League-Level2.github.io/InvadersRocketDraw.html at master · League-level2/League-Level2.github.io · GitHub

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<title>League Invaders - Game Objects</title>
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<h1>Rocket (draw)</h1>

<br>
<p class="normal">
All of the game characters share common characteristics. They all have to be drawn at a specific location (x,y) and have a specific size (width,height). The common characteristics will be stored in a "superclass" called GameObject.</p>

                    <h2>GameObject</h2>

<p class="normal">
    1. Create a new class called GameObject and add the following member variables to represent the information shared by all game characters:</p>

<pre>
 int x;
 int y;
 int width;
 int height;</pre>

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<p class="normal">
    2. Make a constructor for this class that takes parameters to initialize all of the above member variables.</p>
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<p class="normal">
    3. Add another int member variable called <code>speed</code> and initialize it to 0 and a boolean member variable called <code>isActive</code> and initialize it to true. These will be used later.</p>
                    <h2>Rocketship</h2>

<p class="normal">
4. Create a Rocketship class that extends the GameObject class.</p>
<pre>
public class Rocketship extends GameObject { }</pre>

<br>
<p class="normal">
5. Add a constructor for this class that takes the same parameters as the inherited GameObject constructor (see step 2), and pass the parameters to the GameObject (superclass) constructor (see below). Note: Eclipse can generate this for you</p>
<pre>
super(x,y,width,height);
</pre>
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<p class="normal">
    6. In the <code>Rocketship</code> class, create a void <code>draw()</code> method. The draw method takes a parameter that is a <code>Graphics</code> object (g). For now we will draw a blue square to represent the rocketship but putting the following code in its <code>draw()</code> method:</p>
 <pre>
        g.setColor(Color.BLUE);
        g.fillRect(x, y, width, height);</pre>
<br>
<h2>GamePanel</h2>
<br>
<p class="normal">
7. In the <code>GamePanel</code>, create a new member variable to hold a Rocketship object that has x,y of 250,700 and width/height of 50,50.</p>

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<p class="normal">
   8. In the drawGameState() method, add code to call the rocketship's draw method (pass it the Graphics object).</p>
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     <img src="images/InvadersBlueSquare.png" style="width: 150px; height=241px; margin: 0px 20px" align="left"> <h3><u>TESTING</u></h3><p class="normal"> 9. Run the program. Press the Enter key to put the game into the GAME state (black background). Does the blue rocketship (square) appear at the bottom?

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