IFD:PhysicalComp2011/code: Difference between revisions

IFD:PhysicalComp2011/code (view source)

889 bytes added , 13 December 2011

XI Interval Timer

213

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 }
+</source>
+<br /> <br />
+=== XI Interval Timer===
+<source lang="java">
+/* INTERVAL TIMER (PROCESSING)
+ *
+ * Often when animating things, we need
+ * to trigger events in a certain interval.
+ * For this the millis() funtion is very helpful.
+ * It returns the time in milliseconds
+ * since the program was started.
+ *
+ * Frederic Gmeiner, 2011
+ */
+// create a variable to store the last time
+// our event was triggered. (the long datatype
+// can store much larger numbers as an integer)
+long lastMillis= 0;
+// define the length of the interval
+int interval = 1000;
+void draw(){
+  // check whether the interval time has passed:
+  if(millis() - lastMillis > interval){
+    // once the interval time has passed,
+    // update the lastMillis so that we need to
+    // wait again for 1000 milliseconds.
+    lastMillis = millis();
+    // trigger the event:
+    println(millis()/1000);
+  }
+}
 </source>
 <br /> <br />