java - Storing shapes in JComponent -
i unsure of how store multiple different shapes using 1 arraylist of type shape. here main.
public class a1 { public static boolean rdraw = false; public static boolean edraw = false; public static boolean ldraw = false; public static void main(string[] args) { jframe frame = new jframe(); jbutton rect = new jbutton("rectangle"); rect.addactionlistener(new actionlistener (){ public void actionperformed(actionevent e){ if(e.getsource()==rect){ rdraw = true; edraw = false; ldraw = false; } } }); jbutton ellipse = new jbutton("ellipse"); ellipse.addactionlistener(new actionlistener (){ public void actionperformed(actionevent e){ if(e.getsource()==ellipse){ rdraw = false; edraw = true; ldraw = false; } } }); jbutton edge = new jbutton("edge"); edge.addactionlistener(new actionlistener (){ public void actionperformed(actionevent e){ if(e.getsource() == edge){ rdraw = false; edraw = false; ldraw = true; } } }); jbutton label = new jbutton("label"); jtextfield labelfield = new jtextfield(20); jpanel panel = new jpanel(); panel.add(rect); panel.add(ellipse); panel.add(edge); panel.add(label); panel.add(labelfield); frame.add(panel,borderlayout.north); jcomponent canvas = new canvas(); frame.add(canvas,borderlayout.center); frame.setdefaultcloseoperation(jframe.exit_on_close); frame.setsize(600, 600); frame.settitle("graph draw"); frame.setvisible(true); } } in canvas, unsure of how use drawshape? , put in paintcomponent store shapes.
public class canvas extends jcomponent { private point p,p2; private rectangle r; private ellipse2d ep; private line2d l; arraylist<shape> shapes = new arraylist<shape>(); public canvas(){ class mymouselistener implements mouselistener{ @override public void mouseclicked(mouseevent arg0) { // todo auto-generated method stub } @override public void mouseentered(mouseevent arg0) { // todo auto-generated method stub } @override public void mouseexited(mouseevent arg0) { // todo auto-generated method stub } @override public void mousepressed(mouseevent e) { if(a1.rdraw == true && a1.edraw == false && a1.ldraw == false){ p = e.getpoint(); r = new rectangle(p.x, p.y, p.x - p.x, p.y - p.y); } else if (a1.rdraw == false && a1.edraw == true && a1.ldraw == false){ p = e.getpoint(); ep = new ellipse2d.double(p.x, p.y, p.x - p.x, p.y - p.y); } else if (a1.rdraw == false && a1.edraw == false && a1.ldraw == true){ p = e.getpoint(); l = new line2d.double(p.x, p.y, p.x - p.x, p.y - p.y); } } @override public void mousereleased(mouseevent e) { if(a1.rdraw == true && a1.edraw == false && a1.ldraw == false){ if (r.width != 0 || r.height != 0) { addrectangle(r); } r = null; } else if (a1.rdraw == false && a1.edraw == true && a1.ldraw == false){ if (ep.getwidth() != 0 || ep.getheight() != 0){ addellipse(ep); } ep = null; } else if (a1.rdraw == false && a1.edraw == false && a1.ldraw == true){ if (l.getp1() != null || l.getp2() != null){ addline(l); } l = null; } } } class mymousemotionlistener implements mousemotionlistener{ @override public void mousedragged(mouseevent e) { if(a1.rdraw == true && a1.edraw == false && a1.ldraw == false){ int x = math.min(p.x, e.getx()); int y = math.min(p.y, e.gety()); int width = math.abs(p.x - e.getx()); int height = math.abs(p.y - e.gety()); r.setbounds(x, y, width, height); repaint(); } else if (a1.rdraw == false && a1.edraw == true && a1.ldraw == false){ int x = math.min(p.x, e.getx()); int y = math.min(p.y, e.gety()); int width = math.abs(p.x - e.getx()); int height = math.abs(p.y - e.gety()); ep.setframe(x, y, width, height); repaint(); } else if (a1.rdraw == false && a1.edraw == false && a1.ldraw == true){ p2 = e.getpoint(); l.setline(p, p2); repaint(); } } @override public void mousemoved(mouseevent arg0) { // todo auto-generated method stub } } mouselistener mlistener = new mymouselistener(); addmouselistener(mlistener); mousemotionlistener mmlistener = new mymousemotionlistener(); addmousemotionlistener(mmlistener); } public void paintcomponent(graphics g){ super.paintcomponent(g); graphics2d g2d = (graphics2d) g; (shape shape:shapes){ } if(a1.rdraw == true && a1.edraw == false && a1.ldraw == false){ g2d.draw(r); } else if (a1.rdraw == false && a1.edraw == true && a1.ldraw == false){ g2d.draw(ep); } else if (a1.rdraw == false && a1.edraw == false && a1.ldraw == true){ g2d.draw(l); } } public void addrectangle(rectangle rect){ if(r != null){ rectangle cr = new rectangle(rect); shapes.add(cr); repaint(); } } public void addellipse(ellipse2d ellipse){ if (ep != null){ ellipse2d cep = new ellipse2d.double(ellipse.getx(),ellipse.gety(),ellipse.getwidth(),ellipse.getheight()); shapes.add(cep); repaint(); } } public void addline(line2d line){ if(l != null){ line2d cl = new line2d.double(line.getp1(), line.getp2()); shapes.add(cl); repaint(); } } }
your paintcomponent method appears doing , little: little in it's not drawing shapes, , in it's trying things static boolean fields shouldn't.
"...and put in paintcomponent store shapes."
this shouldn't part of paintcomponent method. method drawing items on component , nothing more. should not used program logic. code storing shapes should in mouse listener type code, not in paintcomponent.
i think need in paintcomponent this:
public void paintcomponent(graphics g) { super.paintcomponent(g); graphics2d g2d = (graphics2d) g; (shape shape : shapes) { g2d.draw(shape); // !! added } } as couple of side notes:
- you've got static code within a1 class, including static fields, , of should instance code, , of code within main method should removed , placed constructor. main method should small.
- you'll want rename canvas class different creates potential name clash core java class,
java.awt.canvas, , might confuse others or compiler should move class package in future. - you can combine mouselistener , mousemotionlistener code single class extends mouseadapter. simplify code, , allow avoid posting empty method stops.
- since drawing selections mutually exclusive, use jradiobuttons or jtogglebuttons held in single buttongroup, user can see selection active, , selection of 1 button turns off selection of others.
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