comparison: src/algorithms/geometry.cpp
src/algorithms/geometry.cpp
- changeset 1325
- f9abfc7ba676
- parent 1319
- 39d7a9642eea
- child 1326
- 69a90bd2dba2
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| 1324:563a9b65777b | 1325:f9abfc7ba676 |
|---|---|
| 1 #include "geometry.h" | 1 #include "geometry.h" |
| 2 | 2 |
| 3 /* | 3 /* |
| 4 * getRadialPoint | 4 * LDraw uses 4 points of precision for sin and cos values. Primitives must be generated |
| 5 * | 5 * accordingly. |
| 6 * Gets an ordinate of a point in circle. | |
| 7 * If func == sin, then this gets the Y co-ordinate, if func == cos, then X co-ordinate. | |
| 8 */ | 6 */ |
| 9 QPointF pointOnCircumference(int segment, int divisions) | 7 double ldrawsin(double angle) |
| 8 { | |
| 9 return roundToDecimals(sin(angle), 4); | |
| 10 } | |
| 11 | |
| 12 double ldrawcos(double angle) | |
| 13 { | |
| 14 return roundToDecimals(cos(angle), 4); | |
| 15 } | |
| 16 | |
| 17 /* | |
| 18 * Returns a point on a circumference. LDraw precision is used. | |
| 19 */ | |
| 20 QPointF pointOnLDrawCircumference(int segment, int divisions) | |
| 10 { | 21 { |
| 11 double angle = (segment * 2 * pi) / divisions; | 22 double angle = (segment * 2 * pi) / divisions; |
| 12 return {cos(angle), sin(angle)}; | 23 return {ldrawcos(angle), ldrawsin(angle)}; |
| 13 } | 24 } |
| 14 | 25 |
| 15 /* | 26 /* |
| 16 * makeCircle | 27 * makeCircle |
| 17 * | 28 * |
| 27 { | 38 { |
| 28 QVector<QLineF> lines; | 39 QVector<QLineF> lines; |
| 29 | 40 |
| 30 for (int i = 0; i < segments; i += 1) | 41 for (int i = 0; i < segments; i += 1) |
| 31 { | 42 { |
| 32 QPointF p0 = radius * ::pointOnCircumference(i, divisions); | 43 QPointF p0 = radius * ::pointOnLDrawCircumference(i, divisions); |
| 33 QPointF p1 = radius * ::pointOnCircumference(i + 1, divisions); | 44 QPointF p1 = radius * ::pointOnLDrawCircumference(i + 1, divisions); |
| 34 lines.append({p0, p1}); | 45 lines.append({p0, p1}); |
| 35 } | 46 } |
| 36 | 47 |
| 37 return lines; | 48 return lines; |
| 38 } | 49 } |
