The Design and Implementation of Multimedia Software
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1 Chapter 7 A Static Visual Content System The Design and Implementation of Multimedia Software David Bernstein Jones and Bartlett Publishers David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 1 / 56
2 Introduction About this Chapter Consider a comic book character that has one BufferedImage as its head and another as its body: One could create two sampled.content objects and put them in one Visualization. But the character could not be treated as a coherent whole. Consider an illustration of a house using described content in which the door and roof must be different colors: One could create a described.content object for each part of the house and add them all to a single Visualization. Butthehousecouldnotbetreatedasacoherentwhole. David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 2 / 56
3 Introduction Requirements F7.1 Support visual content that has multiple component parts. David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 3 / 56
4 Design Alternatives Ignoring Content Types What s Next We need to consider some high-level design alternatives. David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 4 / 56
5 Design Alternatives Ignoring Content Types A Top-Down Approach 1. Consider design alternatives at a high level of abstraction. Ignore the differences between statik.sampled.content and statik.described.content objects and consider only statik.content objects. 2. Add the details needed to support the differences between statik.sampled.content and statik.described.content. David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 5 / 56
6 Design Alternatives Ignoring Content Types Alternative 1 David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 6 / 56
7 Design Alternatives Ignoring Content Types Alternative 1 - Shortcomings What are the shortcomings? David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 7 / 56
8 Design Alternatives Ignoring Content Types Alternative 1 - Shortcomings Both the Visualization and VisualizationView classes must now distinguish between Content objects and AggregateContent objects making them more complicated, more repetitive, and less cohesive. David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 7 / 56
9 Design Alternatives Ignoring Content Types Alternative 2 Use the Composite Pattern David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 8 / 56
10 Design Alternatives Ignoring Content Types Alternative 2 - Advantages Allows both the Visualization and VisualizationView classes to treat SimpleContent objects and CompositeContent objects in exactly the same way. Enables the creation of content that is very complicated. David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 9 / 56
11 Design Alternatives Incorporating Content Types What s Next We need to consider some lower-level design alternatives. David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 10 / 56
12 Design Alternatives Incorporating Content Types Alternative 2.1 Approach: Make three copies of the design, one for statik.sampled.content, one for statik.described.content, and one for either/both. Shortcomings: What are the shortcomings? David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 11 / 56
13 Design Alternatives Incorporating Content Types Alternative 2.1 Approach: Make three copies of the design, one for statik.sampled.content, one for statik.described.content, and one for either/both. Shortcomings: The statik.sampled.compositecontent, statik.described.compositecontent, and statik.compositecontent classes all must have add(), remove(), render(), andgetbounds2d() methods that contain (virtually) identical code. David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 11 / 56
14 Design Alternatives Incorporating Content Types Alternative 2.2 What are the shortcomings? David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 12 / 56
15 Design Alternatives Incorporating Content Types Alternative 2.2 It doesn t allow operations that are either specific to statik.sampled.content or statik.described.content objects to be applied to statik.compositecontent objects. David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 12 / 56
16 Design Alternatives Incorporating Content Types Alternative 2.3 David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 13 / 56
17 Design Alternatives Incorporating Content Types Alternative Advantages and Disadvantages Advantage: Allows for operations that are specific to statik.sampled.content and statik.described.content Eliminates code duplication by moving the common code to the abstract parent. Disadvantage: Since the abstract parent manages the collection, the collection must contain statik.transformablecontent objects, rather than the more specific statik.sampled.content and statik.described.content objects. David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 14 / 56
