Contains Area and Shape method
Hi,
I've some problems with the "contains" method of the
Area class in java.awt.geom...the problem is that the boolean value from this method is always false for me..
This is the code for a shape object, but the same is for
an area object. Thank you if you can.
boolean pippo;
Ellipse2D.Float circle2;
circle2 = new Ellipse2D.Float(50,50,50,50);
pippo= circle2.contains(50,50);
System.out.println(pippo);
Did you read the API?
contains:
Tests if the interior of this Ellipse2D entirely
contains the specified rectangular area.
Maybe it has to do with this - as you are specifying a
point that is not interior but on the outside edge??
Therefore it returns false.I'don't think this is the problem...
the istruction:
circle2 = new Ellipse2D.Float(50,50,50,50);
create a circle in position x=50 y=50 with radius=50
and so the coordinate's point (50,50) should be in any case inside the circle!
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< MODERATOR: Message locked. Please read [this|Before you post: Rules of Engagement; before posting next time. use an appropriate subject... something other than what was copied from an email would be appreciated. >
Hi Friends,
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Picture one:
Picture two
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<!-- TemplateBeginEditable name="doctitle" -->
<title>davide marchetti architetto</title>
<!-- TemplateEndEditable -->
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.js"></script>
<link href="ttp://mottie.github.com/tablesorter/css/theme.blue.css" rel="stylesheet">
<script type="text/javascript" src="http://mottie.github.com/tablesorter/js/jquery.tablesorter.js"></script>
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body {
font: 100%/1.4 Verdana, Arial, Helvetica, sans-serif;
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margin: 0;
padding: 0;
color: #000;
background-image: url();
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a:link {
color:#414958;
text-decoration: underline; /* unless you style your links to look extremely unique, it's best to provide underlines for quick visual identification */
a:visited {
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left: 186px;
top: 147px;
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#apDiv2 {
position: relative;
width: 698px;
height: 299px;
z-index: 1;
left: 266px;
top: 117px;
overflow: scroll;
table.tableizer-table {
border: 1px solid #CCC; font-family: Courier New, Courier, monospace;
font-size: 12px;
.tableizer-table td {
padding: 4px;
margin: 3px;
border: 1px solid #ccc;
.tableizer-table th {
background-color: #000000;
color: #FFF;
font-weight: bold;
#apDiv4 {
position: relative;
width: 697px;
height: 299px;
z-index: 1;
left: -141px;
top: -636px;
overflow: scroll;
#apDiv3 {
position: relative;
width: 700px;
height: 300px;
z-index: 2;
h1,h2,h3,h4,h5,h6 {
font-family: "Courier New", Courier, monospace;
</style>
<!-- TemplateBeginEditable name="head" -->
<!-- TemplateEndEditable -->
</head>
<div class="container">
<div class="container"><img src="../images/Davide.png" width="800" height="600" usemap="#Map" border="0" />
<div id="apDiv2">
<map name="Map" id="Map">
<area shape="rect" coords="48,416,125,435" href="../news.html" />
<area shape="rect" coords="262,416,304,436" href="../studio.html" />
<area shape="rect" coords="490,416,545,435" href="../projects.html" />
<area shape="rect" coords="702,415,751,436" href="../contact.html" />
</map>
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<thead>
<tr class="tableizer-firstrow">
<th>YEAR </th>
<th>PROJECT</th>
<th>LOCATION</th>
<th>CATEGORY</th>
<th>STATUS</th>
</tr>
</thead>
<tbody>
<tr>
<td>2013</td>
<td>EXPO 2015 - Italian Pavilion</td>
<td>Milan - Italy</td>
<td>Culture</td>
<td>Competition</td>
</tr>
<tr>
<td>2012</td>
<td>Requalification of "Almerici", "Bufalini" and "Fabbri" Squares</td>
<td>Cesena - Italy</td>
<td>Urban planning</td>
<td>Competition</td>
</tr>
<tr>
<td> </td>
<td>Re-thinking Shanghai: sustainable intervention along the Suzhou Creek</td>
<td>Shanghai - China</td>
<td>Mixed use</td>
<td>Competition</td>
</tr>
<tr>
<td> </td>
<td>VCC Flat</td>
<td>Rome - Italy</td>
<td>Interior design</td>
<td>Commission / Built</td>
</tr>
<tr>
<td>2011</td>
<td>London 2012 Olympic Games Information Pavilion</td>
