Difference between revisions of "Animation"

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(Rotating Star)
(Arrange Shapes in a Circle)
Line 101: Line 101:
 
</question>
 
</question>
  
==Arrange Shapes in a Circle==
+
==Lots of squares - one is a different colour==
 
<question copyFile="classes.jar" imgOut='anim.gif'
 
<question copyFile="classes.jar" imgOut='anim.gif'
 
  width='150' height='100' className="Anim"
 
  width='150' height='100' className="Anim"
 
  classpath="classes.jar">
 
  classpath="classes.jar">
We will print 20 stars.
+
We will print 20 squares.
  
 
Each of them will be yellow - except one.
 
Each of them will be yellow - except one.
 
   
 
   
 
<prog>
 
<prog>
 +
<![CDATA[
 
static void drawFrame(Graphics2D g, int frame){
 
static void drawFrame(Graphics2D g, int frame){
 
   int r = 20;
 
   int r = 20;
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   }
 
   }
 
}
 
}
</prog>
+
]]></prog>
 
</question>
 
</question>

Revision as of 13:05, 1 December 2015

The animations here rely on Gif89Encoder available from http://jmge.net/java/gifenc/ developed by JMG Elliot.

Moving block

You can click on "Show" to see the full program.

The method drawFrame is called 20 times; frame is a different value each time, the graphics object is new each time. Draws a yellow rectangle at coordinates (50,8*frame-20) which is (50,-20), (50,-12), (50,-2), (50,6) ... (50,172) So the yellow box appears at the top of the image and moves down a little with each frame.


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Shooting Star

In this example both the x and the y coordinates change at each frame and so the star moves diagonally.


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Rotating Star


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Lots of squares - one is a different colour

We will print 20 squares.

Each of them will be yellow - except one.


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