Difference between revisions of "Animation"

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(Lots of squares - one is a different colour)
(Lots of squares - lots of colours)
Line 131: Line 131:
 
  width='150' height='100' className="Anim"
 
  width='150' height='100' className="Anim"
 
  classpath="classes.jar">
 
  classpath="classes.jar">
We draw 20 squares.
+
Much rainbow. So colour.
 
+
Each of them is yellow - except one.
+
 
   
 
   
 
<prog>
 
<prog>
<![CDATA[
+
<![CDATA[static void drawFrame(Graphics2D g, int frame){
static void drawFrame(Graphics2D g, int frame){
+
 
   g.setColor(Color.white);
 
   g.setColor(Color.white);
 
   g.fillRect(0,0,150,100);
 
   g.fillRect(0,0,150,100);
   Color [] roy = {Color.red, Color.orange, Color.yellow, Color.green, Color.blue, Color.indigo, Color.violet};
+
  g.translate(75,50);
   for(int i=0;i<20;i++){
+
   Color [] roy = {Color.red, Color.orange, Color.yellow, Color.green, Color.blue, Color.magenta};
     g.setColor(roy[(frame+i) % roy.length]);
+
   for(int i=0;i<24;i++){
     g.fillRect(100*i/20,0,100/20,100/20);
+
    g.rotate(Math.PI*2/24);
 +
     g.setColor(roy[((frame+i)/4) % roy.length]);
 +
     g.fillRect(40,0,100/20,100/20);
 
     g.setColor(Color.black);
 
     g.setColor(Color.black);
     g.drawRect(100*i/20,0,100/20,100/20);
+
     g.drawRect(40,0,100/20,100/20);
 
   }
 
   }
 
}
 
}
 
]]></prog>
 
]]></prog>
 
</question>
 
</question>

Revision as of 18:56, 6 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 draw 20 squares.

Each of them is yellow - except one.


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Lots of squares - lots of colours

Much rainbow. So colour.


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