paysages3d/lib_paysages/modifiers.c
2011-12-23 22:00:19 +00:00

75 lines
1.5 KiB
C

#include "shared/types.h"
#include "shared/functions.h"
#include <stdlib.h>
typedef enum
{
MODE_NULL,
MODE_ADD_VALUE,
MODE_FIX_VALUE
} _EnumMode;
struct HeightModifier
{
Zone* zone;
_EnumMode mode;
double value;
};
HeightModifier* modifierCreate()
{
HeightModifier* modifier;
modifier = (HeightModifier*)malloc(sizeof(HeightModifier));
modifier->zone = zoneCreate();
modifier->mode = MODE_NULL;
return modifier;
}
void modifierDelete(HeightModifier* modifier)
{
zoneDelete(modifier->zone);
free(modifier);
}
Zone* modifierGetZone(HeightModifier* modifier)
{
return modifier->zone;
}
void modifierActionAddValue(HeightModifier* modifier, double value)
{
modifier->mode = MODE_ADD_VALUE;
modifier->value = value;
}
void modifierActionFixValue(HeightModifier* modifier, double value)
{
modifier->mode = MODE_FIX_VALUE;
modifier->value = value;
}
Vector3 modifierApply(HeightModifier* modifier, Vector3 location)
{
double influence, diff;
Vector3 normal;
switch (modifier->mode)
{
case MODE_ADD_VALUE:
influence = zoneGetValue(modifier->zone, location, normal);
location.y += modifier->value * influence;
break;
case MODE_FIX_VALUE:
influence = zoneGetValue(modifier->zone, location, normal);
diff = modifier->value - location.y;
location.y += diff * influence;
break;
case MODE_NULL:
break;
}
return location;
}