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properly use angles from 0 to 2PI (0 to 360°)

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fixes https://pulkomandy.tk/projects/GrafX2/ticket/129
This commit is contained in:
Thomas Bernard 2020-01-04 13:02:53 +01:00
parent cd2552e935
commit e152b75f4a
1 changed files with 12 additions and 8 deletions
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20
src/brush_ops.c
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@ -952,7 +952,6 @@ void Rotate_brush_1_5(void)
short old_y; short old_y;
short prev_state; short prev_state;
double angle; double angle;
int dx,dy;
short cursor_x,cursor_y; short cursor_x,cursor_y;
Operation_pop(&prev_state); Operation_pop(&prev_state);
@ -972,9 +971,12 @@ void Rotate_brush_1_5(void)
angle=0.0; angle=0.0;
else else
{ {
dx=cursor_x-Brush_rotation_center_X; // Angle from 0 to 2 PI
dy=cursor_y-Brush_rotation_center_Y; int dx = cursor_x - Brush_rotation_center_X;
angle=M_2PI-atan2((double)dy,(double)dx); int dy = cursor_y - Brush_rotation_center_Y;
angle = 0.0 - atan2((double)dy, (double)dx);
if (angle < 0.0)
angle += M_2PI;
} }
if (Menu_is_visible) if (Menu_is_visible)
@ -1022,7 +1024,6 @@ void Rotate_brush_0_5(void)
byte angle_change; byte angle_change;
short prev_state; short prev_state;
double angle=0.0; double angle=0.0;
int dx,dy;
short cursor_x, cursor_y; short cursor_x, cursor_y;
@ -1044,9 +1045,12 @@ void Rotate_brush_0_5(void)
angle=0.0; angle=0.0;
else else
{ {
dx=cursor_x-Brush_rotation_center_X; // Angle from 0 to 2 PI
dy=cursor_y-Brush_rotation_center_Y; int dx = cursor_x - Brush_rotation_center_X;
angle=M_2PI-atan2((double)dy, (double)dx); int dy = cursor_y - Brush_rotation_center_Y;
angle = 0.0 - atan2((double)dy, (double)dx);
if (angle < 0.0)
angle += M_2PI;
} }
if (Menu_is_visible) if (Menu_is_visible)