I am currently developing a GUI in Java. I am trying to display a 2D rectangle in a Jpanel called drawpanel in this case. In order to do this, I have created a class called die and initialized the paintComponent and an actionPerformed method. In the actionPerformed I have parsed the doubles from the Jtextfields which will be the inputs of my 2D rectangle. Then I proceeded to draw the rectangle and finally attach it to drawpanel. The problem is that drawpanel.draw(rect) is giving me an error, specifically in draw(rect). This error prevents it from drawing a 2D rectangle. I was wondering if anyone could please help me identify the issue I am running into here. In addition, I have a couple of questions:
class die extends JPanel implements ActionListener{
@Override
protected void paintComponent(Graphics g){
super.paintComponent(g);
}
@Override
public void actionPerformed(ActionEvent e) {
//parsing double values from jtextfields
double xcor = Double.parseDouble(xcoorin.getText());
double ycor = Double.parseDouble(ycoorin.getText());
double lengthdie = Double.parseDouble(Die_L.getText());
double widthdie = Double.parseDouble(Die_W.getText());
//drawing the rectangle
Rectangle2D rect = new Rectangle2D.Double(xcor, ycor, widthdie, lengthdie);
drawpanel.draw(rect);
}
}
ActionListener listen = new die();
locate.addActionListener(listen);
In order to explain where drawpanel comes from:
It is a Jpanel created by inheriting the method Kpackage which is a 2D Drawing created. The code for the drawpanel being added is below:
public class MyFrame{
public MyFrame(){
//Creating new panels for the content window "Frame"
JPanel cyanpanel = new JPanel();
JPanel orangepanel = new JPanel();
JPanel greenpanel = new JPanel();
JPanel magentapanel = new JPanel();
JPanel whitepanel = new JPanel();
JPanel graypanel = new JPanel();
JPanel drawpanel = new Kpackage();
And then, the code for Kpackage() is here:
public class Kpackage extends JPanel{
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g;
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);
Dimension size = this.getSize();
//Dimensions and variables for the package
double scale = 30; //scale of the k package
double aTO_4L = 1.42*scale;
double bTO_4L = 0.30*scale;
double cTO_4L = 5.99*scale;
double dTO_4L = 3.00*scale;
double d1TO_4L = 1.5*scale;
double d2TO_4L = 2.60*scale;
double eTO_4L = 7.26*scale;
double fTO_4L = 0.64*scale;
double gTO_4L = 7.18*scale;
double hTO_4L = 0.38*scale;
double iTO_4L = 7.79*scale;
double jTO_4L = 13.26*scale;
double kTO_4L = 3.78*scale;
double dia_inner = 3.58*scale;
double dia_outer = 7.18*scale;
double tot_width=jTO_4L+2*hTO_4L;
