DONE

Viewpoint demo

yt

• On YT

  https://www.youtube.com/watch?v=9G0r7jL3xl8

• Full title

  VIEWPOINT toward a computer for visual thinkers

• Personal interpretation

  the Viewpoint editor takes an advantage feature of the Spreadsheets, visibility, to the extreme and to a graphics/text editor.

• Viewpoint

• An editor to write and to draw

• Visibility

  the condition that all of the state of the system is exposed on the UI

in viewpoint the pixels in the screen are literally the state of the system. The computer looks at the pixels in the screen to see what's going on, instead of referring to some secret invisible variable stored somewere in memory

• All pixels in the screen can be re-drawn, including the ones showing a character from the keyboard

• When a key is pressed

• The corresponding character cell is highlighed

• The character is copied to the cursor

• The cursor is moved 1 cel to the right

• This allows to edit the characters typed by the keyboard just by editing them on-screen

• Editor word-wraps when it hits a cell that has a character not found on the on-screen keyboard cells

• Composed of two programs that take turns looking at the screen

• User program

• Reads keyboard and mouse, writes the red cursor and highlights

• When done passes the control to processor by drawing a triangle (interlock) before "Processor"

• Processor program

• Locates red cursor

• Locates red hightlights

• Takes action

• Passes control to User program by redrawing the triangle (interlock)

• Visual boot

  [ 12:15 ] How the image/state was setup in the beginning from viewpoint itself

• Only elements

• Interlock

• Selection

• Cursor