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- README file for the ControlPoints application.
-
- The ControlPoints application looks at seven different approaches to drawing a
- large number of small objects on the screen. The difference in approaches ranges
- from taking a little over a second one way to about 40 milliseconds with another.
- (The first draws each one using moveto, lineto, etc. while the second uses a Type
- 3 font and xyshow.)
-
- The different approaches are:
- Basic drawing - using moveto, lineto, etc to draw each object.
- User paths w/cache - drawing each object individually using a user path but
- caching the path and using translate to take
- advantage of the cache.
- User paths (large array of points) - drawing a number of points at once using
- user paths.
- Rectangle operators - drawing rectangles using rectfill and rectstroke. Large
- arrays are sent at a time instead of drawing each
- rectangle individually.
- Compositing - compositing the image of a control point.
- Show - using a Type 3 font and drawing the points with the
- show operator. The moveto operator is used to
- move between locations.
- XYShow - using a Type 3 font and drawing the points with the
- xyshow operator.
-
- The rectangle and xyshow approaches are by far the fastest. They need the least amount
- of data and they use the fewest operators. These characteristics have a great bearing on
- the efficiency of any PostScript operation.
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- Below lies an annotated list of the files used in the application.
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- ControlView - A subclass of View.
- ControlPoint - A subclass of Object. Manages the type of control point to draw.
- Four shapes are possible (a filled rectangle, a stroked
- rectangle, an x and a cross).
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- ControlViewWraps.psw - Wraps for drawing with the different approaches.
- ControlPointWraps.psw - Wraps and PostScript procedures for the control points.
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- Topics of interest from the ControlPoints application:
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- Passing arrays to rectfill and rectstroke (ControlView)
- Using xyshow (ControlView)
- Creating a Type 3 font (ControlPointWraps.psw)
- Using the numstring encoding type (ControlViewWraps.psw)
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