Shape class
/** * This is a class that represent any shape. This is the superclass of all shapes. * @author yklam2 * */ public class Shape { private boolean canvas[][]; private int width; private int height; /** * Create an empty shape. */ public Shape() { this(0, 0); } /** * Create a shape with a specific <code>width</code> and <code>height</code>. * @param width The <code>width</code> of this shape. * @param height The <code>height</code> of this shape. */ protected Shape(int width, int height) { this.width = width; this.height = height; canvas = new boolean[height][width]; } /** * Set a pixel * @param row The <code>row</code> of the pixel. * @param column The <code>column</code> of the pixel. */ protected void setPixel(int row, int column) { if(row >=0 && row < height && column >=0 && column < width) canvas[row][column] = true; } /** * Clear a pixel * @param row The <code>row</code> of the pixel. * @param column The <code>column</code> of the pixel. */ protected void clearPixel(int row, int column) { if(row >=0 && row < height && column >=0 && column < width) canvas[row][column] = false; } /** * Get the area of this shape. Area is the number of pixel set in this * @return The area. */ public int getArea() { int area = 0;

shape.

for(boolean [] row: canvas) for(boolean pixel: row) if(pixel) ++area; } return area;

/* (non-Javadoc) * @see java.lang.Object#toString() */ public String toString() { String drawing = ""; for(boolean [] row: canvas) { if(drawing.length() > 0) // Cross platform newline drawing = drawing + System.lineSeparator(); for(boolean pixel: row) { drawing = drawing + (pixel?"*":" "); } } return drawing;

}

/** * Union this shape with another shape. * @param s The shape to union with * @return A new shape after the operation */ public Shape union(Shape s) { // Create new shape Shape newShape = new Shape(Math.max(this.width, s.width), Math.max(this.height, s.height)); // Copy to new shape for(int row=0; row<this.height; ++row) { for(int col=0; col<this.width; ++col) { newShape.canvas[row][col] = this.canvas[row][col]; } } // Union with the other shape for(int row=0; row<s.height; ++row) { for(int col=0; col<s.width; ++col) { newShape.canvas[row][col] |= s.canvas[row][col]; } } return newShape; } /** * Intersect this shape with another shape. * @param s The shape to intersect with * @return A new shape after the operation */ public Shape intersect(Shape s) { // Create new shape

Shape newShape = new Shape(Math.min(this.width, s.width), Math.min(this.height, s.height)); // Copy to new shape for(int row=0; row<Math.min(this.height, newShape.height); ++row) { for(int col=0; col<Math.min(this.width, newShape.width); ++col) { newShape.canvas[row][col] = this.canvas[row][col]; } } int lastRow = -1; int lastCol = -1; // Intersect with the other shape for(int row=0; row<Math.min(s.height, newShape.height); ++row) { for(int col=0; col<Math.min(s.width, newShape.width); ++col) { newShape.canvas[row][col] &= s.canvas[row][col]; if(newShape.canvas[row][col]) { if(lastRow < row) lastRow = row; if(lastCol < col) lastCol = col; } } } // Set the correct width and height this.width = lastCol+1; this.height = lastRow+1; return newShape;

}

}

Rectangle
/** * This is a class that represents a rectangle. * @author yklam2 * */public class Rectangle extends Shape { /** * Create an object that represents a rectangle with a specific <code>width</code> and <code>height</code>. * @param width The <code>width</code> of the rectangle. * @param height The <code>height</code> of the rectangle. */ public Rectangle(int width, int height) { super(width, height); for(int row=0; row<height; ++row) { for(int col=0; col<width; ++col) { setPixel(row, col); }

}

}

}

Diamond

/** * This is a class that represents a diamond shape. * @author yklam2 * */ public class Diamond extends Shape { /** * Create an object that represents a diamond with a specific <code>size</code>. * @param size The <code>size</code> of the diamond. */ public Diamond(int size) { super(2*size-1, 2*size-1); for(int row=0; row<2*size-1; ++row) { int offset = Math.abs(size-1-row); for(int col=0; col<2*(size-offset)-1; ++col) { setPixel(row, col+offset); } } } } Square /** * This is a class that represents a square. * @author yklam2 * */ public class Square extends Rectangle { /** * Create an object that represents a square with a specific <code>size</code>. * @param size The <code>size</code> of the square. */ public Square(int size) { super(size, size); } }