Re: update doesnt´t work ?
From: gzell (gzell_at_gmx.de)
Date: 09/19/04
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Date: 19 Sep 2004 04:52:04 -0700
hmm, did some changes as suggestet but still missing
my further lines ...
//----------------------- class Frame04 ---------
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Frame04 extends JFrame{
Parabeln myC = new Parabeln();
JMenuBar menubar = new JMenuBar();
ActionListener myListener;
JTextField txt01= new JTextField("Please use Option:
'Gerade-Parabel'");
public Frame04(){
getContentPane().setLayout(null);
myC.setBounds(10,10,400,400);
txt01.setBounds(450,10,250,30);
getContentPane().add(myC);
getContentPane().add(txt01);
myListener=new ActionListener(){
public void actionPerformed(ActionEvent e) {
JMenuItem source = (JMenuItem)(e.getSource());
if(source.getText().equals("Gerade-Parabel")){
afg01();
}
if(source.getText().equals("Clear")){
Point myPoint = new Point(200,200);
myC.mpKsystem(myPoint);
}
}};
menubar.add(createFileMenu());
setJMenuBar(menubar);
// getContentPane().add(menubar);
Point myPoint = new Point(200,200);
myC.mpKsystem(myPoint);
}
private void afg01(){
Point p1 = new Point(-10,+5);
Point p2 = new Point(10,-7);
myC.zeichneLinie(p1,p2); //first Line
p1.x=-10; p1.y=0; p2.x=10; p2.y=7;
myC.zeichneLinie(p1,p2); // second Line
p1.x=-50; p1.y=4; p2.x=10; p2.y=-7;
myC.zeichneLinie(p1,p2); //third Line
p1 = new Point(-8,-3);
p2 = new Point(10,3);
myC.zeichneLinie(p1,p2); // fourth Line
p1 = new Point(-3,2);
myC.zeichneParabel(p1);
}
private JMenu createFileMenu()
{
JMenu ret = new JMenu("Aufgaben");
ret.setMnemonic('D');
JMenuItem mi;
mi = new JMenuItem("Gerade-Parabel", 'p');
setCtrlAccelerator(mi, 'P');
mi.addActionListener(myListener);
ret.add(mi);
mi = new JMenuItem("Clear", 'c');
setCtrlAccelerator(mi, 'C');
mi.addActionListener(myListener);
ret.add(mi);
//Separator
ret.addSeparator();
mi = new JMenuItem("Beenden", 'e');
mi.addActionListener(myListener);
ret.add(mi);
return ret;
}
private void setCtrlAccelerator(JMenuItem mi, char acc)
{
KeyStroke ks = KeyStroke.getKeyStroke(
acc, Event.CTRL_MASK
);
mi.setAccelerator(ks);
}
public static void main(String[] args){
Frame04 myF = new Frame04();
myF.setSize(800,500);
myF.setVisible(true);
}
}
//-------------------------- class Parabeln ---------------------
import java.awt.*;
import javax.swing.*;
import java.util.*;
public class Parabeln extends JPanel{
boolean ksystem=false;
boolean bGeradezeichnen = false;
boolean bParabelzeichnen = false;
boolean zeichne = false;
Image offScreenImage;
Graphics offScreenGraphics;
int mpx, mpy;
int xS,yS;
Color f;
Point pkt1 = new Point(0,0);
Point pkt2 = new Point(0,0);
ArrayList aLines = new ArrayList();
public void paintComponent(Graphics g){
if(offScreenImage==null){
offScreenImage =
createImage(this.getSize().width,this.getSize().height);
offScreenGraphics = offScreenImage.getGraphics();
}
if (ksystem) {
offScreenGraphics.setColor(new Color(150,150,150));
offScreenGraphics.fillRect(0,0,this.getSize().width,
this.getSize().height );
koordinatensystem(offScreenGraphics);
ksystem=false;
}
if (bGeradezeichnen) {
addLine(offScreenGraphics);
bGeradezeichnen=false;
}
if (bParabelzeichnen) {
myParabel(offScreenGraphics);
bParabelzeichnen=false;
}
g.drawImage(offScreenImage,0,0,this);
}
public void mpKsystem(Point p){
mpx=p.x; mpy=p.y;
ksystem=true;
repaint();
}
private void ksystemgrid(Graphics h){
Color grid = new Color(199,199,199);
h.setColor(grid);
for(int i=1;i<20;i++) h.drawLine(20*i,0,20*i,400);
for(int i=1;i<20;i++) h.drawLine(0,20*i,400,20*i);
}
private void koordinatensystem(Graphics h){
ksystemgrid(h);
h.setColor(Color.black);
h.drawLine(0,mpy,400,mpy);
h.drawLine(mpx,0,mpx,400);
}
private void addLine(Graphics h){
int k=0;
h.setColor(new Color(255,0,0));
while(k<aLines.size()){
pkt1=(Point)aLines.get(k); // 01 23 45 67
pkt2=(Point)aLines.get(k+1);
h.drawLine(pkt1.x+10,pkt1.y+10,pkt2.x+10,pkt2.y+10);
k=k+2;
}
}
private void myParabel(Graphics h){
int i = 0;
double x[] = new double[80];
double y[] = new double[80];
int px[] = new int[60];
int py[] = new int[60];
while(i<60){
// Punktepaare ermitteln
x[i]=(xS-3)+0.1*i;
y[i]= (x[i]-xS)*(x[i]-xS)+yS;
//in Bildschirmkoordinaten umrechnen
x[i]=(x[i]+10)*20;
if (y[i]>0) y[i]=(10-y[i])*20;
else y[i]=(y[i]*(-1)+10)*20;
// in Integerwerte umwandeln
px[i] = (int)x[i];
py[i] = (int)y[i];
i++;
}
h.setColor(new Color(0,0,255));
h.drawPolyline(px,py,60);
repaint();
}
public void zeichneLinie(Point p1, Point p2){
//umrechnen der Punkte in Bildschirmkoordinaten
pkt1.x=(p1.x+10)*20;
if (p1.y>0) pkt1.y=(10-p1.y)*20;
else pkt1.y=(p1.y*(-1)+10)*20;
pkt2.x=(p2.x+10)*20;
if (p2.y>0) pkt2.y=(10-p2.y)*20;
else pkt2.y=(p2.y*(-1)+10)*20;
aLines.add(pkt1);
aLines.add(pkt2);
bGeradezeichnen=true;
}
public void zeichneParabel(Point p1){
xS=p1.x; yS=p1.y;
bParabelzeichnen=true;
}
}
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- In reply to: Babu Kalakrishnan: "Re: update doesnt´t work ?"
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