Re: adding event handling to shapes

Question

Hi
I am trying to make the shapes clickable. I have tried to implement the MouseInputAdapter. I am not sure if I am doing it right. Hope some one will help me in this matter. I ahve attached both shape class and class implementing MouseInput adapter. The shape is called from yet another class that extends canvas.
package Drawing2d;
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.awt.geom.AffineTransform;
import java.awt.geom.Line2D;
import java.awt.geom.Point2D;
import java.util.ArrayList;
import java.util.List;
import javax.swing.event.MouseInputAdapter;
import save.pointList;
* @author venkat
public class Line extends Sketch implements MouseListener,MouseMotionListener{
    //public Point2D[][] lineEndPoints = new Point2D[10][2];
int i = 0;
public pointList plist = new pointList();  
public List lineList;
public Graphics2D g2d;
public Line(Graphics2D g2,int x0, int y0, int x1, int y1){
    lineList = new ArrayList();
    g2.setColor(Color.WHITE);
    g2d = g2;
    float[] dashPattern = { 0,0,0,0 };
    g2.setStroke(new BasicStroke(1));
    AffineTransform at = AffineTransform.getTranslateInstance(Sketch.HEIGHT/2,Sketch.WIDTH/2);
    Line2D.Double line = new Line2D.Double((double)x0,(double)y0,(double)x1,(double)y1);
    g2.draw(at.createTransformedShape(line));
    lineList.add(this);
    Point2D newLoc = at.transform(line.getBounds().getLocation(), null);
    Point p1 =  new Point(g2 ,x0, y0);
    Point p2 =  new Point(g2 ,x1, y1);
    plist.add(x0, y0);
    plist.add(x1, y1);
    LineSelect lineS = new LineSelect(this);
    addMouseListener(lineS);
    addMouseMotionListener(lineS);
* LineSelect.java
* Created on 11-Dec-2007, 16:07:50
* To change this template, choose Tools | Templates
* and open the template in the editor.
package Drawing2d;
import java.awt.Color;
import java.awt.event.MouseEvent;
import java.awt.geom.Line2D;
import java.awt.geom.Point2D;
import javax.swing.event.MouseInputAdapter;
* @author venkat
class LineSelect extends MouseInputAdapter{
    Line selectedLine;
    Line line2d;
    Point2D.Double p;
    public LineSelect(Line line){
        selectedLine = line;
        p = new Point2D.Double();
    public void mouseClicked(MouseEvent e) {
        java.awt.Point p = e.getPoint();      
    for(int j = 0; j < selectedLine.lineList.size(); j++)
            line2d = (Line)selectedLine.lineList.get(j);
            if(line2d.contains(p))
                selectedLine.g2d.setColor(Color.MAGENTA);              
    public void mouseDragged(MouseEvent e) {
    public void mouseEntered(MouseEvent e) {
    public void mouseExited(MouseEvent e) {
    public void mouseMoved(MouseEvent e) {
    public void mousePressed(MouseEvent e) {
    public void mouseReleased(MouseEvent e) {
}

