Apple Newton Utilities Guide de l'utilisateur télécharger pdf (Page 542)

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CHAPTER 13

Drawing and Graphics

13-16 Using the Drawing Interface

viewFormat: nil,

ViewSetupFormScript: func()

begin

// aView is the view to be scaled

self.stepchildren := [aView];

end,

...};

Tran sl ating Data Shapes 13

You can use the global functions PointsToArray and ArrayToPoints to

translate points data between a polygon shape (

'polygonShape) and a

NewtonScript array.

Finding Points Within a Shape 13

Use the HitShape function to determine whether a pen event occurred within the

boundaries of the shape. This operation is useful for implementing button-like

behavior in any shape. Possible results returned by the HitShape function include:

nil // nothing hit

true // the primitive shape passed was hit

[2,5] // X marks the shape hit in the following array

// shape := [s,s,[s,s,s,s,s,X,s],s,s]

You can retrieve the shape by using the value returned by the HitShape method

as a path expression, as in the following code fragment:

result := HitShape(shape,x,y);

if result then // make sure non-nil

begin

if IsArray(result) then // its an array path

thingHit := shape.(result);

else

thingHit := shape;// its a simple shape

end

Although the expression shape.(result) may look unusual, it is perfectly

legitimate NewtonScript. For further explanation of this syntax, see the “Array

Accessor” discussion in

The NewtonScript Programming Language.

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Apple Newton Utilities Guide de l'utilisateur Page 542

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