Ciao a tutti,
qualcuno puo' dirmi cosa c'é che non va in questo listato visto
che quando lo compilo con javac mi da il seguente errore .
DrawingPanel.java:133: 'class' or'interface'expected
import java.awt.*;
ecco il listato :
import java.awt.*;
public class DrawingPanel extends Panel{
private static int SHAPE_WIDTH =75;
private static int SHAPE_HEIGHT =75;
private static int COLUMN_SPACE_WIDTH =20;
private static int ROW_SPACE_HEIGHT =120;
private static Font F1 = new Font("Monospaced",Font.PLAIN,14);
public static int PANEL_WIDTH = 420;
public static int PANEL_HEIGHT= 400;
public DrawingPanel(){
super();
}
public void paint(Graphics g){
int y;
g.setColor(Color.red);
y=20;
y=drawUnfilledShapes(g,y);
y +=ROW_SPACE_HEIGHT;
y=drawFilledShapes(g,y);
y +=ROW_SPACE_HEIGHT;
y=drawOtherShapes(g,y);
}
private int drawUnfilledShapes(Graphics g,int y){
int pentagonXs[]=new int [5];
int pentagonYs[]=new int [5];
int x=20;
g.drawArc(x,y, SHAPE_WIDTH,SHAPE_HEIGHT, 0, 90);
centerText(g,"drawArc",(x + SHAPE_WIDTH/2),Y + SHAPE_HEIGHT,F1);
x=x + SHAPE_WIDTH +COLUMN_SPACE_WIDTH;
g.drawOval(x,y,SHAPE_WIDTH,SHAPE_HEIGHT);
centerText(g,"drawOval",(x+SHAPE_WIDTH/2),y+SHAPE_HEIGHT,F1);
x=x+SHAPE_WIDTH+COLUMN_SPACE_WIDTH;
g.drawRect(x,y,SHAPE_WIDTH,SHAPE_HEIGHT);
centerText(g,"drawRect",(x+SHAPE_WIDTH/2),y+SHAPE_HEIGHT,F1);
x=x+SHAPE_WIDTH+COLUMN_SPACE_WIDTH;
g.drawRoundRect(x,y,SHAPE_WIDTH,SHAPE_HEIGHT,15,15 );
centerText(g,"drawRoundRect",x+SHAPE_WIDTH/2,y+SHAPE_HEIGHT,F1);
x=x+SHAPE_WIDTH+COLUMN_SPACE_WIDTH;
return y;
}
private int drawFilledShapes(Graphics g, int y){
int pentagonXs[]=new int[5];
int pentagonYs[]=new int[5];
int x=20;
g.fillArc(x,y , SHAPE_WIDTH, SHAPE_HEIGHT, 0, 90);
centerText(g,"fillArc",(x+SHAPE_WIDTH/2), y+SHAPE_HEIGHT,F1);
x=x + SHAPE_WIDTH+COLUMN_SPACE_WIDTH;
g.fillOval(x,y, SHAPE_WIDTH,SHAPE_HEIGHT);
centerText(g,"fillOval",(x + SHAPE_WIDTH/2), y + SHAPE_HEIGHT,F1);
x= x + SHAPE_WIDTH + COLUMN_SPACE_WIDTH;
g.fillRect(x,y, SHAPE_WIDTH,SHAPE_HEIGHT);
centerText(g,"fillRect",(x + SHAPE_WIDTH/2), y + SHAPE_HEIGHT,F1);
x=x + SHAPE_WIDTH + COLUMN_SPACE_WIDTH;
g.fillRoundRect(x,y, SHAPE_WIDTH,SHAPE_HEIGHT, 15, 15);
centerText(g,"fillRoundRect",x + SHAPE_WIDTH/2, y + SHAPE_HEIGHT,F1);
x=x + SHAPE_WIDTH + COLUMN_SPACE_WIDTH;
return y;
}
private int drawOtherShapes(Graphics g, int y){
int pentagonXs [] =new int [5];
int pentagonYS[] =new int [5];
int x= 20;
g.drawLine(x,y,x + SHAPE_WIDTH, y + SHAPE_HEIGHT);
centerText(g,"drawLine",(x + SHAPE_WIDTH/2), y +SHAPE_HEIGHT,F1);
x= x + SHAPE_WIDTH + COLUMN_SPACE_WIDTH;
calcPentagon(x +SHAPE_WIDHT/2,y + SHAPE_HEIGHT/2, SHAPE_WIDTH/2,
pentagonXs, pentagonYs);
g.drawPolyline(pentagonXs,pentagonYs, 5);
centerText(g,"drawPolyline",(x + SHAPE_WIDTH/2), y+SHAPE_HEIGHT,F1);
x= x +SHAPE_WIDTH + COLUMN_SPACE_WIDTH;
Font font = new Font("Verdana", Font.BOLD,10);
String t = "Questa é una stringa";
FontMetrics fm=g.getFontMetrics(font);
int text_width=fm.stringWidth(t);
g.setFont(font);
g.drawString(t,x + SHAPE_WIDTH/2 - text_width/2,y+SHAPE_HEIGHT/2);
centerText(g,"drawString",(x+SHAPE_WIDTH/2),y+SHAPE_HEIGHT,F1);
return y;
}
private int centerText (Graphics g , String t , int x , int y , Font f){
FontMetrics fm = g.getFontMetrics(font);
int t_width = fm.stringWidth(t);
int t_height =fm.getHeight();
Color color=g.getColor();
g.setColor(Color.black);
g.setFont(f);
g.drawString(t, x - t_width/2, y+ t_height/2+5);
g.setColor(color);
return (y+t_height);
}
private void calcPentagon(int center_x, int center_y, int radius,
int[] pointsX, int[] pointsY){
double delta_radians = 2.0 * Math.PI / 5.0;
double angle =0.0;
for( int i =0; i < 5; i++ ) {
float x=(float) (radius * Math.sin (angle));
float y=(float) (radius * Math.cos( angle));
pointsX[i] = Math.round(center_x + x);
pointsY[i] = Math.round(center_y + y);
angle +=delta_radians;
}
}
}
import java.awt.*;
public class TestDrawingPanel {
private Frame f;
private DrawingPanel drawPanel;
public TestDrawingPanel() {
f = new Frame ("Disegno di forme con AWT");
drawPanel =new DrawingPanel();
}
public void launchFrame() {
f.add(drawPanel);
f.pack();
f.setSize(new Dimension (DrawingPanel.PANEL_WIDTH,
DrawingPanel.PANEL_HEIGHT));
f.setVisible(true);
}
public static void main (Sring args[]) {
TestDrawingPanel gui = new TestDrawingPanel();
gui.launchFrame();
}
}
Questo mi succede solo da quando ho cominciato a inserire 2 classi nello stesso File, premetto che sono proprio agli inizi e la vedo proprio dura ,comunque grazie a tutti anticipatamente
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