18 Design Alternatives Incorporating Content Types Alternative 2.4 David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 15 / 56
19 Design Alternatives Incorporating Content Types The visual.statik Package AbstractAggregateContent - Structure package visual.statik; import java.awt.*; import java.awt.geom.*; import java.util.*; public abstract class AbstractAggregateContent<C extends TransformableContent> extends AbstractTransformableContent // A LinkedList is used to order the components. // Since we don t expect many components to be removed // this doesn t raise efficiency concerns. // // Alternatively, we could have a z-order. protected LinkedList<C> components; public AbstractAggregateContent() super(); components = new LinkedList<C>(); David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 16 / 56
20 Design Alternatives Incorporating Content Types The visual.statik Package AbstractAggregateContent - Content Management public void add(c component) components.add(component); public Iterator<C> iterator() return components.iterator(); public void remove(c component) components.remove(component); David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 17 / 56
21 Design Alternatives Incorporating Content Types The visual.statik Package AbstractAggregateContent - Rendering public void render(graphics g) Iterator<C> i; C component; i = components.iterator(); while (i.hasnext()) component = i.next(); component.setlocation(x, y); component.setrotation(angle, xrotation, yrotation); component.setscale(xscale, yscale); component.render(g); David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 18 / 56
22 Design Alternatives Incorporating Content Types The visual.statik Package AbstractAggregateContent - Bounds public Rectangle2D getbounds2d(boolean oftransformed) double maxx, maxy, minx, miny, rx, ry; Iterator<C> i; Rectangle2D bounds; TransformableContent component; maxx = Double.NEGATIVE_INFINITY; maxy = Double.NEGATIVE_INFINITY; minx = Double.POSITIVE_INFINITY; miny = Double.POSITIVE_INFINITY; i = components.iterator(); while (i.hasnext()) component = i.next(); bounds = component.getbounds2d(oftransformed); if (bounds!= null) rx = bounds.getx(); ry = bounds.gety(); if (rx < minx) minx = rx; if (ry < miny) miny = ry; rx = bounds.getx() + bounds.getwidth(); ry = bounds.gety() + bounds.getheight(); David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 19 / 56
23 Design Alternatives Incorporating Content Types The visual.statik Package AbstractAggregateContent - Bounds (cont.) if (rx > maxx) maxx = rx; if (ry > maxy) maxy = ry; // Note: We could, instead, use an object pool return new Rectangle2D.Double(minX, miny, maxx-minx, maxy-miny); For simplicity, this implementation does not store bounds, it calculates them when needed using the getbounds2d() method in the TransformableContent objects. Alternatively, this class could calculate the bounds whenever they change. David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 20 / 56
24 Design Alternatives Incorporating Content Types The visual.statik Package CompositeContent package visual.statik; public class CompositeContent extends AbstractAggregateContent<TransformableContent> implements TransformableContent public CompositeContent() super(); David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 21 / 56
25 Design Alternatives Incorporating Content Types The visual.statik.sampled Package CompositeContent - Structure package visual.statik.sampled; import java.awt.composite; import java.awt.image.bufferedimageop; import java.util.iterator; import visual.statik.abstractaggregatecontent; public class CompositeContent extends AbstractAggregateContent<TransformableContent> implements TransformableContent public CompositeContent() super(); David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 22 / 56
26 Design Alternatives Incorporating Content Types The visual.statik.sampled Package CompositeContent - setbufferedimageop() public void setbufferedimageop(bufferedimageop op) Iterator<TransformableContent> i; i = iterator(); while (i.hasnext()) i.next().setbufferedimageop(op); David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 23 / 56
27 Design Alternatives Incorporating Content Types The visual.statik.sampled Package CompositeContent - setcomposite() public void setcomposite(composite c) Iterator<TransformableContent> i; i = iterator(); while (i.hasnext()) i.next().setcomposite(c); David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 24 / 56
