platform-test/player.cpp

//Player class cpp

#include"player.h"

void Player::print(){	
	rect = {posX,posY,szW,szH};

	SDL_SetRenderDrawColor(*renderer,0xFF,0,0,0xFF);
	SDL_RenderFillRect(*renderer, &rect);

	oldPosX = posX;
	oldPosY = posY;		
	move();
	ground = false;
	topCollision = false;
};

void Player::init(int x,int y, int w, int h, SDL_Renderer** render){
	posX = x;
	posY = y;
	szW = w;
	szH = h;
	renderer = render;

	oldPosX = posX;
	oldPosY = posY; };

int Player::intVelX(){
	return static_cast<int>(velocityX);
};

void Player::move(){
	//float dt = dTime.getDt();
	float dt = 0.016;
		
	const Uint8* currentKeyStates = SDL_GetKeyboardState(NULL);
	
	//Intializing variables
	int direction = 0; //1 = right, 0 = idle/both, -1 = left
	int dur = 4; //Divide transition time
	int speed = 200; //Horizontal movement speed
	float run = 1.5; //Running speed multiplication
	//static bool isRunning = false;

	int gravity = 800; //Gravity force
	int jump = 500; //Jump force

	if(currentKeyStates[SDL_SCANCODE_LEFT]) direction += -1;
	if(currentKeyStates[SDL_SCANCODE_RIGHT]) direction += 1;
	if(!currentKeyStates[SDL_SCANCODE_LSHIFT] and !isRunning) run = 1;
	if(run!=1) dur /= 1;

	if(direction == 1 and intVelX() < speed){
		velocityX += speed * dt * dur;
		if(intVelX() > speed) velocityX = speed;
		}
	if(direction == -1 and intVelX() > -speed){
		velocityX -= speed * dt * dur;
		if(intVelX() < -speed) velocityX = -speed;
		}
	if(direction == 0 and velocityX != 0)
		if(intVelX() > 0){
			velocityX -= speed * dt * dur;
			if(intVelX() < 0) velocityX = 0;
		}
		else if(intVelX() < 0){
			velocityX += speed * dt * dur;
			if(intVelX() > 0) velocityX = 0;
		}
		else if(velocityX <= 1 or velocityX >= -1) velocityX = 0;
	
	//Jump and gravity key logic
	if(ground){
		isRunning = false;
		if(currentKeyStates[SDL_SCANCODE_SPACE] and !topCollision){
			velocityY = jump;
			if(run!=1){
				isRunning = true;
			}
		}
	}
	else{
		if(isRunning == false) run = 1;
	}
	
	velocityY -= gravity * dt;
	float x = velocityX * dt * run;
	float y = velocityY * dt;
	
	//Convert and set new int position
	posX += static_cast<int>(x);
	posY -= static_cast<int>(y+0.5);
};

int Player::check(SDL_Rect rectA){
	//Initialize and reset collision type
	int collision = 0;

	//Set B rectangle variables
	int bX = rectA.x;
	int bY = rectA.y;
	int b2X = rectA.x + rectA.w;
	int b2Y = rectA.y + rectA.h;

	//Float-ize the position
	float movX = posX, movY = posY;

	//Clacule the opposite od the player direction angle
	float angle = atan2(oldPosY - posY, oldPosX - posX);

	//Move the player out of the rectangle
	while(((movX >= bX and movX < b2X)
	or (movX + szW > bX and movX + szW <= b2X))
	and ((movY >= bY and movY < b2Y)
	or (movY + szH > bY and movY + szH <= b2Y))){
		movX += cos(angle) / 2;
		movY += sin(angle) / 2;
		collision = 1;
	}

	//Correct possible position issues
	if(collision == 1){
		//Vertical adjustement
		if((movX > bX and movX < b2X)
		or (movX + szW > bX and movX + szW < b2X)){
			while(movY + szH < bY){
				movY++;
				velocityY = 0;
			}
			while(movY - 1 > b2Y){
				movY--;
			}
		}
		//Horizontal adjustement
		if((movY > bY and movY < b2Y)
		or (movY + szH > bY and movY + szH < b2Y)){
			while(movX + szW < bX){
				movX++;
			}
			while(posX > b2X){
				movX--;
			}
		}
	}

	//Set and int-ize the position
	posX = static_cast<int>(movX);
	posY = static_cast<int>(movY);

	//Check collsion type and reset velocities
	//Vertical collisions
	if((posX >= bX and posX < b2X)
	or (posX + szW > bX and posX + szW <= b2X)){
		//Top collision
		if(posY + szH == bY){
			ground = true;
			collision = 2;
			velocityY = 0;
		}
		//Bottom collision
		else if(posY == b2Y){
			collision = 3;
			topCollision = true;
			if(velocityY > 0)
				velocityY -= static_cast<int>(velocityY);
		}
	}
	//Horizontal collisions
	if((posY >= bY and posY < b2Y)
	or (posY + szH > bY and posY + szH <= b2Y)){
		//Left collision
		if(posX + szW == bX){
			collision = 4;
			if(velocityX > 0)
				velocityX -= static_cast<int>(velocityX);
		}
		//Right collision
		else if(posX == b2X){
			collision = 5;
			if(velocityX < 0)
				velocityX -= static_cast<int>(velocityX);
		}
	}
};