The document provides an introduction to JavaScript, covering its syntax, basic drawing commands, and creation of shapes like squares, triangles, and ellipses. It explains how to use variables, colors, and text in drawings while emphasizing the importance of following specific coding rules. Additionally, it highlights the utility of documentation for programming and the fair use of copyrighted material in educational contexts.

1. JavaScript
Art
Drawing with
Programming

2. What is JavaScript
JavaScript is a programming language.
Like English and
other languages,
there are RULES
for writing. This
is called syntax.

3. What does it mean?
You write code on LINES
Each line is numbered.
Blank spaces DON’T Matter

4. Some Rules to Know
1. TOP  DOWN & LEFT  RIGHT
matters!
When you write your code the order it’s
added will tell the computer what to do: IN
THAT ORDER.
2. Always end with a semicolon;
3. SeNTencE cAsE Matters!
A computer can’t see; it can only read

5. Some Rules to Know
4. Starting with double slash makes notes
Anything after // will not be code.
It’s just a note to help you keep
track of things.
5. The Equals sign is not really an
“equals” sign. It means Assign.
It’s read as “GETS”. The left is a
variable and the right is a value.

6. Our Programming Portal
http://bit.ly/jsart

7. Our Programing Field
y = 400 max
x = 400 max
We draw everything inside a square that’s 400
pixels tall (y) and 400 pixels wide (x).

8. Drawing a Square
rect(x, y, w, h)
Try putting in “50” for
all the values.

9. Position Measure: Coordinates
rect(x, y, w, h)
The position, x and y,
is measured from the
top left corner of the
space you work.
y=50
X=50

10. Size Measure: Width & Height
rect(x, y, w, h)
The width & height
dimensions(w & h) are
measured from the TOP
LEFT corner of the shape.
h=50
w=50

11. Add Squares
Each new
rectangle/square
should be on its
own line. This helps humans.
Computers just need to
see the “;” at the end.

12. Draw a House of Squares
We now have a
basic shape for a
house.
But we need more
shapes and some
color to make this
even better.

13. Drawing a Triangle
Triangle(x1,y1,x2,y2,x3,y3)
A triangle is made
up of three pairs
of x and y

14. Drawing a Triangle
Triangle(x1,y1,x2,y2,x3,y3)
X1 & Y1
X2 & Y2 X3 & Y3
Remember: these are
the coordinates from
the top left corner of
the space.

15. Draw your roof
Play around with
different values for
the position of your
roof.

16. Adding Color: Backgrounds
Background(r,g,b)
r  red
g  green
b  blue

17. Helpful Tool: Color Box
Normally you don’t
automatically get this
color box.
Usually programmers have to look up the color
they need. The values range from 0 to 255.
Black is (0,0,0) and White (255,255,255)

18. Position
Background has to go before the other
shapes. It should be a lower number.

19. Line Colors
stroke(r,g,b)
Stroke changes the color
of all the lines after where
its placed.

20. No Lines
noStroke()
noStroke removes the
color of all the lines after
where its placed.
Notice: the “S” is
capitalized

21. Fill: Color for shapes
fill(r, g, b)
Fill will color in shapes
after where it’s placed.

22. Transparent Shapes (with lines)
noFill()
noFill will remove color
from shapes after where
its placed.
Delete “noStroke” or
you won’t have lines

23. Coloring Parts
As you color you’ll
notice that fill will
layer over past colors.

24. Other Shapes: Ellipse
elipse(x, y, w, h)
An ellipse can make a
circle for our sun.
NOTE: The x & y coordinates and the dimensions
are based on the CENTER of the ellipse

25. Other Shapes: Lines
line(x1, y1, x2, y2)
Add a line to the roof.
NOTE: The x1 & y1 coordinates are one end of the
line; x2 & y2 are the other end point.

26. Variables: Neat Shortcuts
var = value
When you change “windowSize” you’ll
change both windows!

27. Text: Adding Words
textSize(size)
text(text, x, y)
You have to set the size, color, content,
and location of the text.

28. Text: “Welcome Home”
You need to include the
parenthesis (“xxx”)
around the text, or the
computer won’t
understand.
NOTE: The x & y coordinates are measured from the
LOWER LEFT corner of the TEXT.

29. Documentation
Documentation is the guide, translator,
and dictionary for a programming
language.

30. Documentation
Good programmers read and have the
documentation open to help them write their
code.

31. Original Class Design & Guide by
Rino A. Landa July 26, 2014
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