Invader.cpp

00001 #include "Invader.h"
00002 #include <stdlib.h>     /* srand, rand */
00003 #include <time.h>       /* time */
00004 
00005 #define WIDTH 10
00006 #define HEIGHT 10
00007 
00008 Invader::Invader(uLCD_4DGL* startScreen, int w, int h) 
00009 {
00010     /* initialize random seed: */
00011     srand (time(NULL));
00012   
00013     windowWidth = w;
00014     windowHeight = h;
00015     screen = startScreen;
00016     resetLocationAndSpeed();
00017 }    
00018 
00019 void Invader::update() 
00020 {
00021     printf("x: %d, y: %d, spdY: %d\n\r", x,y, spdY);
00022     lastX = x;
00023     lastY = y;
00024     
00025     x += spdX;
00026     y += spdY;
00027     
00028     if (x <= -10 || y <= -10 || x+WIDTH >= windowWidth + 10 || y+HEIGHT >= windowHeight + 10) {
00029         // Then it is beyond the starting location for the box and we should reset it.
00030         resetLocationAndSpeed();
00031     }
00032 }
00033 
00034 void Invader::draw() 
00035 {
00036     screen_mutex.lock();
00037     screen->filled_rectangle(lastX-WIDTH/2-1, lastY-HEIGHT/2-1, lastX+3*WIDTH/2, lastY+3*HEIGHT/2, BLACK);
00038     screen->filled_rectangle(x, y, x+WIDTH, y+HEIGHT, RED);
00039     screen_mutex.unlock();
00040 }
00041 
00042 bool Invader::intersects(int otherX, int otherY, int otherWidth, int otherHeight) 
00043 {
00044     if (((otherX > x && otherX <= x + WIDTH) || (otherX + otherWidth > x && otherX + otherWidth <= x + WIDTH)) &&
00045         ((otherY > y && otherY <= y + HEIGHT) || (otherY + otherHeight > y && otherY + otherHeight <= y + HEIGHT))) {
00046             printf("Intersects\n");
00047             return true;
00048     }
00049     else {
00050         printf("Not Intersecting\n\n");
00051         return false;
00052     }
00053 }
00054 
00055 void Invader::resetLocationAndSpeed() 
00056 {
00057     int side = rand() % 4;
00058     switch(side) {
00059         case 0: // Left
00060             x = -9;
00061             y = (int)(rand() % (windowHeight - HEIGHT));
00062             spdX = (int)(rand() % 3 + 1);
00063             spdY = (int)(((int)rand())==0 ? -1 : 1)*(rand() % 3);
00064             break;
00065         case 1: // Right
00066             x = windowWidth - 1;
00067             y = (int)(rand() % (windowHeight - HEIGHT));
00068             spdX = (int) (-1*(rand() % 3 + 1));
00069             spdY = (int)(((int)rand())==0 ? -1 : 1)*(rand() % 3);
00070             break;
00071         case 2: // Top
00072             x = (int)(rand() % (windowWidth - WIDTH));
00073             y = -9;
00074             spdX = (int)(((int)rand())==0 ? -1 : 1)*(rand() % 3);
00075             spdY = (int)(rand() % 3 + 1);
00076             break;
00077         case 3: // Bottom
00078             x = (int)(rand() % (windowWidth - WIDTH));
00079             y = windowWidth-1;
00080             spdX = (int)(((int)rand())==0 ? -1 : 1)*(rand() % 3);
00081             spdY = (int)(-1*(rand() % 3 + 1));
00082             break;
00083     }
00084 }