<td>London - UK</td>
<td>Culture</td>
<td>Competition</td>
</tr>
<tr>
<td> </td>
<td>Enhancement project for the sacred area of the sanctuary of Hercules Victor</td>
<td>Tivoli - Italy</td>
<td>Culture</td>
<td>Competition</td>
</tr>
<tr>
<td>2010</td>
<td>VTL Flat </td>
<td>Rome - Italy</td>
<td>Interior design</td>
<td>Commission / Built</td>
</tr>
<tr>
<td> </td>
<td>BNC Flat</td>
<td>Rome - Italy</td>
<td>Interior design</td>
<td>Commission / Built</td>
</tr>
<tr>
<td> </td>
<td>Expansion of the "Farnesina" High School</td>
<td>Rome - Italy</td>
<td>Education</td>
<td>Competition / Selected Project</td>
</tr>
<tr>
<td> </td>
<td>Neanderthal Art Center</td>
<td>Pilo�a - Spain</td>
<td>Culture</td>
<td>Competition</td>
</tr>
<tr>
<td> </td>
<td>New pedestrian & cycling footpath in the site of the "San Leopoldo II" old bridge</td>
<td>Poggio a Caiano - Italy</td>
<td>Infrastructure</td>
<td>Competition</td>
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<tr>
<td> </td>
<td>Proposition 2065 - St. Leonards site</td>
<td>Sidney - Australia</td>
<td>Mixed use</td>
<td>Competition</td>
</tr>
<tr>
<td> </td>
<td>MEIS - National Museum of Italian Judaism and Shoah </td>
<td>Ferrara - Italy</td>
<td>Culture</td>
<td>Competition / 3rd Prize</td>
</tr>
<tr>
<td> </td>
<td>36 The Calls Design Competition</td>
<td>Leeds - UK</td>
<td>Offices</td>
<td>Competition</td>
</tr>
<tr>
<td> </td>
<td>Europan 10: masterplan for an harbour area</td>
<td>Rudk�bing - Denmark</td>
<td>Urban planning</td>
<td>Competition</td>
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<tr>
<td>2009</td>
<td>"Scuola in Piazza a Levante" - Kindergarten and public areas</td>
<td>Bisceglie - Italy</td>
<td>Education</td>
<td>Competition</td>
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<tr>
<td> </td>
<td>CIBAF - City of Kids </td>
<td>Frattamaggiore - Italy</td>
<td>Education</td>
<td>Competition</td>
</tr>
<tr>
<td> </td>
<td>Designing in Teheran</td>
<td>Teheran - Iran</td>
<td>Mixed use</td>
<td>Competition / Selected Project</td>
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<tr>
<td>2008</td>
<td>DawnTown 2008: Waterworks</td>
<td>Miami - USA</td>
<td>Mixed use</td>
<td>Competition</td>
</tr>
<tr>
<td> </td>
<td>Venice Biennale New Australian Pavillion</td>
<td>Venice - Italy</td>
<td>Culture</td>
<td>Competition / 1st Prize</td>
</tr>
<tr>
<td> </td>
<td>New pedestrian and cycling bridge</td>
<td>Civita di Bagnoregio - Italy</td>
<td>Infrastructure</td>
<td>Competition</td>
</tr>
<tr>
<td> </td>
<td>Renovation of "San Ciro" Square</td>
<td>Portici - Italy</td>
<td>Urban planning</td>
<td>Competition / 2nd phase selected / 3rd Prize</td>
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<tr>
<td> </td>
<td>Renovation of "Umberto I�" Square</td>
<td>San Ferdinando di Puglia - Italy</td>
<td>Urban planning</td>
<td>Competition</td>
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<tr>
<td> </td>
<td>Historic Renovation of the "Corsie Sistine" Hospital Wards </td>
<td>Rome - Italy</td>
<td>Culture</td>
<td>Tender Competition (design/bid/build)</td>
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<tr>
<td> </td>
<td>Cupboard</td>
<td>Rome - Italy</td>
<td>Furniture design</td>
<td>Commission / Built</td>
</tr>
<tr>
<td> </td>
<td>Office table and lighting system</td>
<td>Rome - Italy</td>
<td>Furniture design</td>
<td>Commission / Built</td>
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<tr>
<td> </td>
<td>New City Library</td>
<td>Legnano - Italy</td>
<td>Library</td>
<td>Competition</td>
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<tr>
<td> </td>
<td>Office table</td>
<td>Rome - Italy</td>
<td>Furniture design</td>
<td>Concept Design</td>
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<td> </td>
<td>Volleyball Arena, Hotel and Commercial Spaces</td>
<td>Rome - Italy</td>
<td>Mixed use</td>
<td>Concept Design</td>
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<td>New Provincial Archaeological Museum in the Santa Scolastica Monastery</td>
<td>Bari - Italy</td>
<td>Culture</td>
<td>Competition / 5th Prize</td>
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<td> </td>
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<td>Rome - Italy</td>
<td>Mixed use</td>
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<td> </td>
<td>Parkway Iconic Bridge</td>
