shapeO operation

Syntax

• shapeO(frontWidth, rightWidth, backWidth, leftWidth ) { selector operator operations | ... }

Parameters

1. frontWidth—float
   Depth of front wing.
2. rightWidth—float
   Width of right wing.
3. backWidth—float
   Depth of rear wing.
4. leftWidth—float
   Width of left wing.
5. selector—selector
   • shape—The setback polygon.
   • remainder—Selects the remainder of the polygon.
6. operator—float
   The operator defines how the setback polygons are used to generate successor shapes. This also applies to shapes with more than one faces. Valid operators are:

   • : —each polygon is put into a new shape.
   • =—all polygons corresponding to the selector are combined into one new shape.
7. operations—float
   A sequence of CGA operations to execute.

Description

The shapeO operation selects a number of edges, depending on predefined spatial selectors, and set them back by a user-defined distance.

Note:

This operation is another way of applying setbacks.

shapeO(frontWidth, rightWidth, backWidth, leftWidth) { selector operator operations | ... }

can also be achieved with the setback operation and the comp function:

setback( comp(fe) { front=frontWidth | right=rightWidth | back=backWidth | left=leftWidth } ) { selector operator operations | ... }

Related

• comp operation
• offset operation
• shapeL operation
• shapeU operation
• setback operation
• setbackPerEdge operation
• setbackToArea operation
• comp function

Examples

A block filled with O-shapes:

attr myFrontDepth = 5
attr myRightWidth = 3
attr myBackDepth = 2
attr myLeftWidth = 11

LotInner -->
    Lot
        
Lot -->
    offset(-3, inside)
    shapeO(myFrontDepth,myRightWidth,myBackDepth,myLeftWidth) 
          { shape : Footprint | remainder : NIL }

Footprint -->
    extrude(rand(10,20)) 
	color(1,0,0)