player.cpp as of 2024-03-21

#include <player.hpp>

#include <math.h>

using namespace kit;





#define VELX_MAX (1.5f)
#define VELY_MAX (2.5f)
#define MID_AIR (ticksInAir>1 || jumped)





#define RND_AMOUNT (0.5f) //0.5f for rounding, 0.0f for truncation
#define RND(_v) ( (s32)((_v)+RND_AMOUNT) )
#define TILE_SIZE (8) //actual sprite is 8x8
#define TILE_ADJUST(_v) ((_v)*(TILE_SIZE+1)) //+1 for one pixel of spacing

void Player::blit(kit::f32 scaleX, kit::f32 scaleY){ //scale is 1x by default
  if(!visible || scaleX<=0.0f || scaleY<=0.0f) return;

  shape::rect dst;
  dst.w = (s32)( TILE_SIZE*scaleX );
  dst.h = (s32)( TILE_SIZE*scaleY );
  dst.x = RND(pos.x) - (dst.w/2);
  dst.y = RND(pos.y) - (dst.h/2);

  shape::rect src(0,0, TILE_SIZE,TILE_SIZE);
  if(confused    ) src.y += TILE_ADJUST(1);
  if(!facingRight) src.y += TILE_ADJUST(2);



  // >1 instead of >0 to account for ghost step
  if(MID_AIR){ //mid-air
    if(fabsf(vel.x) > PLAYER_NEUTRAL){ //going fast horizontally
      if(vel.y<=0) src.x = TILE_ADJUST(2); //-Y; back leg extended
      else         src.x = TILE_ADJUST(8); //+Y; front leg extended
    } else { //going slow (or not at all) horizontally
      if(     vel.y <-PLAYER_NEUTRAL) src.x = TILE_ADJUST(1); //-Y; back leg down
      else if(vel.y > PLAYER_NEUTRAL) src.x = TILE_ADJUST(4); //+Y; front leg down
      else                            src.x = TILE_ADJUST(7); //0Y; both legs up
    }

  } else { //on the ground
      if(vel.x < 0  &&  acc.x > 0){ //slowing down while moving left
        if(fabsf(vel.x) > PLAYER_NEUTRAL){ //going fast horizontally
          if(facingRight) src.x = TILE_ADJUST(2); //back leg extended
          else            src.x = TILE_ADJUST(8); //front leg extended
        } else { //going slow (or not at all) horizontally
          if(facingRight) src.x = TILE_ADJUST(1); //back leg down
          else            src.x = TILE_ADJUST(4); //front leg down
        }

      } else if(vel.x > 0  &&  acc.x < 0){ //slowing down while moving right
        if(fabsf(vel.x) > PLAYER_NEUTRAL){ //going fast horizontally
          if(facingRight) src.x = TILE_ADJUST(8); //front leg extended
          else            src.x = TILE_ADJUST(2); //back leg extended
        } else { //going slow (or not at all) horizontally
          if(facingRight) src.x = TILE_ADJUST(4); //front leg down
          else            src.x = TILE_ADJUST(1); //back leg down
        }

      } else if(fabsf(vel.x) > PLAYER_NEUTRAL){ //moving forward
        src.x = TILE_ADJUST(1 + RND(runningState)%6);

      } else if(acc.x < 0){ //standing still while accelerating left
        if(facingRight) src.x = TILE_ADJUST(4); //front leg down
        else            src.x = TILE_ADJUST(1); //back leg down

      } else if(acc.x > 0){ //standing still while accelerating right
        if(facingRight) src.x = TILE_ADJUST(1); //back leg down
        else            src.x = TILE_ADJUST(4); //front leg down

      } else { //standing still without acceleration
        src.x = TILE_ADJUST(0); //technically redundant, but left here for clarity

      }

  }



  //0xff00ff for magenta as the transparency color
  gl_spritesheetPlayer->blitRect(&dst, &src, 0xff00ff);
}





//acc, visible, and confused are not modified here
void Player::update(){
  vel.x += (MID_AIR) ? acc.x*PLAYER_AIR_FRICTION : acc.x;
  vel.y += acc.y;
  if(enforceMaxVel){
    vel.x = CLAMP(vel.x, -VELX_MAX, VELX_MAX);
    vel.y = CLAMP(vel.y, -VELY_MAX, VELY_MAX);
  }
  pos += vel;


  if(fabsf(vel.x)<0.05f && acc.x==0) vel.x = 0.0f;


  if(ticksInAir <= 1  &&  vel.x != 0){ //if on ground while moving horizontally
    facingRight = vel.x > 0;
    if(ticksInAir <= 1  &&  acc.x == 0){
      vel.x -= (vel.x>0) ?  PLAYER_SPEED*PLAYER_GND_FRICTION
                         : -PLAYER_SPEED*PLAYER_GND_FRICTION;
    }
  }


  f32 prevRunningState = runningState;

  if(fabs(vel.x) > PLAYER_NEUTRAL) runningState += fabsf(vel.x)*PLAYER_RUN_MUL;
  else                             runningState  = 0.0f;
  runningState = fmodf(fabsf(runningState), 6.0f);

  //used to indicate that a foot step sound effect should play
  if(prevRunningState < 1.0f  &&  runningState >= 1.0f  &&  !MID_AIR) footstep = true;
}