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<td>Infrastructure</td>
<td>Competition</td>
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<td>Renovation of "Loveno 84" Sport Center</td>
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<td>New Seafront and Beach Accesses</td>
<td>Fregene - Italy</td>
<td>Urban planning</td>
<td>Competition / Mention</td>
</tr>
<tr>
<td> </td>
<td>Requalification of Main Streets and Squares of the Old City Centre</td>
<td>Bari - Italy</td>
<td>Urban planning</td>
<td>Competition</td>
</tr>
<tr>
<td> </td>
<td>Gyeonggi-do Jeongok Prehistory Museum</td>
<td>Jeongok-ri - South Korea</td>
<td>Culture</td>
<td>Competition / Honourable Mention</td>
</tr>
<tr>
<td> </td>
<td>Low-income housing development</td>
<td>Guadalajara/Ceuta - Spain</td>
<td>Residential</td>
<td>Competition</td>
</tr>
<tr>
<td> </td>
<td>Shop extension</td>
<td>Rome - Italy</td>
<td>Retail</td>
<td>Commission / Concept Design</td>
</tr>
<tr>
<td> </td>
<td>Temporary Concert Hall</td>
<td>Rome - Italy</td>
<td>Culture</td>
<td>Concept Design</td>
</tr>
<tr>
<td> </td>
<td>Office Space Interior Design - New Seat of the Lombardy Regional Government </td>
<td>Milan - Italy</td>
<td>Office</td>
<td>Tender Competition (design/bid/build)</td>
</tr>
<tr>
<td>2005</td>
<td>Europan 8 - Urban Requalification</td>
<td>Istanbul - Turkey</td>
<td>Urban planning</td>
<td>Competition</td>
</tr>
<tr>
<td> </td>
<td>Natural Park Visitor Center, Kindergarten and Primary School</td>
<td>Funes - Italy</td>
<td>Education</td>
<td>Competition</td>
</tr>
<tr>
<td> </td>
<td>Coastal Area Development</td>
<td>Latina - Italy</td>
<td>Urban planning</td>
<td>Competition</td>
</tr>
<tr>
<td> </td>
<td>Requalification of Three Squares</td>
<td>Benevento - Italy</td>
<td>Urban planning</td>
<td>Competition</td>
</tr>
<tr>
<td> </td>
<td>Office and Data Center New Building in the Ministry of Defense headquarters</td>
<td>Rome - Italy</td>
<td>Office</td>
<td>Concept Design</td>
</tr>
<tr>
<td>2004</td>
<td>JCD Floating Pearl Store</td>
<td>Tokio - Japan</td>
<td>Retail</td>
<td>Competition / 2nd phase selected </td>
</tr>
<tr>
<td> </td>
<td>Requalifications of Rome�s Beachfront and Coastal Areas</td>
<td>Ostia - Italy</td>
<td>Urban planning</td>
<td>Competition / 1st Prize</td>
</tr>
<tr>
<td> </td>
<td>40 Apartments Building and Sport Center</td>
<td>Rome - Italy</td>
<td>Mixed use</td>
<td>Competition / 2nd Prize</td>
</tr>
<tr>
<td> </td>
<td>nMBA New Beaux-Art Museum</td>
<td>Lausanne - Switzerland</td>
<td>Culture</td>
<td>Competition</td>
</tr>
<tr>
<td> </td>
<td>The Dubai Residence and Hotel Towers</td>
<td>Dubai - UAE</td>
<td>Mixed use</td>
<td>Concept Design</td>
</tr>
<tr>
<td> </td>
<td>Shoes and Accessories Shop</td>
<td>Rome - Italy</td>
<td>Retail</td>
<td>Commission / Concept Design</td>
</tr>
<tr>
<td>2003</td>
<td>Pedestrian and cycling Bridge </td>
<td>Rome - Italy</td>
<td>Infrastructure</td>
<td>Competition</td>
</tr>
<tr>
<td> </td>
<td>Temporary Pavillion for a Car Show</td>
<td>Rome - Italy</td>
<td>Retail</td>
<td>Commission / Concept Design</td>
</tr>
<tr>
<td> </td>
<td>Belvedere Tower</td>
<td>Castellammare di Stabia - Italy</td>
<td>Infrastructure</td>
<td>Concept Design</td>
</tr>
</tbody>
</table>
</div>
</div>
<!-- end .container --></div>
</body>
</html>#apDiv2 {
position: absolute;
width: 698px;
height: 299px;
z-index: 1;
left:50px;
top: 117px;
overflow: scroll;
Don't forget to fix your code errors. You're still missing a <body> tag in your markup.
Nancy O. -
Overlay Images and Shapes on the same canvas
The example copde below was taken from: http://math.hws.edu/eck/cs124/javanotes3/source/
Is it possible to update the code so that images (jpg,gif) can be added as well as shapes?
Any help with this is much appreciated.
The ShapeDraw applet lets the user add small colored shapes to
a drawing area and then drag them around. The shapes are rectangles,
ovals, and roundrects. The user adds a shape to the canvas by
clicking on a button. The shape is added at the upper left corner
of the canvas. The color of the shape is given by the current
setting of a pop-up menu. The user can drag the shapes with the
mouse. Ordinarily, the shapes maintain a given back-to-front order.
However, if the user shift-clicks on a shape, that shape will be
brought to the front.
