{"id":285167,"date":"2017-04-18T19:35:57","date_gmt":"2017-04-18T15:35:57","guid":{"rendered":"http:\/\/savepearlharbor.com\/?p=285167"},"modified":"-0001-11-30T00:00:00","modified_gmt":"-0001-11-29T21:00:00","slug":"","status":"publish","type":"post","link":"https:\/\/savepearlharbor.com\/?p=285167","title":{"rendered":"3D \u043f\u0435\u0447\u0430\u0442\u043d\u044b\u0439 \u044f\u0439\u0446\u0435\u0431\u043e\u0442 \u0432\u0441\u0435\u0433\u043e \u0437\u0430 $15. \u0420\u0435\u0446\u0435\u043f\u0442 \u043f\u0440\u0438\u0433\u043e\u0442\u043e\u0432\u043b\u0435\u043d\u0438\u044f"},"content":{"rendered":"

\u0412\u0441\u0435\u043c \u043f\u0440\u0438\u0432\u0435\u0442!<\/p>\n

\"image\"\/<\/p>\n

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\u0412\u043e\u0442 \u0442\u0430\u043a\u0438\u0435 \u043f\u0440\u043e\u0438\u0437\u0432\u0435\u0434\u0435\u043d\u0438\u044f \u0438\u0441\u043a\u0443\u0441\u0441\u0442\u0432\u0430 \u043f\u043e\u043b\u0443\u0447\u0430\u044e\u0442\u0441\u044f \u043d\u0430 \u0432\u044b\u0445\u043e\u0434\u0435:<\/p>\n

\"image\"\/<\/p>\n

\u041f\u0440\u043e\u0441\u0442\u044b\u0435 \u043a\u0430\u0440\u0442\u0438\u043d\u043a\u0438 \u043c\u043e\u0436\u043d\u043e \u0440\u0438\u0441\u043e\u0432\u0430\u0442\u044c \u0432 \u043b\u044e\u0431\u043e\u043c \u0432\u0435\u043a\u0442\u043e\u0440\u043d\u043e\u043c \u0440\u0435\u0434\u0430\u043a\u0442\u043e\u0440\u0435, \u0430 \u0441\u043b\u043e\u0436\u043d\u044b\u0435 \u0433\u0435\u043e\u043c\u0435\u0442\u0440\u0438\u0447\u0435\u0441\u043a\u0438\u0435 \u043e\u0431\u044a\u0435\u043a\u0442\u044b \u043c\u043e\u0436\u043d\u043e \u0441\u043e\u0437\u0434\u0430\u0442\u044c, \u043d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, \u043d\u0430 \u043f\u0438\u0442\u043e\u043d\u0435.<\/p>\n

