1. Download JES Tool JES: Jython Environment for Students
Python development tool developed by Georgia Tech
Download and install JES at C:/100
From
Select jes windows-java-included.zip
And select “Save As” to download to C:/100

2. Download JES Tool
Right-click on the zip file, select 7-zip, and select ‘Extract Here.’

3. Download media files Under C:\100, you should have C:\100\JES.exe
Create a new folder pics under C:\100
Download
Save into C:\100\pics
Right click and select 7-zip &‘Extract here.”
Under C:\100, you should have
C:\100\JES.exe
C:\100\pics (folder)

4. Python/JES JES IDE (Integrated Development Environment)
Incorporates editing environment
Program pane
Command pane
Watcher button to view debugging

5. Picture Functions in JES
pickAFile() opens a file browser to select a file
makePicture(filename) creates and returns a picture object, from the JPEG file at the filename
show(pic) displays a picture in a window
repaint(picture) to re-display after changing it
FileImage()
pic.draw()

6. How to access a Picture in JES ?
Select a picture file
For example,
myFile = pickAFile()
WARNING: picture file (eiffel.jpg) is NOT a picture
A picture file HAS TO BE converted to a picture object
myPic = makePicture(myFile)
Or,
myPic = makePicture(pickAFile())

7. Other Pixel Functions
getPixel(pic,x,y) to get a single pixel pic.getPixelt(x,y)
getRed, getGreen, and getBlue are functions that
return a color value (between 0 and 255) at a specified pixel
setRed, setGreen, and setBlue are functions that
set its color value at a specified pixel
We can also get, set, and make colors
getColor returns a Color object with three color values at a pixel
setColor sets the pixel to the specified color
makeColor returns a Color object with specified three color values
pickAColor lets you use a color chooser and returns the chosen color

8. Example >>> thisPixel = getPixel(myPic,1,1)
>>> print thisPixel
Pixel, color=color r=168 g=131 b=105
# get/set individual color values
>>> print getRed(thisPixel)
168
>>> setRed(thisPixel,255)
255
>>> color=getColor(thisPixel)
>>> print color
color r=255 g=131 b=105
>>> setColor(thisPixel,color)

9. Example >>> newColor=makeColor(0,100,0)
>>> print newColor
color r=0 g=100 b=0
>>> setColor(thisPixel,newColor)
>>> print getColor(thisPixel)
>>> print color
color r=168 g=131 b=105
>>> print makeDarker(color)
color r=117 g=91 b=73
>>> newcolor=pickAColor()
>>> print newcolor
color r=255 g=51 b=51

10. Change Colors Directly
>>> file=pickAFile()
>>> pict=makePicture(file)
>>> show(pict)
>>> setColor(getPixel(pict,10,100),black)
>>> setColor(getPixel(pict,11,100),black)
>>> setColor(getPixel(pict,12,100),black)
>>> setColor(getPixel(pict,13,100),black)
>>> repaint(pict)

11. LAB Draw a horizontal line of 100 pixel from (20,50) in a picture
Write a Python function hLine(pic, len) to draw a horizontal line of length ‘len’ from (20,50) of a picture ‘pic.’
Write a Python function diag(pic, len, tx,ty) to draw a diagonal line of length ‘len’ starting at location (tx,ty)