PaintComponent

[frederic202]

What's wrong with this code. There is an unknown problem..
It's just a grid, that works fine, but at the end there is a piece of code that calls another paintComponent method.. Is this a mistake?

package domein;

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.Line2D;

import javax.swing.JPanel;

public class Grid extends JPanel
{
	private int kolommen,rijen;
	private Cel[][] hetBord;

	public Grid(int zijde)
	{
		this.rijen=zijde;
		this.kolommen=zijde;

	}
	
	public void setHetBord(Cel[][] cel)
	{
		hetBord=cel;
	}

public void paintComponent(Graphics g)
{

	int wide = getWidth();		//breedte van de frame
	int tall = getHeight();		//hoogte van de frame
	double rowH = getHeight() / (double)rijen;  //hoogte van een vierkant
	double colH=getWidth()/ (double)kolommen;	//breedte van een vierkant
	double breedteMuur=10;
	int doorsnedePion=(int)colH/2;
	Color brown=new Color(80,0,0);
	g.setColor(brown);  //achtergrondkleur bepalen!
	g.fillRect(0, 0, wide, tall);  //achtergrond helemaal opvullen


	Graphics2D g2 = (Graphics2D) g;
	g2.setColor(Color.black);		//kleur van de streep
	g2.setStroke(new BasicStroke(2));	//dikte van de streep

	for (int i = 1; i < kolommen; i++)			//verticale lijnen cellen
	{
		Line2D verticaal1;

		verticaal1 = new Line2D.Double(i*colH, 0.0,i*colH, (double)getHeight());		//werken met double voor nauwkeurigheid
		g2.draw(verticaal1);
	}

	for (int i = 1; i < kolommen; i++)			//verticale lijnen muren
		{
			Line2D verticaal2;
			verticaal2 = new Line2D.Double(i*colH+breedteMuur, 0.0,i*colH+breedteMuur, (double)getHeight());

			g2.draw(verticaal2);
	}



	for (int i = 1; i < rijen; i++)		//horizontale lijnen cellen
	{
		Line2D horizontaal1;
		horizontaal1 = new Line2D.Double(0.0, (double) (i * rowH),(double) getWidth(), (double) (i * rowH));

		g2.draw(horizontaal1);
	}

	for (int i = 1; i < rijen; i++)		//horizontale lijnen muren
		{
			Line2D horizontaal2;
			horizontaal2 = new Line2D.Double(0.0, (double) (i * rowH+breedteMuur),(double) getWidth(), (double) (i * rowH+breedteMuur));

			g2.draw(horizontaal2);
	}
	g.setColor(Color.red);
	
	for(int i=0;i<hetBord.length;i++)
	{
		for(int j=0;j<hetBord[i].length;j++)					
		{
			hetBord[i][j].getVoorwerp().paintComponent(g);		//hetBord contains objects of the type Voorwerp, who's a subclass of JPanel
		}
	}




}


}

[brad211987]

What problem are you having with it? You will need to be much more specific.

Do you get any errors?
What line/lines seem to be the problem?
Is the behavior as expected, if not where does it differ?

[frederic202]

The problem is this piece of code:

for(int i=0;i<hetBord.length;i++)
	{
		for(int j=0;j<hetBord[i].length;j++)					
		{
			hetBord[i][j].getVoorwerp().paintComponent(g);		//hetBord contains objects of the type Voorwerp, who's a subclass of JPanel
		}
	}

Without this piece, I get a grid in my JFrame, but if I add this piece, the JFrame is just filled with a white color. And the console application tells me that there is an unknown error.

I need this piece to draw shapes for some pawns on my grid