# Coordinate Geometry for Graphics

``` By
carefully incrementing the X and/or Y
values of our set of lines, we can create a
game board for a boat game.
 Lines that go from left to right are called
horizontal lines and lines that go up and
down are called vertical lines.
//horizontal grid
line(0,50,800,50);
line(0,100,800,100);
line(0,150,800,150);
line(0,200,800,200);
line(0,250,800,250);
noStroke();
fill(100,0,0);
ellipse(225,225,35,35);
fill(155,0,0);
ellipse(225,225,25,25);
fill(255,0,0);
ellipse(225,225,15,15);
 Create
a playing field grid that accurately
expands upon the given patterns to fill the
canvas.
 Create improved versions of the boat and
explosion graphics.
 Coordinate
Geometry for Graphics
 Making a grid line
 Making an explosion graphic
 Practice 1, 20%
 By
placing large circles or ellipses, we can
create a rainbow effect across the screen.
 Remember to start in the background first
and have the smaller shapes go later in the
code so that the graphic will have the
smaller shapes appear on top or inside of
the larger.
Canvas Setup Code
 size(600, 600);
 background(255,255,255);
 stroke(255,255,255);
 strokeWeight(1);
//search for RGB color codes to find some
examples of colors for fill()
fill(0,150,0);
ellipse(0,0,160,160);
fill(0,100,0);
ellipse(0,0,140,140);


Create a set of circular or elliptical shapes to
encompass the entire canvas.
Set aesthetically pleasing colors for the
different shapes in the fill and/or the stroke
commands.
 Elliptical
Pattern Graphics
 Canvas Setup Code
 fill() and ellipse() code
 Practice 2, 20%
Stick Figure Returns!
 In this part of our project, we will be using lines and
ellipses to make stick figure people.
 The arms are usually drawn as two
separate lines with an upper arm and
a lower arm so that the figure can
Flex their muscles.
size(800, 600);
//gray background
background(100,100,100);
//black lines
stroke(0,0,0);
//10 pixel thick lines
strokeWeight(10);
ellipse(200,200,80,80);
//body
line(200,240,200,340);
//legs
line(200,340,175,460);
line(200,340,250,460);
//upper arm
line(200,240,170,300);
 Follow
the pattern started in the example to
finish the stick figure.
 The stick figure is lonely. Create some
family and/or friends for him on the same
canvas.
 Stick
Figure Returns
 Setting up the Stick Figure Canvas
 Drawing the Figure
 Practice 2: Stick Figure 20%
 Some
times it is a good idea to explore our
games beyond the planet Earth and reach
out into the beyond.
 In this unit we will be making start, orbital
patterns, and planets.
//stars
stroke(255,255,255);
ellipse(random(1,800),random(1,500),1,1);
ellipse(random(1,800),random(1,500),1,1);
ellipse(random(1,800),random(1,500),1,1);
//sun
fill(255,255,00);
ellipse(400,255,100,100);
//planet orbits
noFill();
ellipse(400,255,200,150);
ellipse(400,255,250,200);
//planets
fill(50,50,255);
ellipse(500,255,15,15);
more planets to the solar system with
their predicted orbital paths.
 Create the proper number of stars to make
the space look real.
 Look up the real solar system and try to
make the planets look like they are correct.
 Making
space on our canvas
 Making the stars
 Solar system
 Practice 4, 20%
Linking To this project from the local
directory
• This project is called 30.htm
• If a student were to link to it, the link would look
something like this:
• &lt;a href=“30.htm”&gt; Click here to see project 30
&lt;/a&gt;
 If
a student wanted to link to project 30.htm
from an external source or to send the link
through email, they would need the entire
 For example, John Smith would be like this:
 http://www.scottbunin.com/students/johns
mith
Calling the Index and other files
• The index.htm will come up if a file is not
specified and we load a directory on the Internet.
• If we want to call a specific file, instead of the
index, we have to name the file.
• http://www.scottbunin.com/students/johmsmit
h/30.htm
 An
easy way to link to a classmate, is with
the .. (double period) mark in the link such
as this:
 ../billsmith/30.htm
 In this way, a student could link to their
sibling Bill, who is also getting an A in this
class.
Practice 5, 20%
• Link to another project in your own directory so
a user can click on this project and go to a
previous project.
• Link to a classmates version of this project. Be
sure to ask what they are naming their file!
• Link back to the main index file.


&lt;title&gt;Happy Drawing 2&lt;/title&gt;

&lt;script type=&quot;text/javascript&quot; src=&quot;http://www.scottbunin.com/processing.js&quot;&gt;&lt;/script&gt;


&lt;script type=&quot;text/javascript&quot; src=&quot;http://www.scottbunin.com/init.js&quot;&gt;&lt;/script&gt;

&lt;body&gt;

&lt;script type=&quot;application/processing&quot;&gt;

size(800, 800);

background(0,200,200);

fill(100,100,100);

//horizontal grid

line(0,50,800,50);

line(0,100,800,100);

line(0,150,800,150);

line(0,200,800,200);

line(0,250,800,250);

//vertical grid

line(50,0,50,800);

line(100,0,100,800);

line(150,0,150,800);

line(200,0,200,800);

line(250,0,250,800);

//boat

strokeWeight(2);

stroke(120,120,120);
```