Lawrence Snyder University of Washington, Seattle © Lawrence Snyder 2004.

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Lawrence Snyder University of Washington, Seattle © Lawrence Snyder 2004

10/2/2015© 2010 Larry Snyder, CSE2 The app works like the children’s toy. To move a piece, click on the one to be moved

10/2/2015© 2010 Larry Snyder, CSE3

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 The tiles[ ] array is initialized with digits, but it could have been assigned in a loop  The shade[ ] array is just a series of cells … it is initialized in a loop in setup( ) 10/2/2015© 2010 Larry Snyder, CSE7

 We can now draw numbers from tiles[ ] with colors from shade[ ] 10/2/2015© 2010 Larry Snyder, CSE8

 convert from r/c ref.s to array index ref.s 10/2/2015© 2010 Larry Snyder, CSE9

10/2/2015© 2010 Larry Snyder, CSE10

 Like the birthday array, when we click on a tile, we compute the row and column as row = (mouseY - 100)/50; col = (mouseX - 100)/50;  If the present open position is at ex,wy then what are legal moves?  The row or col can change by 1 but not both  Say that as: abs(row-ex) + abs(col-wy) == 1 10/2/2015© 2010 Larry Snyder, CSE11

 And if (abs(row-ex) + abs(col-wy) == 1) then what?  Exchange tiles[ ] values  Exchange shade[ ] values … for ex,wy with row,col  An example exchange …  To exchange values of a and b int temp = a; a = b; b = temp; 10/2/2015© 2010 Larry Snyder, CSE12 Standard Technique

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 Sketched the idea on paper  Started with simplest stuff  Built on previous work by adding one function or one idea at a time  Checked after every improvement 10/2/2015© 2010 Larry Snyder, CSE15