IFD:PhysicalComp2011: Difference between revisions

IFD:PhysicalComp2011 (view source)

Revision as of 12:38, 25 October 2011

1,438 bytes added , 25 October 2011

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→‎24.10.2011 Processing sketches

Frederic Gmeiner

213

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 </source>
+<br /><br />
 === III Functions ===
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 </source>
+<br /><br />
+=== IV Movement & conditions ===
+<source lang="java">
+/* MOVEMENT & CONDITIONS
+ *
+ * By changing a variable during the runtime,
+ * we can alter the condition of the program.
+ * Here we increment an integer variable
+ * each time draw() is called. This variable is
+ * used for the x-position of a line, thus
+ * creating the illusion of a continuous movement
+ * from left to right.
+ * Via the "if" and "else" branches we can react
+ * to different states of the program and alter it
+ * accordingly.
+ *
+ * Frederic Gmeiner 2011
+ */
+// variable to store the x-position of the line:
+int lineX = 0;
+void setup(){
+  size(500,300);
+}
+void draw(){
+  // clear the background
+  background(255);
+  // if the x position of the line is larger than the middle of the screen:
+  if(lineX > width/2){
+     // change the stroke colour to pure red:
+    stroke(255,0,0);
+  // if the x position of the line is smaller than the middle of the screen:
+  }else{
+    // set the stroke coulour to black:
+    stroke(0,0,0);
+  }
+  // draw a vertical line from the top (0) to the bottom ("height") at
+  // the current x-position:
+  line(lineX,0,lineX,height);
+  // increment the lineX variable by 1
+  // (you could also simply write "lineX++")
+  lineX = lineX+1;
+  // use the "println()" function to show the value of variables
+  // in the console. this is helpful for debugging.
+  println(lineX);
+}
+</source>
+<br /><br />
 [[Category:WS11]]