A menu can be popped up on a shape (by right-clicking or performing
some othe platform-dependent action). This menu allows the user
to change the size and color of a shape. It is also possible to
delete the shape and to bring it to the front.
This file defines the applet class plus several other classes used
by the applet, namely: ShapeCanvas, Shape, RectShape, OvalShape,
and RoundRectShape.
David Eck
July 28, 1998
import java.awt.*;
import java.awt.event.*;
import java.applet.Applet;
import java.util.Vector;
public class ShapeDrawWithMenu extends Applet {
public void init() {
// Set up the applet's GUI. It consists of a canvas, or drawing area,
// plus a row of controls below the canvas. The controls include three
// buttons which are used to add shapes to the canvas and a Choice menu
// that is used to select the color used for a shape when it is created.
// The canvas is set as the "listener" for these controls so that it can
// respond to the user's actions. (The pop-up menu is created by the canvas.)
setBackground(Color.lightGray);
ShapeCanvas canvas = new ShapeCanvas(); // create the canvas
Choice colorChoice = new Choice(); // color choice menu
colorChoice.add("Red");
colorChoice.add("Green");
colorChoice.add("Blue");
colorChoice.add("Cyan");
colorChoice.add("Magenta");
colorChoice.add("Yellow");
colorChoice.add("Black");
colorChoice.add("White");
colorChoice.addItemListener(canvas);
Button rectButton = new Button("Rect"); // buttons for adding shapes
rectButton.addActionListener(canvas);
Button ovalButton = new Button("Oval");
ovalButton.addActionListener(canvas);
Button roundRectButton = new Button("RoundRect");
roundRectButton.addActionListener(canvas);
Panel bottom = new Panel(); // a Panel to hold the control buttons
bottom.setLayout(new GridLayout(1,4,3,3));
bottom.add(rectButton);
bottom.add(ovalButton);
bottom.add(roundRectButton);
bottom.add(colorChoice);
setLayout(new BorderLayout(3,3));
add("Center",canvas); // add canvas and controls to the applet
add("South",bottom);
public Insets getInsets() {
// Says how much space to leave between the edges of the applet and the
// components in the applet.
return new Insets(3,3,3,3);
} // end class ShapeDraw
class ShapeCanvas extends Canvas implements ActionListener, ItemListener,
MouseListener, MouseMotionListener {
// This class represents a canvas that can display colored shapes and
// let the user drag them around. It uses an off-screen images to
// make the dragging look as smooth as possible. A pop-up menu is
// added to the canvas that can be used to performa certain actions
// on the shapes;
Image offScreenCanvas = null; // off-screen image used for double buffering
Graphics offScreenGraphics; // graphics context for drawing to offScreenCanvas
Vector shapes = new Vector(); // holds a list of the shapes that are displayed on the canvas
Color currentColor = Color.red; // current color; when a shape is created, this is its color
ShapeCanvas() {
// Constructor: set background color to white, set up listeners to respond to mouse actions,
// and set up the pop-up menu
setBackground(Color.white);
addMouseListener(this);
addMouseMotionListener(this);
popup = new PopupMenu();
popup.add("Red");
popup.add("Green");
popup.add("Blue");
popup.add("Cyan");
popup.add("Magenta");
popup.add("Yellow");
popup.add("Black");
popup.add("White");
popup.addSeparator();
popup.add("Big");
popup.add("Medium");
popup.add("Small");
popup.addSeparator();
popup.add("Delete");
popup.add("Bring To Front");
add(popup);
popup.addActionListener(this);
} // end construtor
synchronized public void paint(Graphics g) {
// In the paint method, everything is drawn to an off-screen canvas, and then
// that canvas is copied onto the screen.
makeOffScreenCanvas();
g.drawImage(offScreenCanvas,0,0,this);
public void update(Graphics g) {
// Update method is called when canvas is to be redrawn.
// Just call the paint method.
paint(g);
void makeOffScreenCanvas() {
// Erase the off-screen canvas and redraw all the shapes in the list.
// (First, if canvas has not yet been created, then create it.)
if (offScreenCanvas == null) {
offScreenCanvas = createImage(getSize().width,getSize().height);
offScreenGraphics = offScreenCanvas.getGraphics();
offScreenGraphics.setColor(getBackground());
offScreenGraphics.fillRect(0,0,getSize().width,getSize().height);
int top = shapes.size();
for (int i = 0; i < top; i++) {
Shape s = (Shape)shapes.elementAt(i);
s.draw(offScreenGraphics);
public void itemStateChanged(ItemEvent evt) {
// This is called to respond to item events. Such events
// can only be sent by the color choice menu,
// so respond by setting the current color according to
// the selected item in that menu.
Choice colorChoice = (Choice)evt.getItemSelectable();
switch (colorChoice.getSelectedIndex()) {
case 0: currentColor = Color.red; break;
case 1: currentColor = Color.green; break;
case 2: currentColor = Color.blue; break;
case 3: currentColor = Color.cyan; break;
case 4: currentColor = Color.magenta; break;
case 5: currentColor = Color.yellow; break;
case 6: currentColor = Color.black; break;
case 7: currentColor = Color.white; break;
public void actionPerformed(ActionEvent evt) {
// Called to respond to action events. The three shape-adding
// buttons have been set up to send action events to this canvas.
