Add Ruby support contributed by Masaki Fukushima.

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk@518 626c5289-ae23-0410-ae9c-e8d60b6d4f22

SWIG/Examples/GIFPlot/Ruby/full/runme.rb

@@ -0,0 +1,66 @@
+# Plot a 3D function
+require 'gifplot'
+include Gifplot
+include Math
+
+# Here is the function to plot
+def func(x,y)
+  return 5*cos(2*sqrt(x*x+y*y))*exp(-0.3*sqrt(x*x+y*y))
+end
+
+# Here are some plotting parameters
+XMIN = -5.0
+XMAX =  5.0
+YMIN = -5.0
+YMAX =  5.0
+ZMIN = -5.0
+ZMAX =  5.0
+
+# Grid resolution
+NXPOINTS =  60
+NYPOINTS =  60
+
+cmap  = new_ColorMap("cmap")
+frame = new_FrameBuffer(500,500)
+FrameBuffer_clear(frame,BLACK)
+
+P3    = new_Plot3D(frame,XMIN,YMIN,ZMIN,XMAX,YMAX,ZMAX)
+Plot3D_lookat(P3,2*[XMAX-XMIN,YMAX-YMIN,ZMAX-ZMIN].max)
+Plot3D_autoperspective(P3,40)
+Plot3D_rotu(P3,60)
+Plot3D_rotr(P3,30)
+Plot3D_rotd(P3,10)
+
+def drawsolid()
+  Plot3D_clear(P3,BLACK)
+  Plot3D_start(P3)
+  dx = 1.0*(XMAX-XMIN)/NXPOINTS
+  dy = 1.0*(YMAX-YMIN)/NYPOINTS
+  cscale = 240.0/(ZMAX-ZMIN)
+  x = XMIN
+  for i in 0...NXPOINTS
+    y = YMIN
+    for j in 0...NYPOINTS
+      z1 = func(x,y)
+      z2 = func(x+dx,y)
+      z3 = func(x+dx,y+dy)
+      z4 = func(x,y+dy)
+      c1 = cscale*(z1-ZMIN)
+      c2 = cscale*(z2-ZMIN)
+      c3 = cscale*(z3-ZMIN)
+      c4 = cscale*(z4-ZMIN)
+      c = (c1+c2+c3+c4)/4
+      c = 0 if (c < 0)
+      c = 239 if c > 239
+      Plot3D_solidquad(P3,x,y,z1,x+dx,y,z2,x+dx,y+dy,z3,x,y+dy,z4,c+16)
+      y = y + dy
+    end
+    x = x + dx
+  end
+end
+
+puts "Making a nice 3D plot..."
+drawsolid()
+
+FrameBuffer_writeGIF(frame,cmap,"image.gif")
+puts "Wrote image.gif"