double tot_height=iTO_4L+eTO_4L+d1TO_4L;
double x = (size.width/2);
double y = (size.height/2);
//creating the K package envelope
g2d.draw(new Line2D.Double(x-cTO_4L/2-aTO_4L, y-eTO_4L-d1TO_4L, x-cTO_4L/2,y-eTO_4L-d1TO_4L ));
g2d.draw(new Line2D.Double( x-cTO_4L/2,y-eTO_4L-d1TO_4L ,x-cTO_4L/2,y-eTO_4L-d1TO_4L +bTO_4L));
g2d.draw(new Line2D.Double(x-cTO_4L/2,y-eTO_4L-d1TO_4L +bTO_4L,x-cTO_4L/2+cTO_4L,y-eTO_4L-d1TO_4L+bTO_4L));
g2d.draw(new Line2D.Double(x-cTO_4L/2+cTO_4L,y-eTO_4L-d1TO_4L+bTO_4L,x-cTO_4L/2+cTO_4L,y-eTO_4L-d1TO_4L));
g2d.draw(new Line2D.Double(x-cTO_4L/2+cTO_4L,y-eTO_4L-d1TO_4L,x-cTO_4L/2+cTO_4L+aTO_4L,y-eTO_4L-d1TO_4L));
g2d.draw(new Line2D.Double(x-cTO_4L/2+cTO_4L+aTO_4L,y-eTO_4L-d1TO_4L,x-cTO_4L/2+cTO_4L+aTO_4L+d2TO_4L,y-eTO_4L-d1TO_4L+d1TO_4L));
g2d.draw(new Line2D.Double(x-cTO_4L/2+cTO_4L+aTO_4L+d2TO_4L,y-eTO_4L-d1TO_4L+d1TO_4L,x-cTO_4L/2+cTO_4L+aTO_4L+d2TO_4L,y-eTO_4L-d1TO_4L+d1TO_4L+eTO_4L));
g2d.draw(new Line2D.Double(x-cTO_4L/2+cTO_4L+aTO_4L+d2TO_4L,y-eTO_4L-d1TO_4L+d1TO_4L+eTO_4L,x-cTO_4L/2+cTO_4L+aTO_4L+d2TO_4L-hTO_4L,y-eTO_4L-d1TO_4L+d1TO_4L+eTO_4L));
g2d.draw(new Line2D.Double(x-cTO_4L/2+cTO_4L+aTO_4L+d2TO_4L-hTO_4L,y-eTO_4L-d1TO_4L+d1TO_4L+eTO_4L,x-cTO_4L/2+cTO_4L+aTO_4L+d2TO_4L-hTO_4L,y-eTO_4L-d1TO_4L+d1TO_4L+eTO_4L+iTO_4L));
g2d.draw(new Line2D.Double(x+jTO_4L/2,y-eTO_4L-d1TO_4L+d1TO_4L+eTO_4L+iTO_4L,x-jTO_4L/2,y-eTO_4L-d1TO_4L+d1TO_4L+eTO_4L+iTO_4L));
g2d.draw(new Line2D.Double(x-jTO_4L/2,y-eTO_4L-d1TO_4L+d1TO_4L+eTO_4L+iTO_4L,x-jTO_4L/2,y-eTO_4L-d1TO_4L+d1TO_4L+eTO_4L));
g2d.draw(new Line2D.Double(x-jTO_4L/2,y-eTO_4L-d1TO_4L+d1TO_4L+eTO_4L+iTO_4L,x-jTO_4L/2,y-eTO_4L-d1TO_4L+d1TO_4L+eTO_4L));
g2d.draw(new Line2D.Double(x-jTO_4L/2,y,x-jTO_4L/2-hTO_4L,y));
g2d.draw(new Line2D.Double(x-jTO_4L/2-hTO_4L,y,x-jTO_4L/2-hTO_4L,y-eTO_4L));
g2d.draw(new Line2D.Double(x-jTO_4L/2-hTO_4L,y-eTO_4L,x-jTO_4L/2-hTO_4L+d2TO_4L,y-eTO_4L-d1TO_4L));
g2d.draw(new Ellipse2D.Double(x-dia_inner/2,y-dia_inner/2-kTO_4L,dia_inner,dia_inner));
g2d.draw(new Ellipse2D.Double(x-dia_outer/2,y-dia_outer/2-kTO_4L,dia_outer,dia_outer));
//creating the 4 leg leads
//variables and names
double D_lead = 2.529*scale;
double S_lead = 4.770*scale;
double K_lead=1.5*scale;
double G_lead=2.080*scale;
double S_p1=1.1*scale;
double S_p2=4.270*scale;
double S_p3=0.940*scale;
double S_p4=2.630*scale;
double S_rad=0.5*scale;
double lead_w=1.2*scale;
double lead_h=1.6*scale;
double K_p1=0.32*scale;
double K_p2=1.5*scale;
double K_p3=0.620*scale;
double G_p1=0.880*scale;
double length_lead=3.0*scale;
double dist_1=0.178*scale;
double dist_2=0.450*scale;
double dist_3=0.720*scale;
double dist_4=0.4*scale;
//Creating the lead positions and dimensions
