Processing Basics 1

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Processing: Basics
June-Hao Hou

Basic Structure
setup()
draw()

Basic Structure
setup()
draw()
events?
event handlers
declarations
True
False
eventdetection

Basic Structure
setup()
draw()
events?
event handlers
True
False
declarationsLibraries Classes
eventdetection

Coordinates
stroke(0, 128, 128);
noFill();
rect(0, 0, 10, 10);
+x
+y
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
0 1 2 3 4 5 6 7 8 ...

Basic Shapes
point(20, 30);
(20, 30)
(3, 5)
(30, 50)
line(3, 5, 30, 50);
rect(0, 0, 10, 10);
(0, 0)
10
10
ellipse(20, 30, ...

Modes of Shape
rectMode(CORNER);
rect(0, 0, 10, 10);
(0, 0)
10
10
(0, 0)
(10, 10)
rectMode(CORNERS);
rect(0, 0, 10, 10);
r...

Variable Scope
int x;
void setup() {
int w = 200;
x = 0;
size(w, w);
}
void draw() {
int y;
x = x + 1;
y = x * 2;
rect(0, ...

Variable Scope
class Cube {
float cx;
float cy;
float size;
Cube(float x, float y, float s) {
cx = x;
cy = y;
size = s;
}
...

For Loop
expressions
condition
True
False
init-statement
next-statement
•init-statement
初始敘述
•condition
繼續執⾏行的條件
•next-sta...

For Loop
for (int i = 0; i < 5; i++) {
print(i);
}
01234
for (int i = 0; i <= 5; i++) {
print(i);
}
012345
for (int i = 1;...

$For Loop for (int i = 0; i < 5; i++) { print(_______); } 43210 for (int i = ____; ____; i--) { print(i); } 43210 for (int ...$

For Loop
for (int i = 0; i < 5; i++) {
print(4 - i);
}
43210
for (int i = 4; i >= 0; i--) {
print(i);
}
43210
for (int i =...

For Loop
for (int i = 0; i < 100; i = i + 10) {
if (i % 5 == 0) i = i - 5;
println(i);
}
for (int i = 0; true; i++) {
// D...

For Loop
for (int i = 0; i < 100; i = i + 10) {
if (i % 5 == 0) i = i - 5;
println(i);
}
-5
0
5
10
15
...
90 (執⾏行20次)
for ...

For Loop
for (int i = 0; i < 5; i++) {
print("X");
}
println();
XXXXX
for (int j = 0; j < 5; j++) {
for (int i = 0; i < 5;...

For Loop
for (int j = 0; j < 5; j++) {
for (int i = j; i < 5; i++) {
print("X");
}
println();
}
for (int j = 0; j < 5; j++...

For Loop
for (int j = 0; j < 5; j++) {
for (int i = j; i < 5; i++) {
print("X");
}
println();
}
XXXXX
XXXX
XXX
XX
X
for (i...

For Loop
X X X
X X X
X X X
i=0 i=1 i=2 i=3 i=4
j=0
j=1
j=2
j=3
j=4
(i % 2) == 0 && (j % 2) == 0

For Loop
X X X
X X
X X
X X
X X X
i=0 i=1 i=2 i=3 i=4
j=0
j=1
j=2
j=3
j=4
((i == 0 || i == 4) || (j == 0 || j == 4))
&& (i ...

For Loop
XXXXX
X X
X X
X X
XXXXX
X X
X X
X
X X
X X
XXXXX
XXX
X
XXX
XXXXX
X X X
X X
X X X
X X
X X X
XXXX
X XXX
XX XX
XXX X
...

For Loop
XXXXX
X X
X X
X X
XXXXX
X X
X X
X
X X
X X
XXXXX
XXX
X
XXX
XXXXX
((i == 0) || (i == 4)) || ((j == 0) || (j == 4))
...

For Loop
X X X
X X
X X X
X X
X X X
XXXX
X XXX
XX XX
XXX X
XXXX
XXXX
XXX X
XX XX
X XXX
XXXX
(i + j) % 2 == 0
!(i == j)
!(i ...

For Loop
X X
XX XX
XXXXX
XX XX
X X
XXX
X X X
XX XX
X X X
XXX
X
X X
X X
X X
X
((i >= j) && (i >= 4 - j)) || ((i <= j) && (i...

For Loop
XXXXX
XXXX
XXX
XX
X
X
XX
XXX
XXXX
XXXXX
XXXXX
XXXX
XXX
XX
X
X
XX
XXX
XXXX
XXXXX
i >= j
i <= j
i <= 4 - j
i >= 4 -...

For Loop
int i = 0;
for (int i = 0; i < 5; i++) {
print(i);
}
print(i);
int i;
for (i = 0; i < 5; i++) {
print(i);
}
print...

For Loop
int i = 0;
for (int i = 0; i < 5; i++) {
print(i);
}
print(i);
012340
int i = 0;
for (i = 0; i < 5; i++) {
print(...

While Loop
int k = 0;
while (k < 5) {
print(k);
k++;
}
01234
for (int k = 0; k < 5; k++) {
print(k);
}
同義寫法
01234

While Loop
int k = 0;
do {
print(k);
k++;
} while (k < 5);
01234

Calculation
a = ceil(9.2); 10
a = floor(9.2); 9
a = round(9.2); 9
x = constrain(x, 0, 10);
c = lerp(0, 10, 0.5); c = 5
n =...

Coding Style
float vx,vy, x,y;
void setup() {
size(200,200 );
vx=random(4);
vy= random(4);
x=random( 100)+50;
y=random(100...

OpenProcessing.org
http://www.openprocessing.org/user/907
Student
works
Examples

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