Back Then Schematic >>> Now Faster to Prototype! >>> Real World!
Was there IoT in 2009??
Conditional Statements
How does computer language make different decision? So far we learned setup() : something happens at the start, draw(): something same event happens over and over. Also we learned event function like : mousepressed.
Something changes over time.
Today we want to learn something that happens different from previous event. For example, the color of the ellipse changes after one draw, the position of the rectangle change over based on the position of the user's mouse.
Conditional Logic/ Control Structure
if something is true : Do this code
if something is not true : Don't do this code
TRUE
FALSE
1
0
Relational Operator
5 > 8 : False
7 < 210 : True
<
>
=
Greater Than
Less Than
Equal To
if statement
if (boolean expresssion here is true){
this code here exectutes
};
if (1 < 8){
fill(255,0,0);
};
if (mouseX > 100){
fill(255,0,0);
}
Computer Language != Mathematical Expression
var x = 90; // Assignment
if (x == 90); // Conditional Expression
Greater Than
Less Than
Equal To
Not Equal To
Greater Than
or Equal To
Less Than or
Equal To
<
>
=
≠
≤
≥
<
>
==
!=
<=
>=
+
‒
×
÷
+
-
*
/
In-class
Let's make it bouncing! Console.log()
Working Great!
if-else statement
if( something is true){
execute this code
}
else{
execute this code
}
if (mouseX > 100){
fill(255,0,0);
}
else
{
fill(0,0,255);
}
if - else if - else if statement
if (mouseX > 150){
fill(255,0,0);
}
else if(mouseX >120) // 1 else if
{
fill(255,0,255);
}
else if(mouseX >50) // 2 else if
{
fill(0,0,0);
}
else
{
fill(255,255,255);
}
if - if - if statement
if (mouseX > 150){
fill(255,0,0);
}
if(mouseX >120) // 1 else if
{
fill(255,0,255);
}
if(mouseX >50) // 2 else if
{
fill(0,0,0);
}
AND
if (100 < mouseX AND mouseX < 200){ }
if (100 < mouseX && mouseX <200){ }
100 < mouseX AND mouseX < 200
var x,y;
function setup() {
createCanvas(400, 400);
}
function draw() {
background(255,255,255);
stroke(50);
noFill();
if(100 < mouseX && mouseX < 200 ){
fill(255,0,210);
ellipse(200, 200, 50, 50);
}
}
OR
if (100 < mouseX OR mouseX < 200){ }
if (100 < mouseX || mouseX <200){ }
x < 0 OR x > height
var x = 0;
var y = 0;
var speed = 3;
function setup() {
createCanvas(400, 400); }
function draw() {
background(255,255,255);
stroke(50); noFill();
fill(255,0,210);
ellipse(200, y, 50, 50);
if(y < 0 || y > height ){
speed = speed * -1
}
y = y + speed; }
Repeat Loops
if(something is ture){
Do this code
}
// Happened ONCE and Move On!!
While ...하는 동안
while(something is true){
Do this code
}
//Continue this code over, over, onv and over...
Ellipses one by one....
function setup() {
createCanvas(400, 400);
}
function draw() {
background(220);
var x = 0; //local variable
ellipse(x,50,25,25);
x = x + 50;
ellipse(x,50,25,25);
x = x + 50;
ellipse(x,50,25,25);
x = x + 50;
ellipse(x,50,25,25);
x = x + 50;
}
While loop
var x = 0;
while(x < width){
ellipse(x,50,25,25);
x = x + 50;
}
While loop has 3 components:
Initial Variable
var x = 0;
Boolean Condition Test
while(x < width)
Incremental Function
x = x + 50;
For Loop
for( var x = 0 ; x < width ; x = x + 50){
}
function setup() {
createCanvas(400, 400);
}
function draw() {
background(220);
for( var x = 0 ; x < width ; x = x + 50){
ellipse(x,50,25,25);
}
}
Incremental Methods
x = x + 50
x += 50
x = x + 1
x++
For - For Loops
for( var x = 20 ; x < width ; x = x + 50){
for( var y = 20; y < height; y += 50){
ellipse(x,y,20,20);
}
}
Assignment
Make a sketch using both Conditional Statements and Repeat Loops.
