Tetris

What if we had no grid?

Up and running

Install node and yarn. Then:

yarn install
yarn global add browserify budo
./scripts/dev.sh

things

• a shape
  • has a list of occupied cell coordinates (by x,y) at reference orientation
  • has presentation info (like color)
  • has a name?
• the basic shapes: line, square, left-s, right-s, left-l, right-l, tee
• a piece
  • is of a shape
  • at an orientation (0-3)
  • at a position (x:0-10; y:0-20; 0,0 at top left)
• a dead cell
  • is of a shape (e.g., for color)
  • at x,y
• a game
  • has a list of dead cells
  • has a live piece (could be 1st/last in list?)

events

• on start:
  • add/make live piece:
    • random shape
    • x position near middle
    • if would violate, do end
• on tick or down move:
  • move down 1
  • handle potential landing
• on lateral move (left/right):
  • unless would violate
  • move piece 1 left/right
• on rotate:
  • unless would violate
  • increment live piece orientation 1, modulo 4
  • handle potential landing

functions

• would violate: given a candidate piece whether:
  • piece extent would exceed x-boundary (0,10)
  • piece would overlap a dead cell
• potential landing:
  • if live piece: did land:
    • add its cells to dead cell list
    • for any complete (gapless, edge-to-edge) row in dead cell list
      • remove all cells in the row
      • move all cells above the row down
    • increment score by some function of count of lines removed
    • do start
• did land: whether any:
  • any cell of live piece is any:
    • directly above (y-1) that of any dead cell
    • on bottom row

presentation

• on any change, render grid of cells:
  • for each x,y, display for shape in that x,y
• tick every second or so