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Dragon - recursively calculates the points of the Dragon Curve

x0 y0 x1 y1 orientation order Dragon c 1 2 sqrt / : xm x0 x1 x0 - ( c * + : ym y0 y1 y0 - ( c * + : r x0 xm x0 - ( c * + ym y0 - ( c * - : s y0 xm x0 - ( c * + ym y0 - ( c * + : t x0 xm x0 - ( c * + ym y0 - ( c * + : u y0 xm x0 - ( c * - ym y0 - ( c * + : order 1 > orientation 0 ≡ points points x0 y0 r s 1 order 1 - Dragon r s x1 y1 0 order 1 - Dragon stack : points points x0 y0 t u 1 order 1 - Dragon t u x1 y1 0 order 1 - Dragon stack : if points points x1 y1 1 2 mat stack : if 8 1 line :

dragon - assigns points variable with start point(x0,y0) then appends the Dragon curve. This method minimises the number of plot points.

x0 y0 x1 y1 orientation order dragon points points x0 y0 1 2 mat x0 y0 x1 y1 orientation order Dragon stack : points 2 1 line : 2050 M N 2 1 sys