Game Controls - Android Games Practical Programming by Example - page 93

//Determines if two rectangles overlap, returns true if the
//overlapped area is larger than the given threshold.
//Parameters:
// x1 - x position of the left side of rectangle#1

// y1 - y position of the top side of rectangle#1

// w1 - the width of rectangle#1

// h1 - the height of rectangel#1

// x2 - x position of the left side of rectangle#2

// y2 - y position of the top side of rectangle#2

// w2 - the width of rectangle#2

// h2 - the height of rectangel#2

// overlap - the given threshold

public boolean isOverlapped(
int x1, int y1, int w1, int h1,
int x2, int y2, int w2, int h2,
float overlap){

int xb = 0; //big x
int yb = 0; //big y
int xs = 0; //small x
int ys = 0; //small y
int width = 0;
int height = 0;
boolean xFlag = true ;
boolean yFlag = true ;

if (x1 >= x2){
xb = x1;
xs = x2;
xFlag = false ;

}
else {

xb = x2;
xs = x1;
xFlag = true ;

}