src/player.cpp

   1 //  $Id$
   2 //
   3 //  SuperTux -  A Jump'n Run
   4 //  Copyright (C) 2003 Tobias Glaesser <tobi.web@gmx.de>
   5 //
   6 //  This program is free software; you can redistribute it and/or
   7 //  modify it under the terms of the GNU General Public License
   8 //  as published by the Free Software Foundation; either version 2
   9 //  of the License, or (at your option) any later version.
  10 //
  11 //  This program is distributed in the hope that it will be useful,
  12 //  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 //  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 //  GNU General Public License for more details.
  15 //
  16 //  You should have received a copy of the GNU General Public License
  17 //  along with this program; if not, write to the Free Software
  18 //  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  19
  20 #include <math.h>
  21 #include "gameloop.h"
  22 #include "globals.h"
  23 #include "player.h"
  24 #include "defines.h"
  25 #include "scene.h"
  26 #include "tile.h"
  27 #include "sprite.h"
  28 #include "screen.h"
  29
  30 Surface* tux_life;
  31
  32 Sprite* smalltux_gameover;
  33 Sprite* smalltux_star;
  34 Sprite* largetux_star;
  35
  36 PlayerSprite smalltux;
  37 PlayerSprite largetux;
  38 PlayerSprite firetux;
  39
  40 PlayerKeymap keymap;
  41
  42 PlayerKeymap::PlayerKeymap()
  43 {
  44   keymap.jump  = SDLK_UP;
  45   keymap.duck  = SDLK_DOWN;
  46   keymap.left  = SDLK_LEFT;
  47   keymap.right = SDLK_RIGHT;
  48   keymap.fire  = SDLK_LCTRL;
  49 }
  50
  51 void player_input_init(player_input_type* pplayer_input)
  52 {
  53   pplayer_input->down = UP;
  54   pplayer_input->fire = UP;
  55   pplayer_input->left = UP;
  56   pplayer_input->old_fire = UP;
  57   pplayer_input->right = UP;
  58   pplayer_input->up = UP;
  59   pplayer_input->old_up = UP;
  60 }
  61
  62 void
  63 Player::init()
  64 {
  65   Level* plevel = World::current()->get_level();
  66
  67   holding_something = false;
  68
  69   base.width = 32;
  70   base.height = 32;
  71
  72   size = SMALL;
  73   got_coffee = false;
  74
  75   base.x = plevel->start_pos_x;
  76   base.y = plevel->start_pos_y;
  77   base.xm = 0;
  78   base.ym = 0;
  79   previous_base = old_base = base;
  80   dir = RIGHT;
  81   old_dir = dir;
  82   duck = false;
  83
  84   dying   = DYING_NOT;
  85   jumping = false;
  86   can_jump = true;
  87
  88   frame_main = 0;
  89   frame_ = 0;
  90
  91   player_input_init(&input);
  92
  93   invincible_timer.init(true);
  94   skidding_timer.init(true);
  95   safe_timer.init(true);
  96   frame_timer.init(true);
  97   kick_timer.init(true);
  98
  99   physic.reset();
 100 }
 101
 102 int
 103 Player::key_event(SDLKey key, int state)
 104 {
 105   if(key == keymap.right)
 106     {
 107       input.right = state;
 108       return true;
 109     }
 110   else if(key == keymap.left)
 111     {
 112       input.left = state;
 113       return true;
 114     }
 115   else if(key == keymap.jump)
 116     {
 117       input.up = state;
 118       return true;
 119     }
 120   else if(key == keymap.duck)
 121     {
 122       input.down = state;
 123       return true;
 124     }
 125   else if(key == keymap.fire)
 126     {
 127       if (state == UP)
 128         input.old_fire = UP;
 129       input.fire = state;
 130       return true;
 131     }
 132   else
 133     return false;