// Respond by adding the appropriate shape to the canvas. This
// also be a command from a pop-up menu.
String command = evt.getActionCommand();
if (command.equals("Rect"))
addShape(new RectShape());
else if (command.equals("Oval"))
addShape(new OvalShape());
else if (command.equals("RoundRect"))
addShape(new RoundRectShape());
else
doPopupMenuCommand(command);
synchronized void addShape(Shape shape) {
// Add the shape to the canvas, and set its size/position and color.
// The shape is added at the top-left corner, with size 50-by-30.
// Then redraw the canvas to show the newly added shape.
shape.setColor(currentColor);
shape.reshape(3,3,50,30);
shapes.addElement(shape);
repaint();
// ------------ This rest of the class implements dragging and the pop-up menu ---------------------
PopupMenu popup;
Shape selectedShape = null; // This is null unless a menu has been popped up on this shape.
Shape draggedShape = null; // This is null unless a shape has been selected for dragging.
int prevDragX; // During dragging, these record the x and y coordinates of the
int prevDragY; // previous position of the mouse.
Shape clickedShape(int x, int y) {
// Find the frontmost shape at coordinates (x,y); return null if there is none.
for ( int i = shapes.size() - 1; i >= 0; i-- ) { // check shapes from front to back
Shape s = (Shape)shapes.elementAt(i);
if (s.containsPoint(x,y))
return s;
return null;
void doPopupMenuCommand(String command) {
// Handle a command from the pop-up menu.
if (selectedShape == null) // should be impossible
return;
if (command.equals("Red"))
selectedShape.setColor(Color.red);
else if (command.equals("Green"))
selectedShape.setColor(Color.green);
else if (command.equals("Blue"))
selectedShape.setColor(Color.blue);
else if (command.equals("Cyan"))
selectedShape.setColor(Color.cyan);
else if (command.equals("Magenta"))
selectedShape.setColor(Color.magenta);
else if (command.equals("Yellow"))
selectedShape.setColor(Color.yellow);
else if (command.equals("Black"))
selectedShape.setColor(Color.black);
else if (command.equals("White"))
selectedShape.setColor(Color.white);
else if (command.equals("Big"))
selectedShape.resize(75,45);
else if (command.equals("Medium"))
selectedShape.resize(50,30);
else if (command.equals("Small"))
selectedShape.resize(25,15);
else if (command.equals("Delete"))
shapes.removeElement(selectedShape);
else if (command.equals("Bring To Front")) {
shapes.removeElement(selectedShape);
shapes.addElement(selectedShape);
repaint();
synchronized public void mousePressed(MouseEvent evt) {
// User has pressed the mouse. Find the shape that the user has clicked on, if
// any. If there is a shape at the position when the mouse was clicked, then
// start dragging it. If the user was holding down the shift key, then bring
// the dragged shape to the front, in front of all the other shapes.
int x = evt.getX(); // x-coordinate of point where mouse was clicked
int y = evt.getY(); // y-coordinate of point
if (evt.isPopupTrigger()) { // If this is a pop-up menu event that
selectedShape = clickedShape(x,y); // occurred over a shape, record which shape
if (selectedShape != null) // it is and show the menu.
popup.show(this,x,y);
else {
draggedShape = clickedShape(x,y);
if (draggedShape != null) {
prevDragX = x;
prevDragY = y;
if (evt.isShiftDown()) { // Bring the shape to the front by moving it to
shapes.removeElement(draggedShape); // the end of the list of shapes.
shapes.addElement(draggedShape);
repaint(); // repaint canvas to show shape in front of other shapes
synchronized public void mouseDragged(MouseEvent evt) {
// User has moved the mouse. Move the dragged shape by the same amount.
if (draggedShape != null) {
int x = evt.getX();
int y = evt.getY();
draggedShape.moveBy(x - prevDragX, y - prevDragY);
prevDragX = x;
prevDragY = y;
repaint(); // redraw canvas to show shape in new position
synchronized public void mouseReleased(MouseEvent evt) {
// User has released the mouse. Move the dragged shape, then set
// shapeBeingDragged to null to indicate that dragging is over.
