# (Solved) : Question Add Shapefactory Isolate Creation New Shape Objects Example Shape C Shapefactoryn Q42706868 . . .

In this question, we add a ShapeFactory to isolate the creationof new Shape objects. For example:
Shape c = ShapeFactory.newShape(“circle”); creates acircle
Shape r = ShapeFactory.newShape(“rectangle”); creates arectangle
Shape t = ShapeFactory.newShape(“translate”); creates atranslate
Shape o = ShapeFactory.newShape(“complexShape”); creates acomplexShape
Write the newShape method in the ShapeFactory class. You can assumethat the string parameter
is one of “circle”, “rectangle”, “translate” or”complexshape”.
class ShapeFactory {
static Shape newShape(String shapeKind) {
}

Write correct implementations of the addShape and draw methodsin ComplexShape.
class ComplexShape implements Shape { // …
/** add a shape to the composite */
}
}
class ComplexShape implements Shape { // …
/** draw all shapes in the composite */
public void draw(Color c) {

Reference
Most of this exam concerns the construction of a simple 2-Dgraphics library, which uses the following
utility class.
class BasicGLib {
/** draw a circle of color c with center at current cursorposition
*/
public static void drawCircle(Color c, int radius) {/*…*/}
/** draw a rectangle of Color c
* with lower left corner at current cursor position
* the length of the rectangle along the x axis is given byxlength
* the length of the rectangle along the y axis is given byylength
*/
public static void drawRect(Color c, int xlength, int ylength){/*…*/}
/** move the cursor by coordinate (xcoord,ycoord) */
public static void moveCursor(int xcoord, int ycoord){/*…*/}
/** clear the entire screen and set cursor position to (0,0)*/
public static void clear() {/*…*/}
}
For example:
BasicGLib.clear(); // initialize
BasicGLib.drawCircle(Color.red, 3); // a red circle: radius 3,center (0,0)
BasicGLib.drawRect(Color.blue, 3, 5); // a blue rectangle:(0,0),(3,0),(3,5),(0,5)
BasicGLib.moveCursor(2, 2); // move cursor
BasicGLib.drawCircle(Color.green, 3); // a green circle: radius 3,center (2,2)
BasicGLib.drawRect(Color.pink, 3, 5); // a pink rectangle:(2,2),(5,2),(5,7),(2,7)
BasicGLib.moveCursor(-2, -2); // move cursor back to (0,0)
In this exam, you will write code to build and manipulate complexShape objects built out of circles and
rectangles. An outline of the code is given on the followingpage.
import java.awt.Color; import java.util.ArrayList;
interface Shape extends Cloneable {
public void draw(Color c);
public void accept(ShapeVisitor v);
public Object clone();
}
interface ShapeVisitor {
public void visitCircle(int r);
public void visitRectangle(int x, int y);
public void visitComplexShape(ArrayList shapes);
public void visitTranslate(int x, int y, Shape s);
}
class Circle implements Shape {
private int _r;
public void setRadius(int r) { _r = r; }
public int getRadius() { return _r; }
public void draw(Color c) { BasicGLib.drawCircle(c, _r); }
public Object clone() { return null; }
public boolean equals(Object o) { return false; }
public void accept(ShapeVisitor v) { v.visitCircle(_r); }
}
class Rectangle implements Shape {
private int _x, _y;
public void setXY(int x, int y) { _x = x; _y = y; }
public int getX() { return _x; }
public int getY() { return _y; }
public void draw(Color c) { BasicGLib.drawRect(c, _x, _y); }
public Object clone() { return null; }
public boolean equals(Object o) { return false; }
public void accept(ShapeVisitor v) { v.visitRectangle(_x,_y);}
}
class ComplexShape implements Shape {
private ArrayList _shapes = new ArrayList();
public void addShape(Shape s) { }
public void draw(Color c) { }
public Object clone() { return null; }
public boolean equals(Object o) { return false; }
public void accept(ShapeVisitor v) { v.visitComplexShape(_shapes);}
}
class Translate implements Shape{
private int _x, _y;
private Shape _s;
public void setXY(int x, int y) { _x = x; _y = y; }
public void setShape(Shape s) { _s = s; }
public int getX() { return _x; }
public int getY() { return _y; }
public Shape getShape() { return _s; }
public void draw(Color c) { }
public Object clone() { return null; }
public boolean equals(Object o) { return false; }
public void accept(ShapeVisitor v) { v.visitTranslate(_x,_y,_s);}
}
ArrayList is defined in part:
public class ArrayList { /*…*/
public ArrayList() {/*…/*}
public int size() {/*…/*}
public boolean isEmpty() {/*…/*}
public Object clone() {/*…/*}
public boolean equals(Object o) {/*…/*}
public Object get(int index) {/*…/*}
public void clear() {/*…/*}
}

Answer to In this question, we add a ShapeFactory to isolate the creation of new Shape objects. For example: Shape c = ShapeFactor…

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