 134 }
 135
 136 void
 137 Player::level_begin()
 138 {
 139   base.x  = 100;
 140   base.y  = 170;
 141   base.xm = 0;
 142   base.ym = 0;
 143   previous_base = old_base = base;
 144   duck = false;
 145
 146   dying = DYING_NOT;
 147
 148   player_input_init(&input);
 149
 150   invincible_timer.init(true);
 151   skidding_timer.init(true);
 152   safe_timer.init(true);
 153   frame_timer.init(true);
 154
 155   physic.reset();
 156 }
 157
 158 void
 159 Player::action(double frame_ratio)
 160 {
 161   bool jumped_in_solid = false;
 162
 163   if (input.fire == UP)
 164     holding_something = false;
 165
 166   /* Move tux: */
 167   previous_base = base;
 168
 169   /* --- HANDLE TUX! --- */
 170   if(dying == DYING_NOT)
 171     handle_input();
 172
 173   physic.apply(frame_ratio, base.x, base.y);
 174
 175   if(dying == DYING_NOT)
 176     {
 177       base_type target = base;
 178
 179       collision_swept_object_map(&old_base, &base);
 180
 181       // Don't accelerate Tux if he is running against a wall
 182       if (target.x != base.x)
 183         {
 184           physic.set_velocity_x(0);
 185         }
 186
 187       // special exception for cases where we're stuck under tiles after
 188       // being ducked. In this case we drift out
 189       if(!duck && on_ground() && old_base.x == base.x && old_base.y == base.y
 190          && collision_object_map(base))
 191         {
 192           base.x += frame_ratio * WALK_SPEED * (dir ? 1 : -1);
 193           previous_base = old_base = base;
 194         }
 195       check_bounds();
 196
 197       // Land:
 198       if (!on_ground())
 199         {
 200           physic.enable_gravity(true);
 201           if(under_solid())
 202             {
 203               // fall down
 204               physic.set_velocity_y(0);
 205               jumped_in_solid = true;
 206             }
 207         }
 208       else
 209         {
 210           /* Land: */
 211           if (physic.get_velocity_y() < 0)
 212             {
 213               base.y = (int)(((int)base.y / 32) * 32);
 214               physic.set_velocity_y(0);
 215             }
 216
 217           physic.enable_gravity(false);
 218           /* Reset score multiplier (for multi-hits): */
 219           player_status.score_multiplier = 1;
 220         }
 221
 222       if(jumped_in_solid)
 223         {
 224           if (isbrick(base.x, base.y) ||
 225               isfullbox(base.x, base.y))
 226             {
 227               World::current()->trygrabdistro(base.x, base.y - 32,BOUNCE);
 228               World::current()->trybumpbadguy(base.x, base.y - 64);
 229
 230               World::current()->trybreakbrick(base.x, base.y, size == SMALL);
 231
 232               bumpbrick(base.x, base.y);
 233               World::current()->tryemptybox(base.x, base.y, RIGHT);
 234             }
 235
 236           if (isbrick(base.x+ 31, base.y) ||
 237               isfullbox(base.x+ 31, base.y))
 238             {
 239               World::current()->trygrabdistro(base.x+ 31, base.y - 32,BOUNCE);
 240               World::current()->trybumpbadguy(base.x+ 31, base.y - 64);
 241
 242               if(size == BIG)
 243                 World::current()->trybreakbrick(base.x+ 31, base.y, size == SMALL);
 244
 245               bumpbrick(base.x+ 31, base.y);
 246               World::current()->tryemptybox(base.x+ 31, base.y, LEFT);
 247             }
