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Properly scale the objects before drawing

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hasufell 2014-05-09 19:47:05 +02:00
parent 6725dcf5ab
commit d0dfba689b
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GPG Key ID: 220CD1C5BDEED020
1 changed files with 37 additions and 0 deletions
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37
src/gl_draw.c
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@ -38,6 +38,7 @@
#define SYSTEM_POS_Z -15.0f
#define SYSTEM_POS_Z_BACK 15.0f
#define VISIBILITY_FACTOR 5.0f
int year;
int yearabs = 365;
@ -55,6 +56,38 @@ static void gl_destroy(void);
static HE_vert *find_center(HE_obj const * const obj);
/**
* Scales down the object to the size of 1.
*
* @param the object we want to scale
*/
static float scale_object_normalized(HE_obj const * const obj)
{
float max = obj->vertices[0].x +
obj->vertices[0].y + obj->vertices[0].z;
float min = obj->vertices[0].x +
obj->vertices[0].y + obj->vertices[0].z;
uint32_t i;
for (i = 0; i < obj->vc; i++) {
if ((obj->vertices[i].x +
obj->vertices[i].y +
obj->vertices[i].z) > max)
max = obj->vertices[i].x +
obj->vertices[i].y +
obj->vertices[i].z;
else if ((obj->vertices[i].x +
obj->vertices[i].y +
obj->vertices[i].z) < min)
min = obj->vertices[i].x +
obj->vertices[i].y +
obj->vertices[i].z;
}
return 1 / (max - min);
}
/**
* Find the center of an object and store the coordinates
* in a HE_vert struct.
@ -119,6 +152,7 @@ static void draw_obj(uint32_t const myxrot,
yrot = 0,
zrot = 0;
HE_vert *center_vert = find_center(obj);
float scalefactor = scale_object_normalized(obj) * VISIBILITY_FACTOR;
xrot += myxrot;
yrot += myyrot;
@ -128,6 +162,9 @@ static void draw_obj(uint32_t const myxrot,
/* rotate according to static members */
glTranslatef(0.0f, 0.0f, SYSTEM_POS_Z);
glScalef(scalefactor,
scalefactor,
scalefactor);
glRotatef(xrot, 1.0f, 0.0f, 0.0f);
glRotatef(yrot, 0.0f, 1.0f, 0.0f);
glRotatef(zrot, 0.0f, 0.0f, 1.0f);