//Drawing D LEAD
g2d.draw(new Line2D.Double(x-jTO_4L/2,y+iTO_4L,x-jTO_4L/2,y+iTO_4L+length_lead));
g2d.draw(new Line2D.Double(x-jTO_4L/2+D_lead,y+iTO_4L,x-jTO_4L/2+D_lead,y+iTO_4L+length_lead));
//Drawing G LEAD
g2d.draw(new Line2D.Double(x+jTO_4L/2-dist_2,y+iTO_4L+dist_1,x+jTO_4L/2-dist_2,y+iTO_4L+dist_1+lead_h));
g2d.draw(new Line2D.Double(x+jTO_4L/2-dist_2,y+iTO_4L+dist_1+lead_h,x+jTO_4L/2-dist_2-G_p1,y+iTO_4L+dist_1+lead_h));
g2d.draw(new Line2D.Double(x+jTO_4L/2-dist_2,y+iTO_4L+dist_1,x+jTO_4L/2-dist_2-G_lead,y+iTO_4L+dist_1));
g2d.draw(new Line2D.Double(x+jTO_4L/2-dist_2-G_lead,y+iTO_4L+dist_1,x+jTO_4L/2-dist_2-G_lead,y+iTO_4L+dist_1+length_lead));
g2d.draw(new Line2D.Double(x+jTO_4L/2-dist_2-G_p1,y+iTO_4L+dist_1+lead_h,x+jTO_4L/2-dist_2-G_p1,y+iTO_4L+dist_1+length_lead));
//Drawing K LEAD
g2d.draw(new Line2D.Double(x+jTO_4L/2-dist_2-G_lead-dist_3,y+iTO_4L+dist_1,x+jTO_4L/2-dist_2-G_lead-dist_3,y+iTO_4L+dist_1+lead_h));
g2d.draw(new Line2D.Double(x+jTO_4L/2-dist_2-G_lead-dist_3,y+iTO_4L+dist_1,x+jTO_4L/2-dist_2-G_lead-dist_3-K_p2,y+iTO_4L+dist_1));
g2d.draw(new Line2D.Double(x+jTO_4L/2-dist_2-G_lead-dist_3-K_p2,y+iTO_4L+dist_1,x+jTO_4L/2-dist_2-G_lead-dist_3-K_p2,y+iTO_4L+dist_1+lead_h));
g2d.draw(new Line2D.Double(x+jTO_4L/2-dist_2-G_lead-dist_3,y+iTO_4L+dist_1+lead_h,x+jTO_4L/2-dist_2-G_lead-dist_3-K_p3,y+iTO_4L+dist_1+lead_h));
g2d.draw(new Line2D.Double(x+jTO_4L/2-dist_2-G_lead-dist_3-K_p3,y+iTO_4L+dist_1+lead_h,x+jTO_4L/2-dist_2-G_lead-dist_3-K_p3,y+iTO_4L+dist_1+length_lead));
g2d.draw(new Line2D.Double(x+jTO_4L/2-dist_2-G_lead-dist_3-K_p2,y+iTO_4L+dist_1+lead_h,x+jTO_4L/2-dist_2-G_lead-dist_3-K_p2-K_p1,y+iTO_4L+dist_1+lead_h));
g2d.draw(new Line2D.Double(x+jTO_4L/2-dist_2-G_lead-dist_3-K_p2-K_p1,y+iTO_4L+dist_1+lead_h,x+jTO_4L/2-dist_2-G_lead-dist_3-K_p2-K_p1,y+iTO_4L+dist_1+length_lead));
//Drawing S LEAD
g2d.draw(new Line2D.Double(x+jTO_4L/2-dist_2-G_lead-dist_3-K_p2-K_p1-dist_4,y+iTO_4L+dist_1+lead_h,x+jTO_4L/2-dist_2-G_lead-dist_3-K_p2-K_p1-dist_4,y+iTO_4L+dist_1));
g2d.draw(new Line2D.Double(x+jTO_4L/2-dist_2-G_lead-dist_3-K_p2-K_p1-dist_4,y+iTO_4L+dist_1,x+jTO_4L/2-dist_2-G_lead-dist_3-K_p2-K_p1-dist_4-S_p2,y+iTO_4L+dist_1));
//connect before end point and after start point
g2d.draw(new Arc2D.Double(x+jTO_4L/2-dist_2-G_lead-dist_3-K_p2-K_p1-dist_4-S_rad-S_p2,y+iTO_4L+dist_1,2*S_rad,2*S_rad,90, 90,Arc2D.OPEN));
g2d.draw(new Line2D.Double(x+jTO_4L/2-dist_2-G_lead-dist_3-K_p2-K_p1-dist_4-S_rad-S_p2,y+iTO_4L+dist_1+S_rad,x+jTO_4L/2-dist_2-G_lead-dist_3-K_p2-K_p1-dist_4-S_rad-S_p2,y+iTO_4L+dist_1+lead_h));