 248         }
 249
 250       grabdistros();
 251
 252       if (jumped_in_solid)
 253         {
 254           ++base.y;
 255           ++old_base.y;
 256           if(on_ground())
 257             {
 258               /* Make sure jumping is off. */
 259               jumping = false;
 260             }
 261         }
 262     }
 263
 264   /* ---- DONE HANDLING TUX! --- */
 265
 266   // check some timers
 267   skidding_timer.check();
 268   invincible_timer.check();
 269   safe_timer.check();
 270   kick_timer.check();
 271 }
 272
 273 bool
 274 Player::on_ground()
 275 {
 276   return ( issolid(base.x + base.width / 2, base.y + base.height) ||
 277            issolid(base.x + 1, base.y + base.height) ||
 278            issolid(base.x + base.width - 1, base.y + base.height)  );
 279 }
 280
 281 bool
 282 Player::under_solid()
 283 {
 284   return ( issolid(base.x + base.width / 2, base.y) ||
 285            issolid(base.x + 1, base.y) ||
 286            issolid(base.x + base.width - 1, base.y)  );
 287 }
 288
 289 void
 290 Player::handle_horizontal_input()
 291 {
 292   float vx = physic.get_velocity_x();
 293   float vy = physic.get_velocity_y();
 294   float ax = physic.get_acceleration_x();
 295   float ay = physic.get_acceleration_y();
 296
 297   float dirsign = 0;
 298   if(input.left == DOWN && input.right == UP && (!duck || physic.get_velocity_y() != 0)) {
 299       old_dir = dir;
 300       dir = LEFT;
 301       dirsign = -1;
 302   } else if(input.left == UP && input.right == DOWN && (!duck || physic.get_velocity_y() != 0)) {
 303       old_dir = dir;
 304       dir = RIGHT;
 305       dirsign = 1;
 306   }
 307
 308   if (input.fire == UP) {
 309       ax = dirsign * WALK_ACCELERATION_X;
 310       // limit speed
 311       if(vx >= MAX_WALK_XM && dirsign > 0) {
 312         vx = MAX_WALK_XM;
 313         ax = 0;
 314       } else if(vx <= -MAX_WALK_XM && dirsign < 0) {
 315         vx = -MAX_WALK_XM;
 316         ax = 0;
 317       }
 318   } else {
 319       ax = dirsign * RUN_ACCELERATION_X;
 320       // limit speed
 321       if(vx >= MAX_RUN_XM && dirsign > 0) {
 322         vx = MAX_RUN_XM;
 323         ax = 0;
 324       } else if(vx <= -MAX_RUN_XM && dirsign < 0) {
 325         vx = -MAX_RUN_XM;
 326         ax = 0;
 327       }
 328   }
 329
 330   // we can reach WALK_SPEED without any acceleration
 331   if(dirsign != 0 && fabs(vx) < WALK_SPEED) {
 332     vx = dirsign * WALK_SPEED;
 333   }
 334
 335   // changing directions?
 336   if(on_ground() && ((vx < 0 && dirsign >0) || (vx>0 && dirsign<0))) {
 337       if(fabs(vx)>SKID_XM && !skidding_timer.check()) {
 338           skidding_timer.start(SKID_TIME);
 339           play_sound(sounds[SND_SKID], SOUND_CENTER_SPEAKER);
 340           ax *= 2.5;
 341       } else {
 342           ax *= 2;
 343       }
 344   }
 345
 346   // we get slower when not pressing any keys
 347   if(dirsign == 0) {
 348       if(fabs(vx) < WALK_SPEED) {
 349           vx = 0;
 350           ax = 0;
 351       } else if(vx < 0) {
 352           ax = WALK_ACCELERATION_X * 1.5;
 353       } else {
 354           ax = WALK_ACCELERATION_X * -1.5;
 355       }
 356   }
 357
 358   // if we're on ice slow down acceleration or deceleration
 359   if (isice(base.x, base.y + base.height))
 360   {
 361     /* the acceleration/deceleration rate on ice is inversely proportional to
 362      * the current velocity.