// If the shape lies completely outside the canvas, remove it
// from the list of shapes (since there is no way to ever move
// it back onscreen).
int x = evt.getX();
int y = evt.getY();
if (draggedShape != null) {
draggedShape.moveBy(x - prevDragX, y - prevDragY);
if ( draggedShape.left >= getSize().width || draggedShape.top >= getSize().height ||
draggedShape.left + draggedShape.width < 0 ||
draggedShape.top + draggedShape.height < 0 ) { // shape is off-screen
shapes.removeElement(draggedShape); // remove shape from list of shapes
draggedShape = null;
repaint();
else if (evt.isPopupTrigger()) { // If this is a pop-up menu event that
selectedShape = clickedShape(x,y); // occurred over a shape, record the
if (selectedShape != null) // shape and show the menu.
popup.show(this,x,y);
public void mouseEntered(MouseEvent evt) { } // Other methods required for MouseListener and
public void mouseExited(MouseEvent evt) { } // MouseMotionListener interfaces.
public void mouseMoved(MouseEvent evt) { }
public void mouseClicked(MouseEvent evt) { }
} // end class ShapeCanvas
abstract class Shape {
// A class representing shapes that can be displayed on a ShapeCanvas.
// The subclasses of this class represent particular types of shapes.
// When a shape is first constucted, it has height and width zero
// and a default color of white.
int left, top; // Position of top left corner of rectangle that bounds this shape.
int width, height; // Size of the bounding rectangle.
Color color = Color.white; // Color of this shape.
void reshape(int left, int top, int width, int height) {
// Set the position and size of this shape.
this.left = left;
this.top = top;
this.width = width;
this.height = height;
void resize(int width,int height) {
// Set the size without changing the position
this.width = width;
this.height = height;
void moveTo(int x, int y) {
// Move upper left corner to the point (x,y)
this.left = x;
this.top = y;
void moveBy(int dx, int dy) {
// Move the shape by dx pixels horizontally and dy pixels veritcally
// (by changing the position of the top-left corner of the shape).
left += dx;
top += dy;
void setColor(Color color) {
// Set the color of this shape
this.color = color;
boolean containsPoint(int x, int y) {
// Check whether the shape contains the point (x,y).
// By default, this just checks whether (x,y) is inside the
// rectangle that bounds the shape. This method should be
// overridden by a subclass if the default behaviour is not
// appropriate for the subclass.
if (x >= left && x < left+width && y >= top && y < top+height)
return true;
else
return false;
abstract void draw(Graphics g);
// Draw the shape in the graphics context g.
// This must be overriden in any concrete subclass.
} // end of class Shape
class RectShape extends Shape {
// This class represents rectangle shapes.
void draw(Graphics g) {
g.setColor(color);
g.fillRect(left,top,width,height);
g.setColor(Color.black);
g.drawRect(left,top,width,height);
class OvalShape extends Shape {
// This class represents oval shapes.
void draw(Graphics g) {
g.setColor(color);
g.fillOval(left,top,width,height);
g.setColor(Color.black);
g.drawOval(left,top,width,height);
boolean containsPoint(int x, int y) {
// Check whether (x,y) is inside this oval, using the
// mathematical equation of an ellipse.
double rx = width/2.0; // horizontal radius of ellipse
double ry = height/2.0; // vertical radius of ellipse
double cx = left + rx; // x-coord of center of ellipse
double cy = top + ry; // y-coord of center of ellipse
if ( (ry*(x-cx))*(ry*(x-cx)) + (rx*(y-cy))*(rx*(y-cy)) <= rx*rx*ry*ry )
return true;
else
return false;
class RoundRectShape extends Shape {
// This class represents rectangle shapes with rounded corners.
// (Note that it uses the inherited version of the
// containsPoint(x,y) method, even though that is not perfectly
// accurate when (x,y) is near one of the corners.)
void draw(Graphics g) {
g.setColor(color);
g.fillRoundRect(left,top,width,height,width/3,height/3);
g.setColor(Color.black);
g.drawRoundRect(left,top,width,height,width/3,height/3);
}Manveer-Singh
Please don't post in old threads that are long dead. When you have a question, please start a topic of your own. Feel free to provide a link to an old thread if relevant.
I'm locking this 3 year old thread now.
db
edit You have earlier been advised not to post in old dead threads.
[http://forums.sun.com/thread.jspa?threadID=354443]
Continuing to ignore this advice will render your account liable to be blocked.
Edited by: Darryl.Burke -
Does not contain a static 'Main' method suitable for an entry point_
Hello
I want to to do a project with Entiity Framework . I add a project to my solution for my domain class and it's name is 'LinkModel.DomainClasses'. when I prees F5 there is an error like bellow.
Could You help me to solve this? thanks alot
..\Documents\Training\LinkCodeFirstLast\LinkCodeFirst\LinkCodeFirst\LinkModel.DomainClasses\obj\Debug\LinkModel.DomainClasses.exe'
does not contain a static 'Main' method suitable for an entry pointHi bkshn,
This error is caused by the missing "Main" method in your project. it is the entry point of your project.
