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8.6: More Setup Code

  • Page ID
    13609
  • XMARGIN = int((WINDOWWIDTH - BOARDWIDTH * BOXSIZE) / 2)
    TOPMARGIN = WINDOWHEIGHT - (BOARDHEIGHT * BOXSIZE) - 5
    

    The program needs to calculate how many pixels are to the left and right side of the board to use later in the program. WINDOWWIDTH is the total number of pixels wide the entire window is. The board is BOARDWIDTH boxes wide and each box is BOXSIZE pixels wide. If we subtract BOXSIZE pixels from this for each of the boxes wide in the board (which is BOARDWIDTH * BOXSIZE), we’ll have the size of the margin to the left and right of the board. If we divide this by 2, then we will have the size of just one margin. Since the margins are the same size, we can use XMARGIN for either the left-side or right-side margin.

    We can calculate the size of the space between the top of the board and the top of the window in a similar manner. The board will be drawn 5 pixels above the bottom of the window, so 5 is subtracted from topmargin to account for this.

    Figure 31

    #               R    G    B
    WHITE       = (255, 255, 255)
    GRAY        = (185, 185, 185)
    BLACK       = (  0,   0,   0)
    RED         = (155,   0,   0)
    LIGHTRED    = (175,  20,  20)
    GREEN       = (  0, 155,   0)
    LIGHTGREEN  = ( 20, 175,  20)
    BLUE        = (  0,   0, 155)
    LIGHTBLUE   = ( 20,  20, 175)
    YELLOW      = (155, 155,   0)
    LIGHTYELLOW = (175, 175,  20)
    
    BORDERCOLOR = BLUE
    BGCOLOR = BLACK
    TEXTCOLOR = WHITE
    TEXTSHADOWCOLOR = GRAY
    COLORS      = (     BLUE,      GREEN,      RED,      YELLOW)
    LIGHTCOLORS = (LIGHTBLUE, LIGHTGREEN, LIGHTRED, LIGHTYELLOW)
    assert len(COLORS) == len(LIGHTCOLORS) # each color must have light color
    

    The pieces will come in four colors: blue, green, red, and yellow. When we draw the boxes though, there will be a thin highlight on the box in a lighter color. So this means we need to create light blue, light green, light red, and light yellow colors as well.

    Each of these four colors will be stored in tuples named COLORS (for the normal colors) and LIGHTCOLORS (for the lighter colors).

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