CODEWITHSUNDEEP
c++sdl-2tiled
James
James

Reputation: 95

Moving tile by tile

I have done a map with Tiled. Every single tile of it measures 32x32 px so does my main character sprite.

In my class Player.cpp, I have some functions that calculates a deltaY/X which decide if you are going Left/Right/Up/Down and then you use them in the update function.

That's my code so far:

void Player::moveX(int moveDirection) {
    deltaX = moveDirection * PlayerConstants::WALK_SPEED;
    playAnimation(deltaX > 0 ? "WalkRight" : "WalkLeft");
    facing = deltaX > 0 ? DIRECTION ::RIGHT : DIRECTION::LEFT;
}

void Player::moveY(int moveDirection) {
    deltaY = moveDirection * PlayerConstants::WALK_SPEED;
    playAnimation(deltaY < 0 ? "WalkUp" : "WalkDown");
    facing = deltaY < 0 ? DIRECTION ::UP : DIRECTION::DOWN;
}

void Player::update(float elapsedTime) {
    _x += deltaX * elapsedTime;
    _y += deltaY * elapsedTime;

    AnimatedSprite::update(elapsedTime);
}

Walk Speed is 0.1 right now.

Any guesses on how to move it tile by tile?

Upvotes: 1

Views: 370

Answers (1)

travisjayday
travisjayday

Reputation: 814

Here's what you could do.

Create 2 global variables called, say, x_overflow and y_overflow. Now, in your update function, instead of directly adding deltaX and deltaY to _x and _y, add deltaX and deltaY to x_overflow and y_overflow. Then, add a couple if-statments checking if x_overflow and y_overflow are greater than your desired distance (i'm guessing 32px), and if they are, move your character by 32px.

Something like this

void Player::update(float elapsedTime) {
x_overflow += deltaX * elapsedTime;
y_overflow += deltaY * elapsedTime;

if (x_overflow >= 32) {
    _x += 32;
    x_overflow = 0;
}
else if (x_overflow <= -32) {
    _x -= 32;
    x_overflow = 0;
}

if (y_overflow >= 32) {
    _y += 32;
    y_overflow = 0;
}
else if (y_overflow <= -32) {
    _y -= 32;
    y_overflow = 0;
}

AnimatedSprite::update(elapsedTime);
}

I haven't really tested this code (i.e. don't copy paste), but you should understand the main idea behind it and implement it yourself. Good Luck!

Upvotes: 1

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