\u0412\u043e\u0442 \u043f\u0440\u0438\u043c\u0435\u0440 \u0442\u0430\u043a\u043e\u0439 \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u044b:<\/b><\/p>\n
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# Generate a 3200 x 800 geometrical pattern for Eggbot plotting # See http:\/\/www.egg-bot.com\/ for info on the Eggbot # # Dan Newman, 2 January 2011 # dan dot newman at mtbaldy dot us # Public domain (http:\/\/creativecommons.org\/licenses\/publicdomain\/)  HEIGHT = float( 800.0 ) WIDTH = float( 3200.0 )  scale = WIDTH \/ ( 16.0 * 3 )  # 16 horizontal repeats epsilon = float(1.0e-5)  # Relative moves for drawing the vertical elements DOWN  = [[0.0, scale], [scale, 2*scale], [0.0, scale], [-scale, 2*scale]] UP    = [[0.0, -scale], [scale, -2*scale], [0.0, -scale], [-scale, -2*scale]]  # How to switch to going up when you stop going down after DOWN[i] DU_switch = [scale, -scale, -scale, scale]  # Relative moves for drawing the horizontal elements (L2R = left-to-right) L2R = [[scale, 0.0], [2*scale, scale], [scale, 0.0], [2*scale, -scale]] R2L = [[-scale, 0.0], [-2*scale, scale], [-scale, 0.0], [-2*scale, -scale]]  # How to switch to R2L after stopping in L2R at index i LR_switch = [scale, -scale, -scale, scale]  # Compute the intersection of two lines # See eggbot_hatch.py for complete details  def intersect( P1, P2, P3, P4 ):  \t''' \tDetermine if two line segments defined by the four points P1 & P2 and \tP3 & P4 intersect.  If they do intersect, then return the fractional \tpoint of intersection "sa" along the first line at which the \tintersection occurs. \t'''  \t# Precompute these values -- note that we're basically shifting from \t# \t#\t\tP = P1 + s (P2 - P1) \t# \t# to \t# \t# \t\tP = P1 + s D \t# \t# where D is a direction vector.  The solution remains the same of \t# course.  We'll just be computing D once for each line rather than \t# computing it a couple of times.  \tD21x = P2[0] - P1[0] \tD21y = P2[1] - P1[1] \tD43x = P4[0] - P3[0] \tD43y = P4[1] - P3[1]  \t# Denominator \td = D21x * D43y - D21y * D43x  \t# Return now if the denominator is zero \tif d == 0: \t\treturn float( -1 )  \t# For our purposes, the first line segment given \t# by P1 & P2 is the LONG hatch line running through \t# the entire drawing.  And, P3 & P4 describe the \t# usually much shorter line segment from a polygon. \t# As such, we compute sb first as it's more likely \t# to indicate "no intersection".  That is, sa is \t# more likely to indicate an intersection with a \t# much a long line containing P3 & P4.  \tnb = ( P1[1] - P3[1] ) * D21x - ( P1[0] - P3[0] ) * D21y  \t# Could first check if abs(nb) > abs(d) or if \t# the signs differ. \tsb = float( nb ) \/ float( d ) \tif ( sb < 0 ) or ( sb > 1 ): \t\treturn float( -1 )  \tna = ( P1[1] - P3[1] ) * D43x -  ( P1[0] - P3[0] ) * D43y \tsa = float( na ) \/ float( d ) \tif ( sa < 0 ) or ( sa > 1 ): \t\treturn float( -1 )  \treturn sa  # Determine whether a line segment needs to be clipped to # fit within the drawing page  def clip( x1, y1, x2, y2 ): \tif ( x1 >= 0.0 ) and ( x1 <= WIDTH ) and ( x2 >= 0.0 ) and ( x2 <= WIDTH ) and \\ \t\t\t( y1 >= 0.0 ) and ( y1 <= HEIGHT ) and ( y2 >= 0.0 ) and ( y2 <= HEIGHT ): \t\treturn float( -1.0 )  \tif ( x1 < 0.0 ) or ( x2 < 0.0 ): \t\ts = intersect( [x1, y1], [x2, y2], [0.0, 0.0], [0.0, HEIGHT] ) \t\tif ( s > 0.0 ): \t\t\treturn s  \tif ( x1 > WIDTH ) or ( x2 > WIDTH ): \t\t# We allow going an extra pixel across in case there is drawing error \t\ts = intersect( [x1, y1], [x2, y2], [WIDTH+1.0, 0.0], [WIDTH+1.0, HEIGHT] ) \t\tif ( s > 0.0 ): \t\t\treturn s  \tif ( y1 < 0.0 ) or ( y2 < 0.0 ): \t\ts = intersect( [x1, y1], [x2, y2], [0.0, 0.0], [WIDTH, 0.0] ) \t\tif ( s > 0.0 ): \t\t\treturn s  \tif ( y1 > HEIGHT ) or ( y2 > HEIGHT ): \t\ts = intersect( [x1, y1], [x2, y2], [0.0, HEIGHT], [WIDTH, HEIGHT] ) \t\tif ( s > 0.0 ): \t\t\treturn s  \treturn float( -1.0 )  # Plot a collection of line segments  def plot( points, color='black' ):  \t# First line segment \ts = clip( points[0][0], points[0][1], points[1][0], points[1][1] ) \tif ( s < 0.0 ): \t\tp = 'M %f,%f' % ( points[0][0], points[0][1] ) \telse: \t\tp = 'M %f,%f' % ( points[0][0] + s * ( points[1][0] - points[0][0] ), \t\t\t\t\t\t  points[0][1] + s * ( points[1][1] - points[0][1] ) ) \tx0 = points[1][0] \ty0 = points[1][1] \tp += ' L %f,%f' % ( x0, y0 )  \t# Intermediate line segments \tfor i in range(2, len( points ) - 1): \t\tx0 = points[i][0] \t\ty0 = points[i][1] \t\tp += ' L %f,%f' % ( x0, y0 )  \t# Final line segment \tx = points[-1][0] \ty = points[-1][1] \ts = clip( x0, y0, x, y ) \tif ( s < 0.0 ): \t\tp += ' L %f,%f' % ( x, y ) \telse: \t\tp += ' L %f,%f' % ( x0 + s * ( x - x0 ), y0 + s * ( y - y0 ) )  \tprint '<path stroke="%s" stroke-width="1" fill="none" d="%s"\/>' % ( color, p )  # Draw the vertical elements  def vertical( x, y, color, down, up ):  \tif ( y > ( scale + epsilon ) ): \t\ti = len( down ) - 1 \t\twhile ( y > ( scale + epsilon) ): \t\t\tx -= down[i][0] \t\t\ty -= down[i][1] \t\t\ti -= 1 \t\t\tif ( i < 0 ): \t\t\t\ti = len( down ) - 1 \telse: \t\ti = -1  \tpoints = [[x, y]] \twhile ( y < ( HEIGHT - epsilon ) ): \t\ti += 1 \t\tif ( i >= len( down ) ): \t\t\ti = 0 \t\tx += down[i][0] \t\ty += down[i][1] \t\tpoints.append( [x, y] )  \tplot( points, color )  \tx += DU_switch[i] \tpoints = [[x, y]] \twhile ( y > epsilon ): \t\tx += up[i][0] \t\ty += up[i][1] \t\tpoints.append( [x, y] ) \t\ti -= 1 \t\tif ( i < 0 ): \t\t\ti = len( up ) - 1  \tplot( points, color )  # Draw the horizontal elements  def horizontal( x, y, color, l2r, r2l ):  \tif ( x > ( scale + epsilon ) ): \t\ti = len( l2r ) - 1 \t\twhile ( x > ( scale + epsilon ) ): \t\t\tx -= l2r[i][0] \t\t\ty -= l2r[i][1] \t\t\ti -= 1 \t\t\tif ( i < 0 ): \t\t\t\ti = len( l2r ) - 1 \telse: \t\ti = -1  \tpoints = [[x, y]] \twhile ( x < ( WIDTH - epsilon ) ): \t\ti += 1 \t\tif ( i >= len( l2r ) ): \t\t\ti = 0 \t\tx += l2r[i][0] \t\ty += l2r[i][1] \t\tpoints.append( [x, y] )  \tplot( points, color )  \ty += LR_switch[i] \tpoints = [[x, y]] \twhile ( x > epsilon ): \t\tx += r2l[i][0] \t\ty += r2l[i][1] \t\tpoints.append( [x, y] ) \t\ti -= 1 \t\tif ( i < 0 ): \t\t\ti = len( r2l ) - 1  \tplot( points, color )  print '<svg xmlns:inkscape="http:\/\/www.inkscape.org\/namespaces\/inkscape" width="%d" height="%d">' % ( int( WIDTH ), int( HEIGHT ) ) print '<g inkscape:groupmode="layer" inkscape:label="1 - vertical">'  Color = 'green' x1 = 0.0 y1 = 0.0 x2 = 1.5 * scale y2 = 1.5 * scale while ( x1 < ( WIDTH - epsilon ) ): \tvertical( x1, y1, 'green', DOWN, UP ) \tif ( x2 < ( WIDTH - epsilon ) ): \t\tvertical( x2, y2, 'green', DOWN, UP ) \tx1 += 3 * scale \tx2 += 3 * scale  print '<\/g>' print '<g inkscape:groupmode="layer" inkscape:label="2 - horizontal">'  x1 = 0.0 y1 = 0.0 x2 = 1.5 * scale y2 = 1.5 * scale while ( y1 < ( HEIGHT - epsilon ) ): \thorizontal( x1, y1, 'blue', L2R, R2L) \tif ( y2 < ( HEIGHT - epsilon ) ): \t\thorizontal( x2, y2, 'blue', L2R, R2L) \ty1 += 3 * scale \ty2 += 3 * scale  print '<\/g>' print '<g inkscape:groupmode="layer" inkscape:label="3 - border">' print '<path stroke="black" stroke-width="1" fill="none" d="M 0,0 l %d,0"\/>' % ( int( WIDTH ) ) print '<path stroke="black" stroke-width="1" fill="none" d="M 0,%d l %d,0"\/>' % ( int( HEIGHT ), int( WIDTH ) ) print '<\/g>' print '<\/svg>'<\/code><\/pre>\n
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  \u0410 \u0432\u043e\u0442 \u043f\u043e\u043b\u0443\u0447\u0438\u0432\u0448\u0435\u0435\u0441\u044f \u0438\u0437\u043e\u0431\u0440\u0430\u0436\u0435\u043d\u0438\u0435 \u0443\u0436\u0435 \u043d\u0430 \u044f\u0439\u0446\u0435:<\/p>\n
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  \u042d\u043d\u0442\u0443\u0437\u0438\u0430\u0441\u0442\u044b \u0441\u043e\u0437\u0434\u0430\u044e\u0442 \u0434\u0430\u0436\u0435 \u043a\u0430\u0440\u0442\u0438\u043d\u043a\u0438 \u0441\u043e \u0441\u0442\u0440\u043e\u0431\u043e\u0441\u043a\u043e\u043f\u0438\u0447\u0435\u0441\u043a\u0438\u043c \u044d\u0444\u0444\u0435\u043a\u0442\u043e\u043c \u043f\u0440\u0438 \u0432\u0440\u0430\u0449\u0435\u043d\u0438\u0438:<\/p>\n
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