63 lines
1.4 KiB
C
63 lines
1.4 KiB
C
#include <camera.h>
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#include <camera_private.h>
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#include <gfx.h>
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#include <mouse.h>
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#include <util.h>
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#include <stdbool.h>
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static void cursor_update(struct cursor *const c, const struct mouse *const m)
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{
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if (c->screen.last_w != screen_w
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|| c->screen.last_h != screen_h)
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cursor_init(c);
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c->x = m->x;
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c->y = m->y;
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}
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static void update_speed(struct camera *const cam, const struct mouse *const m)
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{
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enum
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{
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MAX_SPEED = 10,
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STEP = 1,
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THRESHOLD_X = CAMERA_CURSOR_WIDTH / 2,
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THRESHOLD_Y = CAMERA_CURSOR_HEIGHT / 2
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};
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const struct cursor *const c = &cam->cursor;
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if (c->x >= screen_w - THRESHOLD_X)
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{
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if (cam->x_speed - STEP > -MAX_SPEED)
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cam->x_speed -= STEP;
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}
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else if (c->x < THRESHOLD_X)
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{
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if (cam->x_speed + STEP < MAX_SPEED)
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cam->x_speed += STEP;
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}
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else
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cam->x_speed = 0;
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if (c->y >= screen_h - THRESHOLD_Y)
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{
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if (cam->y_speed - STEP > -MAX_SPEED)
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cam->y_speed -= STEP;
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}
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else if (c->y < THRESHOLD_Y)
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{
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if (cam->y_speed + STEP < MAX_SPEED)
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cam->y_speed += STEP;
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}
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else
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cam->y_speed = 0;
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}
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void camera_update_mouse(struct camera *const cam, const struct mouse *const m)
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{
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cursor_update(&cam->cursor, m);
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update_speed(cam, m);
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camera_update_pos(cam);
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}
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