Apple Newton Utilities User's Guide download pdf (Page 528)

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CHAPTER 13

Drawing and Graphics

13-2 About Drawing

Note that for all of the functions described in this chapter:

■ The coordinates you specify are interpreted as local to the view in which the

object is drawn.

■ The origin of the coordinate plane (0,0) is the upper-left corner of the view in

which the object is drawn.

■ Positive values are towards the right or the bottom of the screen from the origin.

For additional information on the Newton coordinate system see “Coordinate

System” (page 3-6).

Shape-Based Graphics 13

Newton system software provides functions for drawing primitive graphic objects

in a view. These drawing functions return a data structure called a shape that is

used by the drawing system to draw an image on the screen. The drawing system

supports the following shape objects:

■ lines

■ rectangles

■ rounded rectangles

■ ovals (including circles)

■ polygons

■ wedges and arcs

■ regions

■ text

■ pictures

■ bitmaps

Complex graphics can be drawn by passing arrays of shapes to the various drawing

functions. Primitive shapes can be combined procedurally by collecting them into a

shape called a picture. The appearance will be the same except that, when drawn,

the picture will not be affected by any style speciﬁcations. The styles are recorded

into the picture when you make it with

MakePict—with the exception of any

transform or clipping slot. See “Controlling Clipping” (page 13-12) and

“Transforming a Shape” (page 13-13) for more information.

Each type of shape is described in the following pages.

A line is deﬁned by two points: the current

x and y location of the graphics pen and

the

x and y location of its destination. The pen hangs below the right of the deﬁning

points, as shown in Figure 13-1, where two lines are drawn with two different

pen sizes.

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Apple Newton Utilities User's Guide Page 528

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