The second type of coordinates for drawing are screen coordinates. These count actual pixels on the screen, and start at the upper left hand corner. The screen is 62 by 96 pixels. Using these coordinates keeps menus rigid and in place, but it takes the calculator longer to draw, and it may require a lot of trial and error until you get the idea.
Text( function
The text function works just like the Disp function (You can write text, numbers, variables, strings), but displays it on the graph screen, allowing for labels or menus. Text is in the draw menu [2ND] [PRGM] [0]. The syntax is this:
Text(StartX1,StartY1,Text)(Written text (not variables or numbers), needs to be in quotes)
An example of a menu using lines and text
Pxl-On( function
The Pxl-On function draws a single pixel on the screen at a point you specify. The syntax is Pxl-On(X,Y).
Pxl-Off( function
Works just like Pxl-On, but turns a pixel off (to white).
Pxl-Change( function
Changes the pixel (Black to white, white to black)
Pxl-Test( function:
Tests whether the pixel is on at the current coordinates. Returns 1 if true, or 0 if false.