28 Design Alternatives Incorporating Content Types The visual.statik.described Package CompositeContent - Structure package visual.statik.described; import java.awt.*; import java.util.iterator; import visual.statik.abstractaggregatecontent; public class CompositeContent extends AbstractAggregateContent<TransformableContent> implements TransformableContent public CompositeContent() super(); David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 25 / 56
29 Design Alternatives Incorporating Content Types The visual.statik.described Package CompositeContent - setcolor() public void setcolor(color color) Iterator<TransformableContent> i; i = iterator(); while (i.hasnext()) i.next().setcolor(color); David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 26 / 56
30 Design Alternatives Incorporating Content Types The visual.statik.described Package CompositeContent - setpaint() public void setpaint(paint paint) Iterator<TransformableContent> i; i = iterator(); while (i.hasnext()) i.next().setpaint(paint); David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 27 / 56
31 Design Alternatives Incorporating Content Types The visual.statik.described Package CompositeContent - setstroke() public void setstroke(stroke stroke) Iterator<TransformableContent> i; i = iterator(); while (i.hasnext()) i.next().setstroke(stroke); David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 28 / 56
32 Some Examples What s Next We need to consider some examples. David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 29 / 56
33 Some Examples An Example of described.compositecontent Introducing Buzzy David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 30 / 56
34 Some Examples An Example of described.compositecontent Introducing Buzzy Demonstration In examples/chapter: Buzzy.html java -cp Buzzy.jar BuzzyApplication David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 31 / 56
35 Some Examples An Example of described.compositecontent Buzzy - Structure import java.awt.*; import java.awt.geom.*; import javax.swing.*; import visual.statik.described.*; public class BoringBuzzy extends CompositeContent David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 32 / 56
36 Some Examples An Example of described.compositecontent Buzzy - Constructor public BoringBuzzy() super(); Arc2D.Float BasicStroke Color CompositeContent Content Path2D.Float QuadCurve2D.Float helmetshape, visorshape; stroke; black, gold, gray, purple; head; body, hair, helmet, visor; bodyshape; hairshape; black = Color.BLACK; gold = new Color(0xc2,0xa1,0x4d); gray = new Color(0xaa,0xaa,0xaa); purple = new Color(0x45,0x00,0x84); stroke = new BasicStroke(); David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 33 / 56
37 Some Examples An Example of described.compositecontent Buzzy - Body bodyshape = new Path2D.Float(); bodyshape.moveto( 20, 50); bodyshape.lineto( 20, 70); bodyshape.lineto( 20, 90); bodyshape.lineto( 10, 90); bodyshape.lineto( 10,100); bodyshape.lineto( 80,100); bodyshape.lineto( 80, 90); bodyshape.lineto( 40, 90); bodyshape.lineto( 40, 70); bodyshape.lineto( 40, 50); bodyshape.closepath(); body = new Content(bodyShape, black, purple, stroke); add(body); David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 34 / 56
38 Some Examples An Example of described.compositecontent Buzzy - Head head = new CompositeContent(); add(head); David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 35 / 56
39 Some Examples An Example of described.compositecontent Buzzy - Hair (?) hairshape = new QuadCurve2D.Float(10,2,40,10,30,25); hair = new Content(hairShape, purple, null, stroke); head.add(hair); David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 36 / 56
40 Some Examples An Example of described.compositecontent Buzzy - Helmet helmetshape = new Arc2D.Float(2,20,70,40,2,360,Arc2D.OPEN); helmet=new Content(helmetShape, black, gold, stroke); head.add(helmet); David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 37 / 56
41 Some Examples An Example of described.compositecontent Buzzy - Visor visorshape = new Arc2D.Float(40,25,35,30,315,90,Arc2D.PIE); visor=new Content(visorShape, black, gray, stroke); head.add(visor); David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 38 / 56
42 Some Examples An Example of Mixed CompositeContent Buzzy with a Fancy Helmet David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 39 / 56
43 Some Examples An Example of Mixed CompositeContent Buzzy with a Fancy Helmet - Structure import java.awt.*; import java.awt.geom.*; import javax.swing.*; import io.*; public class FancyBuzzy extends visual.statik.compositecontent David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 40 / 56
44 Some Examples An Example of Mixed CompositeContent Buzzy with a Fancy Helmet - Declarations ResourceFinder visual.statik.compositecontent visual.statik.described.content visual.statik.sampled.content visual.statik.sampled.contentfactory finder; head; body, hair, helmet, visor; screw; factory; David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 41 / 56
