CLASS OBJECTIVE
Practice the loop and draw_line call using the graph window in Raptor, by creating a given image, using lines and loops.
CLASS ACTIVITIES
FIRST ALGORITHM
Now, you'll have to create an algorithm, using lines and loops, to draw a grid like the one in the image.
- To draw the vertical lines you have to increase the X value, by 10.
- To draw the horizontal lines, you have to increase the Y value, by 10.
Here's a unfinished example, you'll have to complete the algorithm. Create a new Raptor file and name it STUDENT NUMBER + GRID 
SECOND ALGORITHM
After you create the grid, now you'll use lines and loops once again to create the next product in the graph window.
You'll have to understand that while the X value increases, the Y value decreases, in both cases.
THIRD ALGORITHM
All by your self, create a Chess board (8x8) in a 400x400 pixels window, using today's first algorithm as an example.
Figure out how to fill the squares using loops. (It's not an easy task). Create a new Raptor file and name it STUDENT NUMBER + CHESSBOARD
CLASS NOTES
Write down in your notebook the title of the class, the objective and follow the instructions.
- Draw the first flowchart.
- Explain the loop structure and the draw_line coordinates.
