forked from kdx/jtmm2-old
59 lines
2.0 KiB
C
59 lines
2.0 KiB
C
#include <gint/display.h>
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#include "camera.h"
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#include "conf.h"
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#include "vec.h"
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#include "player.h"
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#include "level.h"
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void camera_step(Camera *camera)
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{
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/* lerp towards target */
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vec_lerp(&camera->pos, *camera->target, camera->speed);
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/* put the camera in the right place */
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vec_clamp(&camera->pos, camera->min, camera->max);
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/* calculate pixel offset */
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Vec * const offset = &camera->offset; /* DRY */
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vec_cpy(offset, camera->pos);
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vec_div(offset, VEC_PRECISION);
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vec_sub(offset, VEC_SCALED_DCENTER);
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}
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void camera_init(Camera *camera, Player *player, const Level *level)
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{
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/* NOTE: This system doesn't totally works, but it's good enough for now. */
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/* check level size */
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const Vec level_dim = {level->width * (TILE_SIZE / VEC_PRECISION * SCALE),
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level->height * (TILE_SIZE / VEC_PRECISION * SCALE)};
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if (level_dim.x > DWIDTH || level_dim.y > DHEIGHT)
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{
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/* level cannot be displayed on a single screen */
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/* calculate min and max */
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vec_cpy(&camera->min, VEC_SCALED_DCENTER);
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vec_mul(&camera->min, VEC_PRECISION);
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vec_cpy(&camera->max, (Vec){0, 0});
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vec_sub(&camera->max, VEC_SCALED_DCENTER);
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vec_mul(&camera->max, VEC_PRECISION);
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vec_add(&camera->max, (Vec){TILE_SIZE * level->width, TILE_SIZE * level->height});
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vec_cpy(&camera->pos, player->pos);
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}
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else
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{
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/* level is single screen */
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/* We calculate the offset and setup the camera to center everything. */
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const Vec screen_center_precise = {level->width * TILE_SIZE / (2 * SCALE),
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level->height * TILE_SIZE / (2 * SCALE)};
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vec_cpy(&camera->min, screen_center_precise);
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vec_cpy(&camera->max, screen_center_precise);
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}
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vec_clamp(&camera->pos, camera->min, camera->max);
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}
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void camera_draw_debug(Camera *camera)
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{
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dprint(0, 0, C_BLACK, "-x: %d, -y: %d", camera->min.x, camera->min.y);
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dprint(0, 10, C_BLACK, "+x: %d, +y: %d", camera->max.x, camera->max.y);
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dprint(0, 20, C_BLACK, "cx: %d, cy: %d", camera->pos.x, camera->pos.y);
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dprint(0, 30, C_BLACK, "px: %d, py: %d", camera->offset.x, camera->offset.y);
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}
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