Apple Newton Utilities Guide de l'utilisateur télécharger pdf (Page 548)

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CHAPTER 13

Drawing and Graphics

13-22 Using the Drawing Interface

Notice that there are two types of pictures: bitmaps (a frame with bits, a

bounds, and mask slots) and Format 1 PICTs (binary objects of class picture).

clPictureView can draw both of these types of objects,

so you just need to choose a format and use

SetValue on the icon slot,

as follows:

SetValue(myView, 'icon, kPictureAsBitMap);

SetValue(myView, 'icon, kPictureAsPict);

Optimizing Drawing Performance 13

You can use several methods to make drawing functions execute faster.

If you have a fairly static background picture, you can use a predeﬁned PICT

resource. Create the PICT in your favorite drawing program, and use the PICT as

the background (

clIconView). The graphics system also has a picture-making

function that enables you to create pictures that you can draw over and over again.

If you want to improve hit-testing of objects, use a larger view in combination with

ViewDrawScript or a ViewClickScript rather than using smaller views

with an individual

ViewClickScript. This is especially true of a view that

consists of regular smaller views.

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Apple Newton Utilities Guide de l'utilisateur Page 548

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