45 Some Examples An Example of Mixed CompositeContent Buzzy with a Fancy Helmet - Logo finder = ResourceFinder.createInstance(this); factory = new visual.statik.sampled.contentfactory(finder); screw = factory.createcontent("screw.png", 4); David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 42 / 56
46 Some Examples An Example of Mixed CompositeContent Buzzy with a Fancy Helmet - Head head = new visual.statik.compositecontent(); head.add(hair); head.add(helmet); head.add(screw); head.add(visor); add(head); David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 43 / 56
47 Some Examples An Example of a Visualization Buzzy in the Woods David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 44 / 56
48 Some Examples An Example of a Visualization Buzzy in the Woods Demonstration In examples/chapter: Visualization.html java -cp Visualization.jar VisualizationApplication David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 45 / 56
49 Some Examples An Example of a Visualization Buzzy in the Woods - The Woods finder = ResourceFinder.createInstance(this); factory = new ContentFactory(finder); opfactory = BufferedImageOpFactory.createFactory(); woods = factory.createcontent("woods.png", 3); woods.setlocation(0,0); woods.setbufferedimageop(opfactory.createblurop(3)); David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 46 / 56
50 Some Examples An Example of a Visualization Buzzy in the Woods - Buzzy buzzy = new FancyBuzzy(); buzzy.setlocation(200, 318); David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 47 / 56
51 Some Examples An Example of a Visualization Buzzy in the Woods - The Visualization visualization = new Visualization(); view = visualization.getview(); view.setbounds(0,0,471,418); view.setsize(471,418); visualization.add(woods); visualization.add(buzzy); David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 48 / 56
52 Some Examples An Example of a Visualization Buzzy in the Woods - The Content Pane // The content pane contentpane = (JPanel)rootPaneContainer.getContentPane(); contentpane.add(view); David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 49 / 56
53 Some Examples An Example of Multiple Visualizations Picture-in-a-Picture David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 50 / 56
54 Some Examples An Example of Multiple Visualizations Picture-in-a-Picture Demonstration In examples/chapter: StaticPIP.html java -cp StaticPIP.jar StaticPIPApplication David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 51 / 56
55 Some Examples An Example of Multiple Visualizations Picture-in-a-Picture - Structure import java.awt.*; import java.awt.geom.*; import javax.swing.*; import app.*; import io.*; import visual.*; import visual.statik.sampled.*; public class StaticPIPApp extends AbstractMultimediaApp public void init() BufferedImageOpFactory opfactory; Content woods, house; ContentFactory factory; FancyBuzzy buzzy; JPanel contentpane; ResourceFinder finder; Visualization model1, model2; VisualizationRenderer renderer1, renderer2; VisualizationView view1, view2; finder = ResourceFinder.createInstance(this); factory = new ContentFactory(finder); opfactory = BufferedImageOpFactory.createFactory(); David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 52 / 56
56 Some Examples An Example of Multiple Visualizations Picture-in-a-Picture - Structure (cont.) David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 53 / 56
57 Some Examples An Example of Multiple Visualizations Picture-in-a-Picture - One Visualization woods = factory.createcontent("woods.png", 3); woods.setlocation(0,0); woods.setbufferedimageop(opfactory.createblurop(3)); buzzy = new FancyBuzzy(); buzzy.setlocation(200, 318); model1 = new Visualization(); model1.add(woods); model1.add(buzzy); view1 = model1.getview(); renderer1 = view1.getrenderer(); view1.setrenderer(new ScaledVisualizationRenderer(renderer1, 471.0, 418.0)); view1.setbounds(0,0,471,418); view1.setsize(471,418); David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 54 / 56
58 Some Examples An Example of Multiple Visualizations Picture-in-a-Picture - The Other Visualization house = factory.createcontent("house.png", 3); house.setlocation(0,0); model2 = new Visualization(); model2.add(house); view2 = model2.getview(); renderer2 = view2.getrenderer(); view2.setrenderer(new ScaledVisualizationRenderer(renderer2, 525.0, 375.0)); view2.setbounds(50,50,160,120); view2.setsize(160,120); David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 55 / 56
59 Some Examples An Example of Multiple Visualizations Picture-in-a-Picture - The Content Pane // The content pane contentpane = (JPanel)rootPaneContainer.getContentPane(); contentpane.add(view2); contentpane.add(view1); David Bernstein (jbpub.com) Multimedia Software Jones and Bartlett 56 / 56
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