!Heart Magic
DEF i(x)=x^2-x
DEF j(x)=-x^2-x
DEF k(x)=-x^2+1/2*x+1
DEF l(x)=-x^2-1/2*x+1
DEF m(y)=y^2-y
DEF n(y)=y^2+1/2*y-1
DEF o(y)=y^2-1/2*y-1
DEF p(y)=-y^2+1/2*y+1
DIM A(4,4),B(4,4),C(4,4),D(4,4),E(4,4),F(4,4),G(4,4),H(4,4)
MAT READ A
DATA 1, 0, 0, 0
DATA 0, 1, 0, 0
DATA 0, 0, 1, 0
DATA 0, 0, 0, 1
MAT READ B
DATA -1, 0, 0, 0
DATA 0, 1, 0, 0
DATA 0, 0, 1, 0
DATA 0, 0, 0, 1
MAT READ C
DATA -1, 0, 0, 0
DATA 0, -1, 0, 0
DATA 0, 0, 1, 0
DATA 0, 0, 0, 1
MAT READ D
DATA 1, 0, 0, 0
DATA 0, -1, 0, 0
DATA 0, 0, 1, 0
DATA 0, 0, 0, 1
MAT READ E
DATA 0, 1, 0, 0
DATA -1, 0, 0, 0
DATA 0, 0, 1, 0
DATA 0, 0, 0, 1
MAT READ F
DATA 0, 1, 0, 0
DATA 1, 0, 0, 0
DATA 0, 0, 1, 0
DATA 0, 0, 0, 1
MAT READ G
DATA 0, -1, 0, 0
DATA 1, 0, 0, 0
DATA 0, 0, 1, 0
DATA 0, 0, 0, 1
MAT READ H
DATA 0, -1, 0, 0
DATA -1, 0, 0, 0
DATA 0, 0, 1, 0
DATA 0, 0, 0, 1
SET WINDOW -9.2,9.2,-9.2,9.2
FOR Q=6.9 TO 0 STEP -0.01
SET DRAW mode hidden
CLEAR
DRAW s WITH H*SHIFT(0,Q)
DRAW s WITH F*SHIFT(0,-Q)
DRAW s WITH B*SHIFT(Q,0)
DRAW s WITH D*SHIFT(-Q,0)
DRAW s WITH A*SHIFT(Q,-Q)
DRAW s WITH C*SHIFT(-Q,Q)
DRAW s WITH E*SHIFT(Q,Q)
DRAW s WITH G*SHIFT(-Q,-Q)
WAIT DELAY 0.01
SET DRAW mode explicit
NEXT Q
WAIT DELAY 8
FOR Q=0 TO 6.9 STEP 0.01
SET DRAW mode hidden
CLEAR
DRAW t WITH A*SHIFT(-Q,Q)
DRAW t WITH C*SHIFT(-Q/3,Q)
DRAW t WITH F*SHIFT(Q/3,Q)
DRAW t WITH H*SHIFT(Q,Q)
DRAW u WITH A*SHIFT(-Q,Q/3)
DRAW u WITH C*SHIFT(-Q/3,Q/3)
DRAW u WITH E*SHIFT(Q/3,Q/3)
DRAW u WITH B*SHIFT(Q,Q/3)
DRAW v WITH A*SHIFT(-Q,-Q/3)
DRAW v WITH C*SHIFT(-Q/3,-Q/3)
DRAW v WITH E*SHIFT(Q/3,-Q/3)
DRAW v WITH G*SHIFT(Q,-Q/3)
DRAW v WITH H*SHIFT(-Q,-Q)
DRAW v WITH F*SHIFT(-Q/3,-Q)
DRAW v WITH B*SHIFT(Q/3,-Q)
DRAW v WITH D*SHIFT(Q,-Q)
WAIT DELAY 0.01
SET DRAW mode explicit
NEXT Q
PICTURE t
FOR x=-1 TO 1 STEP 0.01
PLOT LINES: x,i(ABS(x));
NEXT x
FOR y=0 TO (1+SQR(17))/4 STEP 0.01
PLOT LINES: p(y),y;
NEXT y
PLOT LINES
FOR y=(1+SQR(17))/4 TO 0 STEP -0.01
PLOT LINES: o(y),y;
NEXT y
END PICTURE
PICTURE u
FOR x=-1 TO 0 STEP 0.01
PLOT LINES: x,j(x);
NEXT x
FOR y=0 TO 1 STEP 0.01
PLOT LINES: m(y),y;
NEXT y
FOR x=0 TO 2 STEP 0.01
PLOT LINES: x,k(x);
NEXT x
FOR y=-2 TO 0 STEP 0.01
PLOT LINES: n(y),y;
NEXT y
END PICTURE
PICTURE v
FOR y=-2 TO 1 STEP 0.01
PLOT LINES: -i(ABS(y)), y;
NEXT y
FOR x=0 TO -2 STEP -0.01
PLOT LINES: x, l(x);
NEXT x
END PICTURE
PICTURE s
FOR y=-2 TO 1 STEP 0.01
PLOT LINES: -i(ABS(y)), y;
NEXT y
FOR x=0 TO -2 STEP -0.01
PLOT LINES: x, l(x);
NEXT x
FOR x=-2 TO 2 STEP 0.01
PLOT LINES: x, SGN(x)*i(ABS(x));
NEXT x
END PICTURE
END
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