Answer 1

pushinglimits wrote:
Hi
I am trying to make the shapes clickable. I have tried to implement the MouseInputAdapter. I am not sure if I am doing it right. Hope some one will help me in this matter. I ahve attached both shape class and class implementing MouseInput adapter. The shape is called from yet another class that extends canvas.
package Drawing2d;
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.awt.geom.AffineTransform;
import java.awt.geom.Line2D;
import java.awt.geom.Point2D;
import java.util.ArrayList;
import java.util.List;
import javax.swing.event.MouseInputAdapter;
import save.pointList;
* @author venkat
public class Line extends Sketch implements MouseListener,MouseMotionListener{
//public Point2D[][] lineEndPoints = new Point2D[10][2];
int i = 0;
public pointList plist = new pointList();  
public List lineList;
public Graphics2D g2d;
public Line(Graphics2D g2,int x0, int y0, int x1, int y1){
lineList = new ArrayList();
g2.setColor(Color.WHITE);
g2d = g2;
float[] dashPattern = { 0,0,0,0 };
g2.setStroke(new BasicStroke(1));
AffineTransform at = AffineTransform.getTranslateInstance(Sketch.HEIGHT/2,Sketch.WIDTH/2);
Line2D.Double line = new Line2D.Double((double)x0,(double)y0,(double)x1,(double)y1);
g2.draw(at.createTransformedShape(line));
lineList.add(this);
Point2D newLoc = at.transform(line.getBounds().getLocation(), null);
Point p1 =  new Point(g2 ,x0, y0);
Point p2 =  new Point(g2 ,x1, y1);
plist.add(x0, y0);
plist.add(x1, y1);
LineSelect lineS = new LineSelect(this);
addMouseListener(lineS);
addMouseMotionListener(lineS);
* LineSelect.java
* Created on 11-Dec-2007, 16:07:50
* To change this template, choose Tools | Templates
* and open the template in the editor.
package Drawing2d;
import java.awt.Color;
import java.awt.event.MouseEvent;
import java.awt.geom.Line2D;
import java.awt.geom.Point2D;
import javax.swing.event.MouseInputAdapter;
* @author venkat
class LineSelect extends MouseInputAdapter{
Line selectedLine;
Line line2d;
Point2D.Double p;
public LineSelect(Line line){
selectedLine = line;
p = new Point2D.Double();
public void mouseClicked(MouseEvent e) {
java.awt.Point p = e.getPoint();      
for(int j = 0; j < selectedLine.lineList.size(); j++)
line2d = (Line)selectedLine.lineList.get(j);
if(line2d.contains(p))
selectedLine.g2d.setColor(Color.MAGENTA);              
public void mouseDragged(MouseEvent e) {
public void mouseEntered(MouseEvent e) {
public void mouseExited(MouseEvent e) {
public void mouseMoved(MouseEvent e) {
public void mousePressed(MouseEvent e) {
public void mouseReleased(MouseEvent e) {
Hi I appreciate if anybody attempted to answer. I got arounf th problem. here is how
* LineSelect.java
* Created on 11-Dec-2007, 16:07:50
* To change this template, choose Tools | Templates
* and open the template in the editor.
package Drawing2d;
import java.awt.Shape;
import java.awt.Stroke;
import java.awt.event.MouseEvent;
import java.awt.geom.PathIterator;
import java.util.ArrayList;
import javax.swing.event.MouseInputAdapter;
* @author venkat
class LineSelect extends MouseInputAdapter{
    Line selectedLine;
    Line line2d;
    java.awt.Point p;
    Sketch sk;
    Circle circle;
    Shape line;
    Shape shape;
    private Stroke stroke;
    public LineSelect(Sketch s){
        sk = s;
    public void mouseClicked(MouseEvent e) {
        p = e.getPoint();
        PathIterator pi;       
        boolean haveSelection = false;
        ArrayList list = sk.circleList;
        for(int j = 0; j < list.size(); j++)
            circle = (Circle)list.get(j);
            System.out.print(circle.intersects(p.x, p.y, 1, 1));
            pi = circle.getPathIterator(null);
            double[] coords = new double[6];           
            if(circle.intersects(p.x, p.y, 1, 1))
               System.out.print("reached here");
                while(!pi.isDone()){
                pi.currentSegment(coords);
                System.out.print(coords);
                pi.next();
        list = sk.lineList;       
        if(!sk.p.equals("n") && list != null){
            for(int j = 0; j < list.size(); j++)       
           // line = (Line)list.get(j);           
            line = stroke.createStrokedShape((Shape) list.get(j));
                if(line.contains(p))
                    System.out.print("reached mouse pressed");
    public void mouseDragged(MouseEvent e) {
    public void mouseEntered(MouseEvent e) {
        p = e.getPoint();
        ArrayList list;
        list = sk.circleList;
        for(int j = 0; j < list.size(); j++)
            circle = (Circle) list.get(j);           
                   if(circle.contains(p))           
                        System.out.print("reached mouse entered");           
        list = sk.lineList;
        if(!sk.p.equals("n") && list != null){
            for(int j = 0; j < list.size(); j++)       
                line = stroke.createStrokedShape((Circle) list.get(j));
                if(line.contains(p))
                    System.out.print("reached mouse pressed");
    public void mouseExited(MouseEvent e) {
    public void mouseMoved(MouseEvent e) {
    public void mousePressed(MouseEvent e) {
    public void mouseReleased(MouseEvent e) {
public class Sketch extends Canvas implements MouseListener, MouseMotionListener{
    int oldMousePositionx,oldMousePositiony, newMousePositionx, newMousePositiony;
    public String p = new String();
    Color mainColor = Color.WHITE;   
    public Save sav;
    String fileName, fileLocation;
    final int Originx = this.getWidth()/2;
    final int Originy = this.getHeight()/2;
    pointList pList = new pointList();
    pointList cList = new pointList();
    pointList rList = new pointList();
    Graphics2D g2;
    AffineTransform at = new AffineTransform();
    //intBuffer lineBuffer = new intBuffer();
    int i = 0;
    Line line;
    Circle circle;
    Rectangle rec;
    boolean islinereleased;
    boolean iscirclereleased;
    boolean isrectreleased;
    ArrayList<Shape> lineList = new ArrayList<Shape>();
    ArrayList<Circle> circleList = new ArrayList<Circle>();
    ArrayList<Shape> rectList = new ArrayList<Shape>();
    Frame fram;
     "LineSelect lineselect = new LineSelect( this );"
public void newSketch(Frame frame, String fileN, String fileL) {
    fram = frame;
    fileName = fileN.concat(".obj");
    fileLocation = fileL.concat(".obj");
    this.setSize(frame.getSize());
    this.setBackground(Color.BLACK);
    frame.add(this,BorderLayout.CENTER);
    File file = new File(fileLocation,fileName);
    sav = new Save(fileName,fileLocation);
    addMouseListener(lineselect);
    addMouseMotionListener(lineselect);
}This is just my implementation of various posts on the forum. But might give a different perspective.