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// SPDX-License-Identifier: GPL-2.0-or-later
/* SPDX-FileCopyrightText: 2004-2015 Simon Wunderlich <sw@simonwunderlich.de>
*/
#include <s3d.h>
#include <s3d_keysym.h>
#include <stdio.h>
#include <math.h>
#include <time.h>
static struct timespec t = {
0, 10*1000*1000
}; /* 10 mili seconds */
static int object, foll;
static float al, r, alpha = 0.0, angle;
static float CamPosition[2][3],
TmpMove[3],
Tmp[3],
RotCam[2][3],
CatPos[3];
static float length;
static void mainloop(void)
{
al = (alpha * (float)M_PI / 180.f);
r = 5.0f;
CatPos[0] = sinf(al) * r;
CatPos[1] = 0;
CatPos[2] = cosf(al) * r;
s3d_translate(object, CatPos[0] , CatPos[1], CatPos[2]);
s3d_rotate(object, 0, alpha, 0);
alpha = alpha + 0.1f;
if (alpha > 360.0f) alpha = 0.0f;
length = s3d_vector_length(CatPos);
RotCam[0][0] = (CatPos[0] * 12.0f) / length;
RotCam[0][1] = (CatPos[1] * 12.0f) / length;
RotCam[0][2] = (CatPos[2] * 12.0f) / length;
if (foll) {
CamPosition[0][0] = ((CamPosition[0][0] * 4 + RotCam[0][0]) / 5);
CamPosition[0][1] = ((CamPosition[0][1] * 4 + RotCam[0][1]) / 5);
CamPosition[0][2] = ((CamPosition[0][2] * 4 + RotCam[0][2]) / 5);
s3d_translate(0, CamPosition[0][0], CamPosition[0][1], CamPosition[0][2]);
TmpMove[0] = 0.0;
TmpMove[1] = 0.0;
TmpMove[2] = -1.0;
Tmp[0] = CamPosition[0][0] - CatPos[0];
Tmp[1] = 0.0;
Tmp[2] = CamPosition[0][2] - CatPos[2];
angle = s3d_vector_angle(Tmp, TmpMove);
angle = (CatPos[0] > 0) ? (180.f - (180.f / (float)M_PI * angle)) : (180.f + (180.f / (float)M_PI * angle));
printf("%f %f\n", angle, al);
CamPosition[1][1] = (CamPosition[1][1] * 4 + angle) / 5;
s3d_rotate(0, CamPosition[1][0], CamPosition[1][1], CamPosition[1][2]);
}
nanosleep(&t, NULL);
}
static int object_info(struct s3d_evt *hrmz)
{
struct s3d_obj_info *inf;
inf = (struct s3d_obj_info *)hrmz->buf;
if (inf->object == 0) {
CamPosition[0][0] = inf->trans_x;
CamPosition[0][1] = inf->trans_y;
CamPosition[0][2] = inf->trans_z;
CamPosition[1][0] = inf->rot_x;
CamPosition[1][1] = inf->rot_y;
CamPosition[1][2] = inf->rot_z;
}
return 0;
}
static int keypress(struct s3d_evt *event)
{
int key;
key = *((unsigned short *)event->buf);
switch (key) {
default:
;
}
return 0;
}
int main(int argc, char **argv)
{
if (!s3d_init(&argc, &argv, "running cat")) {
s3d_set_callback(S3D_EVENT_KEY, keypress);
s3d_set_callback(S3D_EVENT_OBJ_INFO, object_info);
object = s3d_import_model_file("objs/katze_body.3ds");
s3d_flags_on(object, S3D_OF_VISIBLE);
s3d_mainloop(mainloop);
s3d_quit();
}
return 0;
}
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