g2d.draw(new Line2D.Double(x+jTO_4L/2-dist_2-G_lead-dist_3-K_p2-K_p1-dist_4,y+iTO_4L+dist_1+lead_h,x+jTO_4L/2-dist_2-G_lead-dist_3-K_p2-K_p1-dist_4-S_p3,y+iTO_4L+dist_1+lead_h));
g2d.draw(new Line2D.Double(x+jTO_4L/2-dist_2-G_lead-dist_3-K_p2-K_p1-dist_4-S_p3,y+iTO_4L+dist_1+lead_h,x+jTO_4L/2-dist_2-G_lead-dist_3-K_p2-K_p1-dist_4-S_p3,y+iTO_4L+dist_1+length_lead));
g2d.draw(new Line2D.Double(x+jTO_4L/2-dist_2-G_lead-dist_3-K_p2-K_p1-dist_4-S_rad-S_p2,y+iTO_4L+dist_1+lead_h,x+jTO_4L/2-dist_2-G_lead-dist_3-K_p2-K_p1-dist_4-S_rad-S_p2+S_p4,y+iTO_4L+dist_1+lead_h));
g2d.draw(new Line2D.Double(x+jTO_4L/2-dist_2-G_lead-dist_3-K_p2-K_p1-dist_4-S_rad-S_p2+S_p4,y+iTO_4L+dist_1+lead_h,x+jTO_4L/2-dist_2-G_lead-dist_3-K_p2-K_p1-dist_4-S_rad-S_p2+S_p4,y+iTO_4L+dist_1+length_lead));
}}
To expand on my comment. To make this work you need to do several things:
Add a draw method to the Kpackage class that accepts a Rectangle2D as an input like so public void draw(Rectangle2D rect){...}, this will fix your initial error.
Create a class variable inside your Kpackage class that can store rectangles ArrayList<Rectangle2D > rectangles = new ArrayList<>();
In the draw method save the inputted rectangle to the ArrayList, then call repaint();
Now the trick here is that the paintComponent method MUST loop the list of rectangles in the ArrayList and draw each one accordingly.
Here is what the Kpackage class might look like if we did all of the above:
public class Kpackage extends JPanel{
//List of added rectangles
private ArrayList<Rectangle2D > rectangles = new ArrayList<>();
//Draw method to insert a new rectangle
public void draw(Rectangle2D rect){
//Save the new rectangle to the list
rectangles.add(rect);
//Trigger a repaint which will call the paintComponent method and draw all the rectangles
repaint();
}
//Overridden method that actually pantis the rectangles
@Override
public void paintComponent(Graphics g){
//Call super to paint the JPanel before anything else
super.paintComponent(g);
//Get the 2D graphics
Graphics2D g2d = (Graphics2D) g;
//Now paint any borders or custom items
//...
//your code here
//etc
//Finally paint the rectangles saved in the list
for (Rectangle2D rectangle : rectangles){
//Draw a basic rectangle, just as proof that this works
g2d.draw(rectangle);
//You will actually do custom drawing scaled to fit your Kpackage here
//But I removed it for clarity, you can play with this section to make it work
//Get sizes and scales
//...
//Draw sides
//...
//Fill rectangle
//...
//etc, etc
}
}
}
And usage would be exactly as you already have it inside your actionPerformed method:
//drawing the rectangle
Rectangle2D rect = new Rectangle2D.Double(x, y, width, length);
drawpanel.draw(rect);