1.3-Object-Georienteerd-Programmeren
Drawing shapes
This exercise requires the SaxionApp library. Please download this library using the link provided at relevant links.
Write a program that allows you to draw a rectangle, circle and square at any position and in any colour. To do this, write a super class Shape and its subclasses Rectangle, Circle and Square.
With all Shape instances you should be able to do the following:
- When creating a Shape, you must be able to give a position (x, y coordinates) and a colour in which the figure must be drawn.
- It must be possible to calculate the surface of the shape (method: getArea(), gives a double).
- It must be possible to calculate the circumference of the shape (method: getCircumference(), gives a double).
- It must be possible to actually draw the figure using the SaxionApp, by calling the draw() method. This method also ensures that the colour is set correctly and that any border is disabled.
To make life easier, feel free to use our run()-method:
public void run() {
SaxionApp.turnBorderOff();
Rectangle[] rectangles = {
// Rectangle(x, y, width, height, color)
new Rectangle(50, 50, 200, 100, Color.RED),
new Rectangle(50, 250, 300, 150, Color.GREEN),
new Rectangle(50, 450, 400, 50, Color.YELLOW)
};
Circle[] circles = {
// Circle(x, y, radius, color)
new Circle(100, 100, 50, Color.RED),
new Circle(100, 300, 75, Color.GREEN),
new Circle(100, 600, 100, Color.YELLOW)
};
Square[] squares = {
// Square(x, y, size, color)
new Square(50, 50, 50, Color.RED),
new Square(50, 250, 250, Color.GREEN),
new Square(50, 600, 100, Color.YELLOW)
};
// Print all rectangles
for(Rectangle rectangle : rectangles) {
rectangle.draw();
int textX = 700;
int textY = rectangle.getY();
SaxionApp.drawBorderedText("Circumference: "+ rectangle.getCircumference() + " (pixels)", textX, textY, 20);
SaxionApp.drawBorderedText("Area: "+ rectangle.getArea() + " (pixels)", textX, textY + 20, 20);
}
SaxionApp.pause();
SaxionApp.clear();
// Print all circles
for(Circle circle : circles) {
circle.draw();
int textX = 300;
int textY = circle.getY() - (int) (0.5 * circle.getRadius());
SaxionApp.drawBorderedText("Circumference: "+ circle.getCircumference() + " (pixels)", textX, textY, 20);
SaxionApp.drawBorderedText("Area: "+ circle.getArea() + " (pixels)", textX, textY + 20, 20);
}
SaxionApp.pause();
SaxionApp.clear();
// Print all squares
for(Square square : squares) {
square.draw();
int textX = 500;
int textY = square.getY();
SaxionApp.drawBorderedText("Circumference: "+ square.getCircumference() + " (pixels)", textX, textY, 20);
SaxionApp.drawBorderedText("Area: "+ square.getArea() + " (pixels)", textX, textY + 20, 20);
}
}
Examples
