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POJava Methods to rotate, increase size, and clear Box image in Java
 

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  1. POJava Methods to rotate, increase size, and clear Box image in Java
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    <p>I'm creating a java program to draw an image of a box. I have most of my code finished. But, I'm having trouble figuring out a method to rotate the box by a specific number of degrees. I'm also trying to create a method to increase the size of the box by percentage and to clear my canvas of all images drawn.</p> <p>This is the code I have thus far: // My Box class import java.awt.Rectangle;</p> <pre><code>public class Box { public Box(Shapes canvasRef, int leftSide, int topLeft, int theWidth, int theHeight) { left = leftSide; top= topLeft; width = theWidth; height = theHeight; canvas = canvasRef; theBox = new Rectangle(left, top, width, height); canvas.addToDisplayList(this); show = false; } public void draw() { show = true; theBox = new Rectangle(left, top, width, height); canvas.boxDraw(); } public void unDraw() { show = false; theBox = new Rectangle(left, top, width, height); canvas.boxDraw(); } public Rectangle getBox() { return theBox; } public void moveTo(int newX, int newY) { left = newX; top = newY; draw(); } // This is the method that I tried but doesn't do anything public void turn(int degrees) { int newAngle = angle + degrees; angle = newAngle % 60; } clearWorld() { // Clears the "canvas" upon which boxes are drawn } public void grow(int percentage) { //The box grows the specified percentage, about the center, i.e. increase each side of the box the percentage indicated, with the center unchanged } // My Driver Program import javax.swing.JFrame; public class DisplayList { public static void main(String[] args) { JFrame frame = new JFrame("Joe The Box"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(250, 250); Shapes component = new Shapes(); frame.add(component); frame.setVisible(true); Box b1 = new Box(component, 150, 100, 30, 50); Box b2 = new Box(component, 100, 100, 40, 60); b1.draw(); b2.draw(); b1.turn(90); b2.grow(100); b1.clearWorld(); Delay.sleep(2); b2.moveTo(10,10); } } public boolean showBox() { return show; } private int left; private int top; private int width; private int height; private int angle = 0; private Shapes canvas; private Rectangle theBox; private boolean show; } </code></pre> <p>Can anyone please help me with the last three methods of my Box class? I'm really struck on what to add? I'm open to any suggestions. Thanks for your time!</p>
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    1. USuser1676825
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    1. COWhy do you modulus the angle? `angle = newAngle % 60;`
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      1. USCraig Otis
    2. CO@CraigOtis Most likely that is a typo and should be `angle = newAngle % 360;`
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    3. CO@Code-Guru Ah, good point. I think you're right.
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