IFD:PhysicalComp2011: Difference between revisions

IFD:PhysicalComp2011 (view source)

Revision as of 12:19, 25 October 2011

2,230 bytes added , 25 October 2011

→‎24.10.2011 Processing sketches

Frederic Gmeiner

213

edits

@@ Line 168: / Line 168: @@
 ellipse(100,100,20,20);
 </source>
+=== II Relations ===
+<source lang="java">
+/* RELATIONS
+ *
+ * Instead of using fixed values, we use variables
+ * to formulate relations. In this example a structure
+ * based on two vertical parallel lines with a circle
+ * in between is formulated.
+ *
+ * Frederic Gmeiner 2011
+ */
+// variable to store the radius of the circle:
+int rad = 40;
+// variables to store the x and y position of the structure:
+int startPointX = 100;
+int startPointY =100;
+size(400,400);
+// left line starts at the defined values and has a length of 80px:
+line(startPointX, startPointY, startPointX, startPointY+80);
+// the ellipse in between the two lines has a radius of "rad",
+// so the width and hight is "2*rad". Since ellipses have their
+// origin in the middle in processing, we need to add the radius
+// to our "startPointX" value to have it centered in between the lines:
+ellipse(startPointX+rad, startPointY+40, 2*rad, 2*rad);
+// the right line is set in relation to the width of the circle:
+line(startPointX+(2*rad), startPointY, startPointX+(2*rad), startPointY+80);
+</source>
+=== III Functions ===
+<source lang="java">
+/* FUNCTIONS
+ *
+ * Here we define a custom function ("crossFunction()") which draws a
+ * cross onto the screen.
+ * It takes the parameters: X value, Y value and the size.
+ * Also the continuous mode is introduced, which
+ * uses the processing functions setup() and draw().
+ * Via the pre-defined variables "mouseX" and "mouseY" we
+ * can access the current mouse position.
+ *
+ * Frederic Gmeiner 2011
+ */
+// the setup() function is called everytime the program
+// starts once.
+void setup(){
+  size(400,400);
+}
+// the draw() function is the main loop function of your program:
+// after every operation in the draw function has been
+// called, the draw function is called again. this
+// goes on until the program quits.
+void draw(){
+  background(255);
+  crossFunction(mouseX,mouseY,10);
+}
+// this is the definition of the custom function "crossFunction()":
+void crossFunction(int crossX, int crossY, int crossSize){
+  line(crossX-crossSize/2, crossY-crossSize/2, crossX+crossSize/2, crossY+crossSize/2);
+  line(crossX+crossSize/2, crossY-crossSize/2, crossX-crossSize/2, crossY+crossSize/2);
+}
+</source>
 [[Category:WS11]]