Animation Pages 133-141

Function Function Definition Calling a function Parameters Return type and return statement

Function: Intuitive Understanding Function F F(x) X

Examples Add 10 20 10 X=10, y=4 Multiply (x,y) 40 Subtract 6 4

Function concept int z = add(34, 10); // function call Function definition: int add (int x , int y) // x,y formal parameters { int sum;// sum is a local variable sum = x + y; return sum; } add 34 10 X Y sum

translate Translate function moves the origin by the amount specified int x,y; x = 10; y = 10; void draw() { background(30,50,60); translate(x,y); rect(x,y,70,30); x++; if (x> width) x = 0; y++; if (y>height) y = 0; }

Multiple objects Consider a scenario with multiple objects Each with its own initial position Size Speed How will you define these? How will control these? How will you detect collisions among these and take action?

Matrices (or layers) In order to represent independent motion and axes and other attributes, Processing provides pushMatrix() and popMatrix() These create new layers of axes for objects to exist and be controlled independently. Lets look at some examples.