Zhe Cheng Lee / SIgame

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Dependents:   PORGFINAL SpaceInvadersFINAL

SIgame.cpp@1:91edc119bf6d, 2013-03-07 (annotated)

Committer:
zlee9
Date:
Thu Mar 07 22:36:07 2013 +0000
Revision:
1:91edc119bf6d
Parent:
0:4564efa43302 
Fixed laser collision (lasers were previously bypassing enemy laser after touching them)

Who changed what in which revision?

UserRevisionLine numberNew contents of line
zlee9 0:4564efa43302 1 #include "SIgame.h"
zlee9 0:4564efa43302 2 #include "mbed.h"
zlee9 0:4564efa43302 3
zlee9 0:4564efa43302 4 /***************************************************************/
zlee9 0:4564efa43302 5 /* */
zlee9 0:4564efa43302 6 /* Game-Related Functions */
zlee9 0:4564efa43302 7 /* */
zlee9 0:4564efa43302 8 /***************************************************************/
zlee9 0:4564efa43302 9 OBJECT startShip()
zlee9 0:4564efa43302 10 {/******
zlee9 0:4564efa43302 11 * startShip
zlee9 0:4564efa43302 12 * Sets up structure for player's ship
zlee9 0:4564efa43302 13 ******/
zlee9 0:4564efa43302 14 OBJECT ship;
zlee9 0:4564efa43302 15
zlee9 0:4564efa43302 16 ship.height = SHIP_HEIGHT;
zlee9 0:4564efa43302 17 ship.width = SHIP_WIDTH;
zlee9 0:4564efa43302 18 ship.y = SCREENHEIGHT - ship.height + 1; // Starting location
zlee9 0:4564efa43302 19 ship.x = SCREENWIDTH >> 1;
zlee9 0:4564efa43302 20 ship.color = GREEN; // Player's ship is green
zlee9 0:4564efa43302 21 ship.killed = false;
zlee9 0:4564efa43302 22
zlee9 0:4564efa43302 23 return ship;
zlee9 0:4564efa43302 24 }
zlee9 0:4564efa43302 25
zlee9 0:4564efa43302 26 void summonWave()
zlee9 0:4564efa43302 27 {/******
zlee9 0:4564efa43302 28 * summonWave
zlee9 0:4564efa43302 29 * Initialize 2-D array containing columns of aliens and their starting
zlee9 0:4564efa43302 30 * indicies
zlee9 0:4564efa43302 31 ******/
zlee9 0:4564efa43302 32 int r, c, i, j;
zlee9 0:4564efa43302 33 j = 1;
zlee9 0:4564efa43302 34
zlee9 0:4564efa43302 35 for (c = 0; c < NUM_ALIEN_COLS; c++)
zlee9 0:4564efa43302 36 {
zlee9 0:4564efa43302 37 i = 0;
zlee9 0:4564efa43302 38 for (r = 0; r < NUM_ALIEN_ROWS; r++)
zlee9 0:4564efa43302 39 { // Within current column, initialize aliens' locations
zlee9 0:4564efa43302 40 wave[r][c].x = j;
zlee9 0:4564efa43302 41 wave[r][c].width = ALIEN_WIDTH;
zlee9 0:4564efa43302 42 wave[r][c].y = i;
zlee9 0:4564efa43302 43 wave[r][c].height = ALIEN_HEIGHT;
zlee9 0:4564efa43302 44 wave[r][c].color = WHITE; // Aliens are white
zlee9 0:4564efa43302 45 wave[r][c].killed = false;
zlee9 0:4564efa43302 46 i += (ALIEN_HEIGHT + 1);
zlee9 0:4564efa43302 47 }
zlee9 0:4564efa43302 48
zlee9 0:4564efa43302 49 j += (ALIEN_WIDTH + 3); // Ready gap for next column of aliens
zlee9 0:4564efa43302 50 }
zlee9 0:4564efa43302 51 }
zlee9 0:4564efa43302 52
zlee9 0:4564efa43302 53
zlee9 0:4564efa43302 54 void destroyAlien(int *pals_rem, POINT *pylaser, OBJECT *frontline[])
zlee9 0:4564efa43302 55 {/******
zlee9 0:4564efa43302 56 * destroyAlien
zlee9 0:4564efa43302 57 * Checks if ship's laser hits any alien and kill alien if so
zlee9 0:4564efa43302 58 ******/
zlee9 0:4564efa43302 59 bool hit = false;
zlee9 0:4564efa43302 60 int r, c = 0;
zlee9 0:4564efa43302 61
zlee9 0:4564efa43302 62 do
zlee9 0:4564efa43302 63 { // Go to column from wave of aliens of which laser may hit alien
zlee9 0:4564efa43302 64 if (pylaser->x >= wave[0][c].x && pylaser->x <= wave[0][c].x +
zlee9 0:4564efa43302 65 wave[0][c].width - 1)
zlee9 0:4564efa43302 66 {
zlee9 0:4564efa43302 67 r = 0;
zlee9 0:4564efa43302 68 do // Find alien in column that laser touches if possible
zlee9 0:4564efa43302 69 {
zlee9 0:4564efa43302 70 if (pylaser->y >= wave[r][c].y && pylaser->y <= wave[r][c].y +
zlee9 0:4564efa43302 71 wave[r][c].height && !(wave[r][c].killed) &&
zlee9 0:4564efa43302 72 !(pylaser->collide))
zlee9 0:4564efa43302 73 { // Alien is killed and not be drawn on screen
