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rootston: rotation by steps

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emersion 2017-10-04 22:01:54 +02:00
parent 09a6d863cf
commit 3b226ba81a
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1 changed files with 3 additions and 0 deletions
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rootston/cursor.c
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@ -1,3 +1,4 @@
#define _XOPEN_SOURCE 500
#include <stdbool.h>
#include <stdint.h>
#include <string.h>
@ -114,6 +115,8 @@ void cursor_update_position(struct roots_input *input, uint32_t time) {
int vx = input->cursor->x - ox,
vy = input->cursor->y - oy;
float angle = atan2(vx*uy - vy*ux, vx*ux + vy*uy);
int steps = 12;
angle = round(angle/M_PI*steps) / (steps/M_PI);
view->rotation = input->view_rotation + angle;
}
break;