 363      */
 364
 365     // increasing 1 will increase acceleration/deceleration rate
 366     // decreasing 1 will decrease acceleration/deceleration rate
 367     //  must stay above zero, though
 368     if (ax != 0) ax *= 1 / fabs(vx);
 369   }
 370
 371   physic.set_velocity(vx, vy);
 372   physic.set_acceleration(ax, ay);
 373 }
 374
 375 void
 376 Player::handle_vertical_input()
 377 {
 378   // Press jump key
 379   if(input.up == DOWN && can_jump)
 380     {
 381       if (on_ground())
 382         {
 383           // jump higher if we are running
 384           if (fabs(physic.get_velocity_x()) > MAX_WALK_XM)
 385             physic.set_velocity_y(5.8);
 386           else
 387             physic.set_velocity_y(5.2);
 388
 389           --base.y;
 390           jumping = true;
 391           can_jump = false;
 392           if (size == SMALL)
 393             play_sound(sounds[SND_JUMP], SOUND_CENTER_SPEAKER);
 394           else
 395             play_sound(sounds[SND_BIGJUMP], SOUND_CENTER_SPEAKER);
 396         }
 397     }
 398   // Let go of jump key
 399   else if(input.up == UP && jumping)
 400     {
 401       jumping = false;
 402       if(physic.get_velocity_y() > 0) {
 403         physic.set_velocity_y(0);
 404       }
 405     }
 406
 407   if ( (issolid(base.x + base.width / 2, base.y + base.height + 64) ||
 408         issolid(base.x + 1, base.y + base.height + 64) ||
 409         issolid(base.x + base.width - 1, base.y + base.height + 64))
 410        && jumping  == false
 411        && can_jump == false
 412        && input.up == DOWN
 413        && input.old_up == UP)
 414     {
 415       can_jump = true;
 416     }
 417
 418   input.old_up = input.up;
 419 }
 420
 421 void
 422 Player::handle_input()
 423 {
 424   /* Handle horizontal movement: */
 425     handle_horizontal_input();
 426
 427   /* Jump/jumping? */
 428
 429   if (on_ground() && input.up == UP)
 430     can_jump = true;
 431   if (input.up == DOWN || (input.up == UP && jumping))
 432     {
 433       handle_vertical_input();
 434     }
 435
 436   /* Shoot! */
 437
 438   if (input.fire == DOWN && input.old_fire == UP && got_coffee)
 439     {
 440       World::current()->add_bullet(base.x, base.y, physic.get_velocity_x(), dir);
 441       input.old_fire = DOWN;
 442     }
 443
 444   /* tux animations: */
 445   if(!frame_timer.check())
 446     {
 447       frame_timer.start(25);
 448       if (input.right == UP && input.left == UP)
 449         {
 450           frame_main = 1;
 451           frame_ = 1;
 452         }
 453       else
 454         {
 455           if ((input.fire == DOWN && (global_frame_counter % 2) == 0) ||
 456               (global_frame_counter % 4) == 0)
 457             frame_main = (frame_main + 1) % 4;
 458
 459           frame_ = frame_main;
 460
 461           if (frame_ == 3)
 462             frame_ = 1;
 463         }
 464     }
 465
 466   /* Duck! */
 467   if (input.down == DOWN && size == BIG && !duck && physic.get_velocity_y() == 0 && on_ground())
 468     {
 469       duck = true;
 470       base.height = 32;
 471       base.y += 32;
 472       // changing base size confuses collision otherwise
 473       old_base = previous_base = base;
 474     }
 475   else if(input.down == UP && size == BIG && duck && physic.get_velocity_y() == 0 && on_ground())
 476     {
 477       duck = false;
 478       base.y -= 32;
 479       base.height = 64;
 480       // changing base size confuses collision otherwise
 481       old_base = previous_base = base;
 482     }
 483 }
 484
 485 void
 486 Player::grow()
 487 {
 488   if(size == BIG)
 489     return;
 490
 491   size = BIG;
 492   base.height = 64;
 493   base.y -= 32;
 494
 495   old_base = previous_base = base;
 496 }
 497
 498 void
 499 Player::grabdistros()
 500 {
 501   /* Grab distros: */
 502   if (!dying)
 503     {
 504       World::current()->trygrabdistro(base.x, base.y, NO_BOUNCE);
 505       World::current()->trygrabdistro(base.x+ 31, base.y, NO_BOUNCE);
 506
 507       World::current()->trygrabdistro(base.x, base.y + base.height, NO_BOUNCE);
 508       World::current()->trygrabdistro(base.x+ 31, base.y + base.height, NO_BOUNCE);
 509
 510       if(size == BIG)
 511         {
 512           World::current()->trygrabdistro(base.x, base.y + base.height / 2, NO_BOUNCE);
 513           World::current()->trygrabdistro(base.x+ 31, base.y + base.height / 2, NO_BOUNCE);
 514         }
 515
 516     }
 517
 518   /* Enough distros for a One-up? */
 519   if (player_status.distros >= DISTROS_LIFEUP)
 520     {
