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Diffstat (limited to 'engines/sci/engine/kmath.cpp')
| -rw-r--r-- | engines/sci/engine/kmath.cpp | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/engines/sci/engine/kmath.cpp b/engines/sci/engine/kmath.cpp index 7570856dff..4b8fadbb84 100644 --- a/engines/sci/engine/kmath.cpp +++ b/engines/sci/engine/kmath.cpp @@ -77,7 +77,18 @@ reg_t kSqrt(EngineState *s, int argc, reg_t *argv) { return make_reg(0, (int16) sqrt((float) ABS(argv[0].toSint16()))); } +/** + * Returns the angle (in degrees) between the two points determined by (x1, y1) + * and (x2, y2). The angle ranges from 0 to 359 degrees. + * What this function does is pretty simple but apparently the original is not + * accurate. + */ uint16 kGetAngleWorker(int16 x1, int16 y1, int16 x2, int16 y2) { + // SCI1 games (QFG2 and newer) use a simple atan implementation. SCI0 games + // use a somewhat less accurate calculation (below). + if (getSciVersion() >= SCI_VERSION_1_EGA_ONLY) + return (int16)(360 - atan2((double)(x1 - x2), (double)(y1 - y2)) * 57.2958) % 360; + int16 xRel = x2 - x1; int16 yRel = y1 - y2; // y-axis is mirrored. int16 angle; |