REBOL [ File: %mandelb.r Date: 19-Jul-2009 Title: "Mandelbrot" Purpose: "Mandelbrot" Author: "Lami Gabriele" Email: %koteth--gmail--com ] x-siz: 400 y-siz: 400 im: to-image layout [ origin 0x0 box black to-pair x-siz y-siz] bg-color: 200.200.210 make-col: func[ flo ][ ic: to-integer ( 10 * cosine ( erre * 100 ) ) ip: to-integer ( 10 * ( 1 - cosine ( erre * 100 ) ) ) 0.200.0 * ic + ip * 0.0.200 + 120.0.0 ] clear-im: func [im [image!] color [tuple!]][ repeat j im/size/x * im/size/y [poke im j color] ] set-pixel: func [ im [image!] x [integer!] y [integer!] color [tuple!] ] [ poke im (im/size/y - y * im/size/x + x) color ] itmax: 30 minXPos: 0.0 minYPos: 0.0 zoom: 100.0 rmax: 3 norma: func[ xx yy ] [ square-root ((yy ** 2) + (xx ** 2)) ] rescale: func[ coo zoo offs ] [ ( coo / zoo ) + offs ] calc-pixel: func [xPixel yPixel] [ xStart: rescale xPixel zoom ( - 3.0 + minXPos ) yStart: rescale yPixel zoom ( - 2.0 + minYPos ) xcic: xStart ycic: yStart count: 0 r: 0.0 while [ r <= rmax and ( count < itmax ) ][ xtem: (xcic ** 2 ) - (ycic ** 2) + xStart ycic: (2.0 * xcic * ycic ) + yStart r: norma xcic ycic xcic: xtem count: count + 1 ] if (r < rmax)[ return r ] return -1 ] view layout [ text "threshold" tresInp: field to-string rmax text "iterations" iterInp: field to-string itmax text "zoom" zoomInp: field to-string zoom text "x position" icsInp: field to-string minXPos text "y position" ipsInp: field to-string minYPos pgBar: progress 200x15 coal blue 0.0 button "Draw" [ zoom: to-decimal zoomInp/data itmax: to-integer iterInp/data minXPos: to-decimal icsInp/data minYPos: to-decimal ipsInp/data rmax: to-integer tresInp/data clear-im im bg-color repeat x x-siz [ repeat y y-siz [ erre: calc-pixel x y inrange: ( not-equal? erre -1 ) if inrange[ set-pixel im x y make-col erre ] ] if ( x // 10 ) == 0 [ show img ] pgBar/data: ( x / x-siz ) show pgBar ] show img ] at 240X10 img: image im ]