If you want to create a EF project, you could follow the way in the aricle below.
https://msdn.microsoft.com/en-us/data/ee712907#codefirst
The Main method is like below.
class Program
static void Main(string[] args)
using (var db = new BloggingContext())
// Create and save a new Blog
Console.Write("Enter a name for a new Blog: ");
var name = Console.ReadLine();
var blog = new Blog { Name = name };
db.Blogs.Add(blog);
db.SaveChanges();
// Display all Blogs from the database
var query = from b in db.Blogs
orderby b.Name
select b;
Console.WriteLine("All blogs in the database:");
foreach (var item in query)
Console.WriteLine(item.Name);
Console.WriteLine("Press any key to exit...");
Console.ReadKey();
And you could start to learn the EF from the following MSDN blogs.
https://msdn.microsoft.com/en-us/data/ee712907
If you have any other concern regarding this issue, please feel free to let me know.
Best regards,
Youjun Tang
We are trying to better understand customer views on social support experience, so your participation in this interview project would be greatly appreciated if you have time. Thanks for helping make community forums a great place.
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HERE to participate the survey. -
Multiple dispatch and Symmetric methods - Where Does That Code Live?
Hi all.
I am stuck with the above problem, which looks to be a very common and fundamental one. Supposing I have some sort of relation or operation to be performed on various different pairs (or n-tuples) of classes of object. Where does this code belong, given that it is not sole property of any one of the classes, but a kind of property of the collection of classes?
An bad example for me to bring up, but one that neatly illustrates the point, is the equals method. In order to retain the symmetric and transitive properties of the equals method, and object can only make judgement calls about it being equal to another object of it's own type. This prevents the concept of equivalency from crossing between types.
In order to compare a with b (if a and b are of different types), b must supply some sort of representation of itself as an a, then the comparison statement a.equals(b.asA()); must be called.
This of course means b must supply an 'asXXX()' method for each class XXX it wishes to equate itself to. Furthermore, by an extension of the equals contract for symmetricality, the method AsB() in class A (if it exists) must be such that, if a.AsB() .equals (b), then b.AsA.equals( a ).
This sort of design is unfeasible for obvious reasons, the main reason being that it is impossible to anticipate evey case where an instance of class A could reasonably be compared to an instance of some other class X.
The other annoyance is all that hard work of providing methods to equate A with something else, would go unused for 99% of the time.
With this in mind, I was thinking. Suppose in some program environment, we have only 3 classes, A, B, and C, such that:
{A,B} can be meaningfully compared
{B, C} and {A, C} cannot.
It would be OK to supply code (somewhere) for comparing A's with B's. We also know that under no circumstances will an A or a B, and a C, ever need to be compared for equality.
Supposing an extension of this environment were created, introducing class D.
{D, A} and {D, B} can be meaningfully compared.
Now, neither A nor C knows what a D is, or how to compare themselves to it. But D was developed with A, B and C in mind, and contains logic for the various comparisons (with A and with B). An obvious idea for this is to let D bring it's new code into play, by registering these new comparison functions in the environment somehow.
Supposing instead that equality comparison was delegated to some third party, instead. This third party contains a table of pairs of classes, which act as keys to look up a comparison object.
So, when class A is loaded, something of the sort happens:
public class A {
static {
Equals.comparer.addEntry(A.class, B.class, new EqualsMethod() {
// details of the EqualsMethod interface implementation go here
public class B {
static {
// since equals is symmetric, this method clashes with the above in A
// This could happen...
Equals.comparer.addEntry(B.class, A.class, new EqualsMethod() {
// ... different approach to the above
public class D {
static {
Equals.comparer.addEntry(D.class, A.class, new EqualsMethod() {
Equals.comparer.addEntry(D.class, B.class, new EqualsMethod() {
} // Ds can now be compared with Bs and As. They can now be compared with Ds
}There is a problem with the above. As can clearly be seen, there are 3 unique situations that might occur between two classes (call them X and Y).
o One of X or Y contains code to compare them both.
o Neither X nor Y contain code to compare the two. X equals Y is always false
o Both X and Y contain code to compare the two.
The third causes the problem. What if X and Y disagree on how to compare themselves? Which method gets chosen? The only solution would be to let whosever static initialiser gets called first be the one to supply the code.
I said before that equals was a bad example to bring up. this is because the usage of equals and the concept of equality in java is already well defined, and works just fine. However, in my own pet project at the moment, I have run into the same problems as outlined above.
I am currently assembling a generic pattern API for use in various other applications I am writing (I was finding that I was writing code for matching objects to patterns, in different guises, quite frequently, so I made the decision to refactor it into its own package). An important part of the API is the section that handles the logic for combining patterns, ie with AND, OR and NOT operations.
The Pattern interface is this:
interface Pattern<E> {
public boolean match(E toMatch);
public Pattern<E> not();
public Pattern<E> or(Pattern<E> other);
public Pattern<E> and(Pattern<E> other);
}There are a few basic Patterns:
TruePattern<E> - a pattern that always returns true no matter what E is passed for it toMatch
FalsePattern<E> - self-explanatory.
ExactValuePattern<E> - true if and only if the E that it is passed toMatch is .equal to the E that this pattern was constructed with.
