Move a Graphic in Java,using keyboard arrows and mouseEvent -
i'm beginner in learning this.doing test drawing triangle , want move it.it's not working want ask what's mistake.sorry it's long. import javax.swing.jframe; import javax.swing.jpanel;
import java.awt.color; import java.awt.graphics; import java.awt.event.*; public class test extends jframe { private triangle triangle; private final int step = 10; private triangle keyboardpanel = new triangle(); public static void main(string[] args) { test t = new test(); } public test() { settitle("try try try"); setlocationrelativeto(null); // center frame setdefaultcloseoperation(jframe.exit_on_close); setbounds(100, 100, 500, 500); jpanel tripanel = new jpanel(); add(tripanel); triangle = new triangle(); tripanel.addkeylistener(null); tripanel.addmouselistener(null); tripanel.addmousemotionlistener(null); setvisible(true); } static class move extends jpanel implements keylistener,mouselistener, mousemotionlistener{ private int x = 210; private int y = 210; private color color = color.black; move() { addkeylistener(this); addmouselistener(this); addmousemotionlistener(this); } @override public void keypressed(keyevent ke) { int keycode = ke.getkeycode(); system.out.println("key code is" +keycode); /*switch (keycode) { case keyevent.vk_up: triangle.movetriangle(-10, 0); break; case keyevent.vk_down: triangle.movetriangle(10, 0); break; case keyevent.vk_left: triangle.movetriangle(0, -10); break; case keyevent.vk_right: triangle.movetriangle(0, 10); break; } repaint();*/ } @override public void keyreleased(keyevent arg0) { // todo auto-generated method stub } @override public void keytyped(keyevent arg0) { // todo auto-generated method stub } @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) { system.out.println("hello"); x = e.getx(); y = e.gety(); repaint(); } @override public void mousereleased(mouseevent arg0) { // todo auto-generated method stub } @override public void mousedragged(mouseevent e) { x = e.getx(); y = e.gety(); system.out.println("hello123"); if(e.iscontroldown()) color = color.red; else color = color.black; repaint(); } @override public void mousemoved(mouseevent e) { // todo auto-generated method stub system.out.println(e.getpoint()); } } public void paint(graphics g) { super.paint(g); triangle.drawtriangle(g); } public void paintcomponent(graphics g) { super.paintcomponents(g); triangle.drawtriangle(g); } } import java.awt.graphics; import javax.swing.jpanel; public class triangle { private point p1; private point p2; private point p3; int numx; int numy; public triangle() { p1 = new point(200,200); p2 = new point(170,230); p3 = new point(230,230); } public void movetriangle(int dx, int dy) { p1.move(dx, dy); p2.move(dx, dy); p3.move(dx, dy); } public void drawtriangle(graphics g) { g.drawline(p1.getx(), p1.gety(),p2.getx(),p2.gety()); g.drawline(p2.getx(),p2.gety(),p3.getx(),p3.gety()); g.drawline(p3.getx(), p3.gety(),p1.getx(),p1.gety()); } } public class point { private int x; private int y; public point(int x, int y) { x = x; y = y; } public void setx(int x) { x = x; } public void sety(int y) { x = y; } public int getx() { return x; } public int gety() { return y; } public void move(int dx, int dy) { x +=dx; y +=dy; } public string tostring() { return("x = "+x+" y= "+y); } }
there lot of problems in code .when coding test current code before go further.
you create panel , add jframe .
jpanel tripanel = new jpanel(); add(tripanel); but graphical mechanism has written in move panel need make move panel instead of jpanel.
keylistners has added panel keylisners not triggered because keylistners work when component focused . works component jtextfiled . not panels .you have use keybinding .i have added keybind rightarrow key ..you have add other keys ,down etc..
also move paint method jframe move jpanel .
example code (run code , press right arrow ->)
import java.awt.color; import java.awt.graphics; import java.awt.event.*; import javax.swing.abstractaction; import javax.swing.jcomponent; import javax.swing.jframe; import javax.swing.jpanel; import javax.swing.keystroke; public class test extends jframe { private triangle triangle; private final int step = 10; private triangle keyboardpanel = new triangle(); public static void main(string[] args) { test t = new test(); } public test() { settitle("try try try"); setlocationrelativeto(null); // center frame setdefaultcloseoperation(jframe.exit_on_close); setbounds(100, 100, 500, 500); jpanel tripanel = new move(); add(tripanel); triangle = new triangle(); setvisible(true); } class move extends jpanel implements mouselistener, mousemotionlistener { private int x = 210; private int y = 210; private color color = color.black; move() { addmouselistener(move.this); addmousemotionlistener(move.this); this.getinputmap(jcomponent.when_in_focused_window).put(keystroke.getkeystroke(keyevent.vk_right, 0), "moveright"); this.getactionmap().put("moveright", new abstractaction() { @override public void actionperformed(actionevent e) { triangle.movetriangle(10, 0); repaint(); } }); } @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) { system.out.println("hello"); x = e.getx(); y = e.gety(); repaint(); } @override public void mousereleased(mouseevent arg0) { // todo auto-generated method stub } @override public void mousedragged(mouseevent e) { x = e.getx(); y = e.gety(); system.out.println("hello123"); if (e.iscontroldown()) { color = color.red; } else { color = color.black; } repaint(); } @override public void mousemoved(mouseevent e) { // todo auto-generated method stub //system.out.println(e.getpoint()); } @override public void paint(graphics g) { super.paint(g); triangle.drawtriangle(g); } } class triangle { private point p1; private point p2; private point p3; int numx; int numy; public triangle() { p1 = new point(200, 200); p2 = new point(170, 230); p3 = new point(230, 230); } public void movetriangle(int dx, int dy) { p1.move(dx, dy); p2.move(dx, dy); p3.move(dx, dy); } public void drawtriangle(graphics g) { g.drawline(p1.getx(), p1.gety(), p2.getx(), p2.gety()); g.drawline(p2.getx(), p2.gety(), p3.getx(), p3.gety()); g.drawline(p3.getx(), p3.gety(), p1.getx(), p1.gety()); } } class point { private int x; private int y; public point(int x, int y) { x = x; y = y; } public void setx(int x) { x = x; } public void sety(int y) { x = y; } public int getx() { return x; } public int gety() { return y; } public void move(int dx, int dy) { x += dx; y += dy; } public string tostring() { return ("x = " + x + " y= " + y); } } } output >>
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