 521       player_status.distros = player_status.distros - DISTROS_LIFEUP;
 522       if(player_status.lives < MAX_LIVES)
 523         ++player_status.lives;
 524       /*We want to hear the sound even, if MAX_LIVES is reached*/
 525       play_sound(sounds[SND_LIFEUP], SOUND_CENTER_SPEAKER);
 526     }
 527 }
 528
 529 void
 530 Player::draw()
 531 {
 532   if (!safe_timer.started() || (global_frame_counter % 2) == 0)
 533     {
 534       if (dying == DYING_SQUISHED)
 535         {
 536           smalltux_gameover->draw(base.x - scroll_x, base.y);
 537         }
 538       else
 539         {
 540           PlayerSprite* sprite;
 541
 542           if (size == SMALL)
 543             sprite = &smalltux;
 544           else if (got_coffee)
 545             sprite = &firetux;
 546           else
 547             sprite = &largetux;
 548
 549           if (duck && size != SMALL)
 550             {
 551               if (dir == RIGHT)
 552                 sprite->duck_right->draw(base.x - scroll_x, base.y);
 553               else
 554                 sprite->duck_left->draw(base.x - scroll_x, base.y);
 555             }
 556           else if (skidding_timer.started())
 557             {
 558               if (dir == RIGHT)
 559                 sprite->skid_right->draw(base.x - scroll_x, base.y);
 560               else
 561                 sprite->skid_left->draw(base.x - scroll_x, base.y);
 562             }
 563           else if (kick_timer.started())
 564             {
 565               if (dir == RIGHT)
 566                 sprite->kick_right->draw(base.x - scroll_x, base.y);
 567               else
 568                 sprite->kick_left->draw(base.x - scroll_x, base.y);
 569             }
 570           else if (physic.get_velocity_y() != 0)
 571             {
 572               if (dir == RIGHT)
 573                 sprite->jump_right->draw(base.x - scroll_x, base.y);
 574               else
 575                 sprite->jump_left->draw(base.x - scroll_x, base.y);
 576             }
 577           else
 578             {
 579               if (fabsf(physic.get_velocity_x()) < 1.0f) // standing
 580                 {
 581                   if (dir == RIGHT)
 582                     sprite->stand_right->draw( base.x - scroll_x, base.y);
 583                   else
 584                     sprite->stand_left->draw( base.x - scroll_x, base.y);
 585                 }
 586               else // moving
 587                 {
 588                   if (dir == RIGHT)
 589                     sprite->walk_right->draw(base.x - scroll_x, base.y);
 590                   else
 591                     sprite->walk_left->draw(base.x - scroll_x, base.y);
 592                 }
 593             }
 594
 595           // Draw arm overlay graphics when Tux is holding something
 596           if (holding_something && physic.get_velocity_y() == 0)
 597             {
 598               if (dir == RIGHT)
 599                 sprite->grab_right->draw(base.x - scroll_x, base.y);
 600               else
 601                 sprite->grab_left->draw(base.x - scroll_x, base.y);
 602             }
 603
 604           // Draw blinking star overlay
 605           if (invincible_timer.started() &&
 606              (invincible_timer.get_left() > TUX_INVINCIBLE_TIME_WARNING || global_frame_counter % 3))
 607             {
 608               if (size == SMALL || duck)
 609                 smalltux_star->draw(base.x - scroll_x, base.y);
 610               else
 611                 largetux_star->draw(base.x - scroll_x, base.y);
 612             }
 613         }
 614     }
 615
 616   if (debug_mode)
 617     fillrect(base.x - scroll_x, base.y,
 618              base.width, base.height, 75,75,75, 150);
 619 }
 620
 621 void
 622 Player::collision(void* p_c_object, int c_object)
 623 {
 624   BadGuy* pbad_c = NULL;
 625
 626   switch (c_object)
 627     {
 628     case CO_BADGUY:
 629       pbad_c = (BadGuy*) p_c_object;
 630
 631      /* Hurt player if he touches a badguy */
 632       if (!pbad_c->dying && !dying &&
 633           !safe_timer.started() &&
 634           pbad_c->mode != BadGuy::HELD)
 635         {
 636           if (pbad_c->mode == BadGuy::FLAT && input.fire == DOWN
 637                && !holding_something)
 638             {
 639               holding_something = true;
 640               pbad_c->mode = BadGuy::HELD;
 641               pbad_c->base.y-=8;
 642             }
 643           else if (pbad_c->mode == BadGuy::FLAT)
 644             {
 645               // Don't get hurt if we're kicking a flat badguy!
