104 lines
2.1 KiB
C
104 lines
2.1 KiB
C
#include <gint/display.h>
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#include <gint/defs/util.h>
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#include "animation.h"
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#include "engine.h"
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//---
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// Generation of animation frames from sheets
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//---
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/* struct sheet: Structure of an image with animation frames */
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struct sheet
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{
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/* Source image */
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bopti_image_t *img;
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/* Width and height of single entry */
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int frame_w;
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int frame_h;
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};
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extern bopti_image_t img_spritesheet;
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struct sheet const anim_player = {
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.img = &img_spritesheet,
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.frame_w = 12,
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.frame_h = 16,
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};
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/* anim_frame(): Get a frame from a sheet */
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static struct anim_frame anim_frame(struct sheet const *sheet, int col,int row)
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{
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struct anim_frame f = {
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.source = sheet->img,
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.left = sheet->frame_w * col,
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.top = sheet->frame_h * row,
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.w = sheet->frame_w,
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.h = sheet->frame_h,
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};
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return f;
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}
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void dframe(int x, int y, struct anim_frame const frame)
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{
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dsubimage(x, y, frame.source, frame.left, frame.top, frame.w, frame.h,
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DIMAGE_NONE);
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}
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//---
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// Animation functions
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//---
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int anim_player_idle(struct anim_data *data, int init)
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{
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/* Animation initialization; takes [data->dir] as input */
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if(init)
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{
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data->function = anim_player_idle;
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data->frame = 0;
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data->duration = 500;
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}
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else
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{
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data->frame = (data->frame + 1) % 2;
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data->duration += 500;
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}
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data->img = anim_frame(&anim_player, data->dir, data->frame);
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data->dx = 0;
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data->dy = 0;
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return 0;
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}
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int anim_player_walking(struct anim_data *data, int init)
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{
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/* Animation initialization; takes [data->dir] as input */
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if(init)
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{
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data->function = anim_player_walking;
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data->frame = 0;
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data->duration = 50;
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int dx = (data->dir == DIR_LEFT) - (data->dir == DIR_RIGHT);
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int dy = (data->dir == DIR_UP) - (data->dir == DIR_DOWN);
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data->dx = 10 * dx;
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data->dy = 10 * dy;
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}
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else
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{
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data->dx -= sgn(data->dx);
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data->dy -= sgn(data->dy);
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/* Animation finishes if both displacements are zero */
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if(!data->dx && !data->dy)
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{
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return anim_player_idle(data, 1);
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}
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data->frame = (data->frame + 1) % 8;
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data->duration += 50;
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}
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data->img = anim_frame(&anim_player, data->dir + 4, data->frame / 2);
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return 1;
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}
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