Name: Anonymous 2007-04-13 0:28 ID:n4ihaNU4
All right.. im trying to make a generic animation class for a small game im working on for PSP (homebrew, whee!), but im still pretty rusty when it comes to C++. To me it seems like this class SHOULD work fine, but for some reason its not!
Then i do:
What should happen is i should get a value that increases up to 255 on the 50th frame, but what is happening is I just get '255' constantly! The code looks fine to me, ive been messing with it all night!
Anyone got an idea why it wont work?
class Animation {
private:
int frame;
float beginValue;
float targetValue;
int length;
int animType;
public:
float currentValue;
bool done;
bool paused;
Animation(float startNum, float endNum, int totalSteps, int type) {
Reset(startNum,endNum,totalSteps,type);
}
void Reset(float startNum, float endNum, int totalSteps, int type) { // Make object reusable
frame = 0;
done = false;
paused = true;
currentValue = startNum;
beginValue = startNum;
targetValue = endNum;
length = totalSteps;
animType = type;
}
void Start() {
paused = false;
done = false;
}
void Stop() {
frame = 0;
done = true;
currentValue = 0;
beginValue = 0;
targetValue = 0;
length = 0;
}
void Pause() {
paused = true;
}
void Unpause() {
paused = false;
}
float Step() {
if (paused || done) return currentValue;
frame++;
if (frame>=length) {
done = true;
currentValue = targetValue;
return 0;
}
float delta = targetValue-beginValue;
switch (animType) {
case ANIM_LINEAR:
// TODO: Other animations
break;
case ANIM_EASEIN:
float n = frame/length;
currentValue = delta*n*n*n+beginValue;
return currentValue;
}
return currentValue;
}
};Then i do:
Animation *animator = new Animation(0,255,50,ANIM_EASEIN); // Create new animator for alpha
animator->Start();
...
//Then, every frame,
animator->Step();
// Then when drawing my sprite, i use animator->currentValue for the alphaWhat should happen is i should get a value that increases up to 255 on the 50th frame, but what is happening is I just get '255' constantly! The code looks fine to me, ive been messing with it all night!
Anyone got an idea why it wont work?