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Definitions and declarations

The code containing the definitions and declarations sections is shown as follows:

typedef struct Bounds {  int width;  int height;} Bounds;// We're using the term "Rect" to represent the rectangle the// image occupies:typedef struct Rect {  int x;  int y;  int width;  int height;  // Horizontal direction of travel (L/R):  char horizDir;  // Vertical direction of travel (U/D):  char vertDir;} Rect;struct Bounds bounds;struct Rect rect;

New properties were added to the existing Rect definition to accommodate for flexible sizing and tracking movement in the x and y directions. We defined a new struct, Bounds, and removed the existing #define statements because the <canvas> element is no longer a square with static dimensions. ...