PaintPanel

package Lab9;

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.util.ArrayList;

import javax.swing.JPanel;

public class PaintPanel extends JPanel implements MouseListener, MouseMotionListener{
    private static final long serialVersionUID = 1L;

    public int x0,y0,x1,y1; //?0-mouse click position ?1- mouse release position
    private int mx, my; //mouse position at any given time
    private Color c= Color.BLACK;
    Outline outline;
    private int mode=0; //1-pencil mode  2-shape mode
    private int panelHeight=100;
    private int cwidth; //tool panel cell width

    ArrayList<Circle> shapes = new ArrayList<Circle>();
    ArrayList<PencilDot> pdots= new ArrayList<PencilDot>();

    public PaintPanel(){

        setPreferredSize(new Dimension(1200,1200));
        setBackground(Color.white);

        addMouseListener(this);
        addMouseMotionListener(this);

    }

    public void paintComponent(Graphics g){
        super.paintComponent(g);
        cwidth = this.getWidth()/10;

        //draw the empty tool panel
        g.setColor(Color.black);
        g.drawRect(0, 0, this.getWidth()-1, panelHeight+1);
        g.setColor(Color.lightGray);
        g.fillRect(1, 1, this.getWidth()-1, panelHeight);

        /*
         * Draw Color Picker
         */
        g.setColor(Color.BLACK);
        g.fillRect(1,1,cwidth,panelHeight);

        g.setColor(Color.RED);
        g.fillRect((cwidth*1),1,cwidth,panelHeight);

        g.setColor(Color.GREEN);
        g.fillRect((cwidth*2),1,cwidth,panelHeight);

        g.setColor(Color.BLUE);
        g.fillRect((cwidth*3),1,cwidth,panelHeight);

        /*
         * Draw Tools picker
         */
        //Pencil
        g.setColor(Color.BLACK);
        g.drawRect((cwidth*4),0,cwidth,panelHeight+1);
        g.drawString("PENCIL", (cwidth*4), 15);

        //Circle
        g.drawRect(cwidth*5,0, cwidth,panelHeight+1);
        if(cwidth*6-cwidth*5>panelHeight)
            g.fillOval(cwidth*5, 1, panelHeight,panelHeight+1);
        else if(cwidth*6-cwidth*5<panelHeight)
            g.fillOval(cwidth*5, 1, cwidth,cwidth);

        g.drawRect(cwidth*9, 0, cwidth, panelHeight+1);
        g.drawString("CLEAR", (cwidth*9), 15);


        //draw canvas
        for(Circle shape:shapes){
            shape.draw(g);
        }
        for(PencilDot pdot:pdots){
            pdot.draw(g);
        }
        //draw outline if it is not null
        if(outline!=null)
            outline.draw(g);


        //mouse position and selected color for debugging
        g.setColor(Color.BLACK);
        g.drawString("X: "+mx+"Y: "+my+" Color: "+c,mx,my);
    }

    @Override
    public void mouseClicked(MouseEvent e) {
        // TODO Auto-generated method stub

    }

    @Override
    public void mouseEntered(MouseEvent e) {
        // TODO Auto-generated method stub

    }

    @Override
    public void mouseExited(MouseEvent e) {
        // TODO Auto-generated method stub

    }

    @Override
    public void mousePressed(MouseEvent e) {
        /*
         * Selecting color
         */
        if(e.getX()>0 && e.getX()<(cwidth) && e.getY()>1 && e.getY()<panelHeight){
            c=Color.BLACK;
            System.out.println("BLACK");

        }
        if(e.getX()>(cwidth) && x1< (cwidth*2) && e.getY()>1 && e.getY()<panelHeight){
            c=Color.RED;
            System.out.println("RED");
        }
        if(e.getX()>(cwidth*2) && x1< (cwidth*3) && e.getY()>1 && e.getY()< panelHeight){
            c=Color.GREEN;
            System.out.println("GREEN");

        }
        if(e.getX()>(cwidth*3) && x1< (cwidth*4) && e.getY()>1 && e.getY()<panelHeight){
            c=Color.BLUE;
            System.out.println("BLUE");

        }
        /*
         * Selecting mode
         */
        if(e.getX()>(cwidth*4)&& x1<(cwidth*5)&& e.getY()>1&&e.getY()<panelHeight){
            mode=0;
        }
        if(e.getX()>(cwidth*5)&& e.getX()<(cwidth*6)&& e.getY()>1&&e.getY()<panelHeight){
            mode=1;
        }
        /*
         * Clear button
         */
        if(e.getX() > cwidth*9 && e.getX() < cwidth*10 && e.getY() > 1 && e.getY() < panelHeight){
            shapes.clear();
            pdots.clear();
        }


        /*
         * if mode set to shapes> get starting position and start the outline of the shape
         */
        if(mode==1){
            x0=e.getX();
            if(e.getY()<100)
                y0=100;
            else
                y0=e.getY();

            outline = new Outline();
            outline.setX(x0);
            outline.setY(y0);
        }

        repaint();
    }


    @Override

    public void mouseReleased(MouseEvent e) {
        //get mouse position on release
        x1=e.getX();
        y1=e.getY();

        //If shapes mode set draw shape and set outline to null
        if(mode==1){
            if((x1-x0>0))
                shapes.add(new Circle(x1-x0, c,x0,y0));
            else
                shapes.add(new Circle(x0-x1,c,x0,y0));
            outline=null;

            repaint();
            }
    }

    @Override
    public void mouseDragged(MouseEvent e) {
        //grab mouse position when dragging
        mx=e.getX();
        my=e.getY();



        //Limit mouse release position within current canvas area
        if(e.getX()>this.getWidth()){
            x1=this.getWidth()-pdots.get(0).getWidth();
        }else if(e.getX()<0){
            x1=0;
        }else{
            x1=e.getX();
        }
        if(e.getY()<panelHeight+1){
            y1=panelHeight;
        }else if(e.getY()>this.getHeight()){
            y1=this.getHeight()-pdots.get(0).getWidth();
        }else{
            y1=e.getY();
        }

        //If pencil mode> add a dot to current mouse position
        if(mode==0){
            pdots.add(new PencilDot(x1,y1,c));
        }else if (mode==1){ //if shapes mode make outline to current mouse position
        outline.setWidth(x1-x0);
        outline.setHeight(y1-y0);

        }
        repaint();
    }

    @Override
    public void mouseMoved(MouseEvent e) {
        //grab mouse position when mouse if moved
        mx=e.getX();
        my=e.getY();
        repaint();
    }


    public void resetValues(){
        //Reset position variables.
        //not used but made it just in case
        x0=0;
        x1=0;
        y0=0;
        y1=0;
    }
}