NotPattern<E> - a pattern that contains another pattern, and returns true for any E that returns does not match it's contained pattern. Used for when the contained pattern cannot be logically reduced to one pattern under the NOT method in the Pattern interface
AndPattern<E> - a pattern that contains 2 other patterns, and returns true for some E iff both contained patterns return true for that E. Used for when the 2 patterns cannot be logically reduced into one pattern via the AND method in the Pattern interface
OrPattern<E> - self explanatory
RangePattern<E extends Comparable <E>> - a pattern for comparing if some Comparable lies between two other comparables.
Every pattern has the opportunity to provide a reduction, when combined with another pattern through And or Or. For example, any pattern AND a FalsePattern can be reduced just the FalsePattern. any pattern OR a TruePattern can be reduced to just the TruePattern.
The methods AND and OR from the Pattern interface present the same problems as the .equals() example I was using before.
o AND and OR are symmetric operations
o There exist situations where two patterns of unrelated class could be meaningfully combined (and reduced) under these two operations.
Example: The pattern on Integers '0 < X < 3' and 'X is 5' can be reduce to the FalsePattern
Example: The pattern on Doubles '0 < X <= 10' or 'X is 5.5' or 'X is 7.2' can be reduced to '0 < X <= 10'.
Example: The pattern on Integers ('0 <= X <= 5' and 'X is not 0') or ('X is 6') or ('x is 7') can be reduced to '1<=X<=7'.
So the question is, where does the code belong? a.and(b) should return the same as b.and(a), but both b and a may well disagree as to what happens when they are combined under and. At present, both a and b need to supply their own separate implementations. Clearly though, the code for combining patterns A and B belongs to neither A alone, not B alone, but to A and B as a whole.
Thanks in advance, and sorry for this overlong post.So the equivalent thing in my scenario would be an
AndAnator, and an OrAnator? :)
The thing is, it would be nice for comparison between
A and B to take place automatically, without the poor
coder having to maintain a reference to a Comparator
and invoke the comparison method each time. Likewise
in my situation, it'd be nice to say A.or(B) instead
of andAnator.and(A,B), yet have all the goodness of a
third party doing the comparison (or in this case,
the anding).
I am going to go and test this all out, but do you
have any suggestions on a good structure? I think it
would involve pulling the and/or/not methods from the
interface (this appeals, as many implementors may not
wish to supply logic for running these methods
anyhow), and then putting them... somewhere else.I didn't consider your speicifc problem very deeply because after such a long detailed explanation I figured you'd be up for kicking around the idea for a while.
In your case, I see that you would want to be able to call the and and or methods on the Objects themselves. Luckily, in this case, I think you can have your cake and eat it too.
You can make your and and or methods fa�ades to the third party 'referee'. This way you can enfore symmetry. It's difficult (if not impossible) to enoforce transitivity with this design but I think you don't even need that in this case. That is if a == b and b == c then a == c should be true but if a and b and b and c then a and c is not necessarily true. In your case, it may not even make sense. -
Plain Explain and s methods (tools) for to improve Performance
Hi
How can I do to use Plain Explain and others methods for to impove performance ?
Where can I to find tutorial about it ?
thank you in advanceHi
How can I do to use Plain Explain and others
methods for to impove performance ?
Internally there are potentially several hundred 'procedures' that can be assembled in different ways to access data. For example, when getting one row from a table, you could use an index or a full table scan.
Explain Plan shows the [proposed] access path, or complete list of the procedures, in the order called, to do what the SQL statement is requesting.
The objective with Explain Plan is to review the proposed access path and determine whether alternates, through the use of hints or statistics or indexes or materialized views, might be 'better'.
You often use Wait analysis, through StatsPack, AWR/ADDM, TKProf, Trace, etc. to determine which SQL statement is likely causing a performance issue.
>
Where can I to find tutorial about it ?Ah ... the $64K question. If we only knew ...
There are so many variables involved, that most tutorials are nearly useless. The common approach therefore is to read - a lot. And build up your own 'interpretation' of the reading.
Personal suggestion is to read (in order)
1) Oracle's Database Concepts manual (described some of 'how' this is happening)
2) Oracle's Performance Tuning manual (describes more of 'how' as related to performance and also describes some of the approaches)
3) Tom Kyte's latest book (has a lot of demos and 'proofs' about how specific things work)
4) Don Burleson's Statspack book (shows how to set up and do some basic interpretation)
5) Jonathan's book (how the optimizer works - tough reading, though)
6_ any book by the Oak Table (http://oaktable.net)
Beyond that is any book that contains the words 'Oracle' and 'Performance' in the title or description. BUT ... when reading, use truck-loads, not just grains, of salt.
Verify everything. I have seen an incredible amount of mistakes ... make 'em mysellf all the time, so I tend to recognize them when I see them. Believe nothing unless you have proven it for yourself.. Even then, realize there are exceptions and boundary conditions and ibgs and patches and statistics and CPU and memory and disk speed issues that will change ehat you have proven.
It's not hopeless. But it is a lot of work and effort. And well rewarded, if you decide to get serious.
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