Drawing and Graphics

Using the Drawing Interface

viewFormat: nil,
ViewSetupFormScript: func()

begin
// aView is the view to be scaled
self.stepchildren := [aView];
end,

...};

Translating 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.