ball.cpp

00001 #include "mbed.h"
00002 #include "ball.h"
00003 
00004 Ball::Ball() {
00005   int x=y=width=height=color=xInc=yInc=0;
00006 }
00007 
00008 Ball::Ball(int x, int y, int w, int h, int c, int xi, int yi)
00009  : x(x), y(y), width(w), height(h), color(c), xInc(xi), yInc(yi) {}
00010  
00011  
00012 /* 
00013  * Member Function move:
00014  * Description: Colors in the previous ball black
00015  *  and moves ball to new position.
00016  */
00017 void Ball::move(NokiaLCD &lcd) {
00018   draw(lcd, true);
00019   x += xInc; y += yInc;
00020 }
00021 
00022 /* 
00023  * Member Function draw:
00024  * Description: Draws object on screen
00025  *  if isBlack, color in black.
00026  */
00027 void Ball::draw(NokiaLCD &lcd, bool isBlack) const {
00028   lcd.fill(x, y, width, height, (isBlack) ? 0x000000 : color);
00029 }
00030 
00031 int Ball::size() const {
00032   return width*height;
00033 }
00034 
00035 int Ball::getX() const {
00036   return x;
00037 }
00038 
00039 int Ball::getY() const {
00040   return y;
00041 }
00042 
00043 bool Ball::hitX() {
00044   return (x+width<=width) || (x+width>=132);
00045 }
00046 
00047 bool Ball::hitY() {
00048   return (y<=0) || (y+height>=130);
00049 }
00050 
00051 /* 
00052  * Member Function hitP1:
00053  * Description: Checks to see if there is
00054  *  a collision between paddle1 and the ball.
00055  *  Has special functionality for changing
00056  *  y-incline based on collision point.
00057  */
00058 bool Ball::hitP1(int _x, int _y, int _height) {
00059   bool hit = ((_x>=x) && (xInc<0)) && 
00060          (((_y<=y) && (_y+_height>=y+height)) ||
00061           ((_y>=y) && (_y<=y+height)) ||
00062           ((_y+_height>=y) && (_y+_height<=y+height))
00063          );
00064   if(hit) {
00065     if(_y+_height-y < 4 && yInc>0) yInc = 2;
00066     if(y-_y < 4 && yInc<0) yInc = -2;
00067     else yInc = (yInc>0) ? 1 : -1;
00068   }
00069   return hit;
00070 }
00071 
00072 
00073 /* 
00074  * Member Function hitP2:
00075  * Description: Checks to see if there is
00076  *  a collision between paddle2 and the ball.
00077  *  Has special functionality for changing
00078  *  y-incline based on collision point.
00079  */
00080 bool Ball::hitP2(int _x, int _y, int _height) {
00081   bool hit = ((_x<=x+width) && (xInc>0)) && 
00082          (((_y<=y) && (_y+_height>=y+height)) ||
00083           ((_y>=y) && (_y<=y+height)) ||
00084           ((_y+_height>=y) && (_y+_height<=y+height))
00085          );
00086   if(hit) {
00087     if(_y+_height-y < 4 && yInc>0) yInc = 2;
00088     if(y-_y < 4 && yInc<0) yInc = -2;
00089     else yInc = (yInc>0) ? 1 : -1;
00090   }
00091   return hit;
00092 }
00093 
00094 void Ball::reverseX() {
00095   xInc *= -1;
00096 }
00097 
00098 void Ball::reverseY() {
00099   yInc *= -1;
00100 }