using user-defined data type as data-member of a class.

Tarun Jha

Here is a class called Animation, and it has a function called Update as shown in the code below.

class Animation
{
private:
Vector2u imageCount; // contains the number of total images in row and total no. of coloumns , in this case (3, 9)
Vector2u currentImage; // acts as the limiter.
float totalTime; // the total time taken by whole animation.
float switchTime; // the time duration btw to images.

public:
// Texture * texture -> takes the whole image.
// Vector2u imageCount -> counts the number of images in each row, and total number of coloumn.
// float switchTime -> time btw 2 images.
Animation(Texture* texture, Vector2u imageCount, float switchTime);
~Animation();

IntRect uvRect;						// sets the height, width, top, and left corner of the image to be printed on the screen.

void Update(int row, float deltaTime, bool faceRight );		// float deltaTime -> gives the FPS of the machine, acc. to which the switch bte images is maintained.

};
Animation::Animation(Texture* texture, Vector2u imageCount, float switchTime) {
this->imageCount = imageCount;
this->switchTime = switchTime;
totalTime = 0.0f;

// here we have set the initial image position-> first position
currentImage.x = 0;
currentImage.y = 0;

// here we are setting height & width of each image.
uvRect.width = texture->getSize().x / static\_cast(imageCount.x);
uvRect.height = texture->getSize().y / static\_cast(imageCount.y);

}

Animation::~Animation()
{
}

// this is the function i am talking about
// it takes argument which are the data members of player class.
void Animation::Update(int row, float deltaTime, bool faceRight) {
currentImage.y = row;
totalTime += deltaTime; // deltaTime is added to the totalTime.

if (totalTime >= switchTime) {
	totalTime -= switchTime;
	currentImage.x++;								// every time totalTime >= switchTime, incrementing currentImage.x

	if (currentImage.x >= imageCount.x) {			// when currentImage.x >= imageCount.x, the currentImage.x = 0.	
		currentImage.x = 0;	
	}
}

uvRect.top = currentImage.y \* uvRect.height;

// to turn the player to each side, left or right.
if (faceRight) {
	uvRect.left = currentImage.x \* uvRect.width;			// if the faceRight is True.
	uvRect.width = abs(uvRect.width) ;
}
else {
	uvRect.left = (currentImage.x + 1) \* abs(uvRect.width);		// if the faceRight is false .
	uvRect.width = -abs(uvRect.width);

}

}

and the is 2nd class called player, in which i have