currentCamera().realize({point.x(), point.y(), 999}); | |
| 197 } | |
| 198 | |
| 199 for (int i = 0; i < grid()->polarDivisions(); ++i) | |
| 200 { | |
| 201 glVertex(points[i]); | |
| 202 glVertex(ring(points, grid()->polarDivisions())[i + 1]); | |
| 203 } | |
| 204 } | |
| 139 } | 205 } |
| 140 } | 206 } |
| 141 | 207 |
| 142 glEnd(); | 208 glEnd(); |
| 143 glDisable(GL_LINE_STIPPLE); | 209 glDisable(GL_LINE_STIPPLE); |
