Major update to extrusion; also creates color.blend(rgb1,rgb2) function

Author: BruceSherwood

lib/compiling/GScompiler.js

@@ -702,7 +702,7 @@ where compile() was called, in untrusted/run.js.
 					let pre = m.index-1
 					if (pre >= 0) {
 						let p = line[pre]
-						ok = (p == 'w' || p == '.' || p == ' ' || p == '=')
+						ok = (p == 'w' || p == '.' || p == ' ' || p == '=' || p == '(')
 					}
 					if (ok) newprogram += '  '+indent+'sleep(0.1)'
 				}

lib/glow/color.js

@@ -75,6 +75,25 @@
             var g = Math.floor(255 * colvec.y)
             var b = Math.floor(255 * colvec.z)
             return 'rgba(' + r + ',' + g + ',' + b + ',' + opacity + ')'
+        },
+        blend: function (c1, c2) { // convert two rgb colors to hsv, average the hues, return blended rgb
+            let hsv1, hsv2, small, big, temp, hue
+            hsv1 = color.rgb_to_hsv(c1)
+            hsv2 = color.rgb_to_hsv(c2)
+            if (hsv1.x < hsv2.x) {
+                small = hsv1.x
+                big = hsv2.x
+            } else {
+                small = hsv2.x
+                big = hsv1.x
+            }
+            if (big-small > 0.5) {
+                temp = small+1
+                small = big
+                big = temp
+            }
+            hue = (small+big)/2
+            return color.hsv_to_rgb( vec(hue, (hsv1.y+hsv2.y)/2, (hsv1.z+hsv2.z)/2) )
         }
     }