zlee9 0:4564efa43302 74 (*pals_rem)--;
zlee9 0:4564efa43302 75 wave[r][c].killed = pylaser->collide = hit = true;
zlee9 0:4564efa43302 76
zlee9 0:4564efa43302 77 // Adjust pointer to front alien of selected column if killed
zlee9 0:4564efa43302 78 // alien was one
zlee9 0:4564efa43302 79 if (frontline[c] == &wave[r][c])
zlee9 0:4564efa43302 80 {
zlee9 0:4564efa43302 81 if (!r) // All aliens on that are wiped out
zlee9 0:4564efa43302 82 frontline[c] = NULL;
zlee9 0:4564efa43302 83 else // Point to alien behind killed one
zlee9 0:4564efa43302 84 frontline[c] = &wave[r-1][c];
zlee9 0:4564efa43302 85 }
zlee9 0:4564efa43302 86 }
zlee9 0:4564efa43302 87 r++;
zlee9 0:4564efa43302 88 } while (!hit && r < NUM_ALIEN_ROWS);
zlee9 0:4564efa43302 89 }
zlee9 0:4564efa43302 90 c++;
zlee9 0:4564efa43302 91 } while (!hit && c < NUM_ALIEN_COLS);
zlee9 0:4564efa43302 92 }
zlee9 0:4564efa43302 93
zlee9 0:4564efa43302 94
zlee9 0:4564efa43302 95 bool twoLasersCollide(POINT *pylaser, POINT elaser[])
zlee9 0:4564efa43302 96 {/******
zlee9 0:4564efa43302 97 * twoLasersCollide
zlee9 0:4564efa43302 98 * Checks if player's laser touches any of alien's lasers and removes them if
zlee9 0:4564efa43302 99 * so
zlee9 0:4564efa43302 100 ******/
zlee9 0:4564efa43302 101 int i;
zlee9 0:4564efa43302 102
zlee9 0:4564efa43302 103 for (i = 0; i < ELASER_CAP; i++)
zlee9 0:4564efa43302 104 { // Find enemy laser in same location as player's laser if so
zlee9 1:91edc119bf6d 105 if (pylaser->x == elaser[i].x && pylaser->y <= elaser[i].y+2 &&
zlee9 0:4564efa43302 106 !(pylaser->collide || elaser[i].collide))
zlee9 0:4564efa43302 107 { // Both lasers cancel each other out and disappear on screen
zlee9 0:4564efa43302 108 pylaser->collide = elaser[i].collide = true;
zlee9 0:4564efa43302 109 return true;
zlee9 0:4564efa43302 110 }
zlee9 0:4564efa43302 111 }
zlee9 0:4564efa43302 112 return false;
zlee9 0:4564efa43302 113 }
zlee9 0:4564efa43302 114
zlee9 0:4564efa43302 115
zlee9 0:4564efa43302 116 bool moveAlienWave(bool *pleft)
zlee9 0:4564efa43302 117 {/******
zlee9 0:4564efa43302 118 * moveAlienWave
zlee9 0:4564efa43302 119 * Changes all aliens' locations to move wave of aliens
zlee9 0:4564efa43302 120 ******/
zlee9 0:4564efa43302 121 int r, c;
zlee9 0:4564efa43302 122 bool reach, old_dir;
zlee9 0:4564efa43302 123 reach = false;
zlee9 0:4564efa43302 124 old_dir = *pleft;
zlee9 0:4564efa43302 125
zlee9 0:4564efa43302 126 // Flip direction when wave reaches either side of screen
zlee9 0:4564efa43302 127 if (wave[NUM_ALIEN_ROWS-1][0].x <= 0 && *pleft)
zlee9 0:4564efa43302 128 *pleft = false;
zlee9 0:4564efa43302 129 else if (wave[NUM_ALIEN_ROWS-1][NUM_ALIEN_COLS-1].x + ALIEN_WIDTH >=
zlee9 0:4564efa43302 130 SCREENWIDTH && !(*pleft))
zlee9 0:4564efa43302 131 *pleft = true;
zlee9 0:4564efa43302 132
zlee9 0:4564efa43302 133 // Change all aliens' locations in array
zlee9 0:4564efa43302 134 for (c = 0; c < NUM_ALIEN_COLS; c++)
zlee9 0:4564efa43302 135 {
zlee9 0:4564efa43302 136 for (r = 0; r < NUM_ALIEN_ROWS; r++)
zlee9 0:4564efa43302 137 {
zlee9 0:4564efa43302 138 if (old_dir ^ *pleft) // Moves downward if end columns touch borders
zlee9 0:4564efa43302 139 wave[r][c].y += ALIEN_HEIGHT;
zlee9 0:4564efa43302 140 // If not moving down, then moves horizontally
zlee9 0:4564efa43302 141 if (*pleft)
zlee9 0:4564efa43302 142 (wave[r][c].x)--;
zlee9 0:4564efa43302 143 else
zlee9 0:4564efa43302 144 (wave[r][c].x)++;
zlee9 0:4564efa43302 145
zlee9 0:4564efa43302 146 // Player loses if any alien reaches screen border at player's side
zlee9 1:91edc119bf6d 147 if (wave[r][c].y > SCREENHEIGHT - (wave[r][c].height << 1) + 1
zlee9 1:91edc119bf6d 148 && !(wave[r][c].killed))
zlee9 0:4564efa43302 149 reach = true;
zlee9 0:4564efa43302 150 }
zlee9 0:4564efa43302 151 }
zlee9 0:4564efa43302 152 return reach;
zlee9 0:4564efa43302 153 }