 646             }
 647           else if (pbad_c->mode == BadGuy::KICK)
 648             {
 649               /* Hurt if you get hit by kicked laptop: */
 650               if (!invincible_timer.started())
 651                 {
 652                   kill(SHRINK);
 653                 }
 654               else
 655                 {
 656                    pbad_c->dying = DYING_FALLING;
 657                    play_sound(sounds[SND_FALL], SOUND_CENTER_SPEAKER);
 658                    World::current()->add_score(pbad_c->base.x - scroll_x,
 659                                                pbad_c->base.y,
 660                                                25 * player_status.score_multiplier);
 661                 }
 662             }
 663           else
 664             {
 665               if (!invincible_timer.started())
 666                 {
 667                   kill(SHRINK);
 668                 }
 669               else
 670                 {
 671                   pbad_c->kill_me(25);
 672                 }
 673             }
 674           player_status.score_multiplier++;
 675         }
 676       break;
 677     default:
 678       break;
 679     }
 680
 681 }
 682
 683 /* Kill Player! */
 684
 685 void
 686 Player::kill(HurtMode mode)
 687 {
 688   play_sound(sounds[SND_HURT], SOUND_CENTER_SPEAKER);
 689
 690   physic.set_velocity_x(0);
 691
 692   if (mode == SHRINK && size == BIG)
 693     {
 694       if (got_coffee)
 695         {
 696           got_coffee = false;
 697         }
 698       else
 699         {
 700           size = SMALL;
 701           base.height = 32;
 702           duck = false;
 703         }
 704       safe_timer.start(TUX_SAFE_TIME);
 705     }
 706   else
 707     {
 708       physic.enable_gravity(true);
 709       physic.set_acceleration(0, 0);
 710       physic.set_velocity(0, 7);
 711       dying = DYING_SQUISHED;
 712     }
 713 }
 714
 715 void
 716 Player::is_dying()
 717 {
 718   remove_powerups();
 719   dying = DYING_NOT;
 720 }
 721
 722 bool Player::is_dead()
 723 {
 724   if(base.y > screen->h)
 725     return true;
 726   else
 727     return false;
 728 }
 729
 730 /* Remove Tux's power ups */
 731 void
 732 Player::remove_powerups()
 733 {
 734   got_coffee = false;
 735   size = SMALL;
 736   base.height = 32;
 737 }
 738
 739 void
 740 Player::check_bounds()
 741 {
 742   /* Keep tux in bounds: */
 743   if (base.x < 0)
 744     { // Lock Tux to the size of the level, so that he doesn't fall of
 745       // on the left side
 746       base.x = 0;
 747     }
 748
 749   /* Keep in-bounds, vertically: */
 750   if (base.y > screen->h)
 751     {
 752       kill(KILL);
 753     }
 754
 755   if(base.x < scroll_x)  // can happen if back scrolling is disabled
 756     base.x = scroll_x;
 757 }
 758
 759 // EOF //
 760