MACROMEDIA FLASH 8-DEVELOPING FLASH LITE 2.X Instrukcja Użytkownika Pobierz pdf (Strona 4)

Adobe Flash CS3 Classroom in a Book

Lesson 2: Working with Graphics

Lesson 2 uses a sample project to introduce students to

the drawing tools and simple animation. The project is

an animation of a bubbling liquid to be used as a logo

or as a preloader. As they create the preloader, students

learn how to use the Rectangle, Oval, and Line tools;

import a bitmap ﬁll; make selections; group objects;

and manipulate shapes. They also learn about the dif-

ference between drawing modes in Flash.

Flash drawing modes

By default, Flash uses the merge drawing mode when you

draw rectangles, ovals, or lines. In merge drawing mode,

the drawn elements are called shapes. Overlapping shapes

merge together to form a single element on the Stage.

When you select a shape, the selected area appears dotted.

Though the elements merge together, you can select each

separately. Each side of a rectangle’s stroke is a separate

element, for example. To select a shape’s ﬁll and stroke,

drag the Selection tool around the entire shape.

In object drawing mode, active when the Object Draw-

ing icon is selected in the options area of the Tools

panel, rectangles, ovals, and lines are discrete elements,

even when they overlap. The discrete elements are

called drawing objects. When you select a drawing

object, its ﬁll and stroke are both selected.

In primitive drawing mode, active when you use the

Rectangle Primitive or Oval Primitive drawing tools,

drawn elements are discrete objects, but you can

modify their corner angles or inner radius.

Merge drawing mode offers advantages in creating un-

usual, complex shapes. Object drawing mode lets you

move objects without concern that they will change in

relationship to other objects. Primitive drawing mode

makes it possible to draw more complex shapes with-

out having to merge multiple shapes together.

Invite students to draw and manipulate elements us-

ing each of these drawing modes so that they become

familiar with the differences and can recognize them

as they work with them. You can convert a shape to an

object by selecting it and choosing Modify > Combine

Object > Union. You can convert an object to a shape

by selecting it and choosing Modify > Break Apart.

Creating a simple animation

In the lesson, students use a simple motion tween to

animate a bubble so that it moves from the bottom of

the glass to the top, changing size as it does so. You can

also use a Timeline effect to achieve the same result.

Timeline effects provide simple animation options.

To show students an alternative method of animation,

demonstrate the Expand effect. (Choose Insert > Time-

line Effects > Effects > Expand.)

The Expand effect expands, contracts, or expands and

contracts objects over time. This effect works best with

two or more objects grouped together or combined in

a movie clip or graphic symbol. Objects containing text

or letters work well with this effect. You can expand the

duration in frames; expand objects, squeeze them, or

both; expand direction; set fragment offset in pixels;

shift the group center; or change fragment size.

Breaking objects apart

In this lesson, lines were created using the object draw-

ing mode. To delete individual line segments, you need

to break the lines apart, converting them into shapes.

Emphasize for students the difference between shapes

and objects in Flash, and the advantage of shapes when

you want to select shape segments.

Masking objects

A Halloween mask hides what it covers; a graphic mask

reveals what it covers. Students who have used Adobe

Photoshop may already be familiar with masks.

In this lesson, the mask serves to keep the bubbles in the

glass. The bubbles are revealed only where the mask exists,

so they disappear when they reach the top of the glass. By

default, a mask affects only a single layer beneath it, but in

this lesson, students mask multiple layers. In later lessons,

students will also animate masks to change the amount of

an element that is revealed over time.

LESSON 2

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