java - Trying to figure out why my graphics program is not working -
i cannot figure out why graphics program's render function not displaying rectangle. also, if change bufferstrategy '3' funky behavior. currently, project has 2 main classes on called main , second called universaljframe. universaljfame class should called display, @ least can think of being display. please keep in mind still new java programming.
public class main extends canvas implements runnable{ public int w = 200; public int h = 200; public string t = "hello"; private boolean running = false; private universaljframe frame; private thread thread; private bufferstrategy bs; private graphics g; private pausetest pause; public void run(){ system.out.println("run method"); while(running){ render(); tick(); pause.pause(); } stop(); } public synchronized void start(){ if(running) { return; } system.out.println("starting main program"); running = true; thread = new thread(this); thread.start(); } public synchronized void stop(){ if(!running) { return; } system.out.println("stopping"); try { thread.join(); } catch (interruptedexception e) { e.printstacktrace(); } } public void render(){ bs = frame.getcanvas().getbufferstrategy(); if(bs == null){ frame.getcanvas().createbufferstrategy(2); return; } g = bs.getdrawgraphics(); //draw here g.setcolor(color.green); g.fillrect(10, 10, 10, 10); //end draw bs.show(); g.dispose(); } public void tick(){ } public main(){ frame = new universaljframe(h, w, t, this); pause = new pausetest(); pause.setduration(500000); start(); } public static void main(string args[]){ new main(); system.out.println("running main program"); } } public class universaljframe extends canvas { private static final long serialversionuid = 1l; private jframe jframe; private canvas canvas; int height = 200; int width = 200; string title = ""; main obj; public universaljframe(int height, int width, string title, main obj){ this.height = height; this.width = width; this.obj = obj; this.title = title; init(); } public canvas getcanvas(){ return canvas; } private void init(){ jframe = new jframe(title); jframe.setsize(new dimension(width, height)); jframe.setdefaultcloseoperation(jframe.exit_on_close); jframe.setresizable(false); jframe.add(obj); jframe.setlocationrelativeto(null); jframe.setvisible(true); canvas = new canvas(); canvas.setpreferredsize(new dimension(width, height)); canvas.setmaximumsize(new dimension(width, height)); canvas.setminimumsize(new dimension(width, height)); jframe.add(canvas); jframe.pack(); } }
you're using canvas, old awt class.
here's fun example of simple graphics application using java swing.
the eye balls follow cursor around drawing panel.
here's code. can use jframe , drawing jpanel base graphics application.
package com.ggl.testing; import java.awt.color; import java.awt.dimension; import java.awt.graphics; import java.awt.point; import java.awt.event.mouseevent; import java.awt.event.mousemotionadapter; import javax.swing.jframe; import javax.swing.jpanel; import javax.swing.swingutilities; public class movingeyes implements runnable { private static final int drawingwidth = 400; private static final int drawingheight = 400; private static final int eyeballheight = 150; private static final int eyeballwidthmargin = 125; private static final int eyeballouterradius = 50; private static final int eyeballinnerradius = 20; private drawingpanel drawingpanel; private eye[] eyes; private jframe frame; public static void main(string[] args) { swingutilities.invokelater(new movingeyes()); } public movingeyes() { this.eyes = new eye[2]; this.eyes[0] = new eye(new point(eyeballwidthmargin, eyeballheight)); this.eyes[1] = new eye(new point(drawingwidth - eyeballwidthmargin, eyeballheight)); } @override public void run() { frame = new jframe("moving eyes"); frame.setdefaultcloseoperation(jframe.exit_on_close); drawingpanel = new drawingpanel(); frame.add(drawingpanel); frame.pack(); frame.setlocationbyplatform(true); frame.setvisible(true); } public class drawingpanel extends jpanel { private static final long serialversionuid = -2977860217912678180l; public drawingpanel() { this.addmousemotionlistener(new eyeballlistener()); this.setbackground(color.white); this.setpreferredsize(new dimension(drawingwidth, drawingheight)); } @override protected void paintcomponent(graphics g) { super.paintcomponent(g); g.setcolor(color.black); (eye eye : eyes) { drawcircle(g, eye.getorigin(), eyeballouterradius); fillcircle(g, eye.geteyeballorigin(), eyeballinnerradius); } } private void drawcircle(graphics g, point origin, int radius) { g.drawoval(origin.x - radius, origin.y - radius, radius + radius, radius + radius); } private void fillcircle(graphics g, point origin, int radius) { g.filloval(origin.x - radius, origin.y - radius, radius + radius, radius + radius); } } public class eye { private final point origin; private point eyeballorigin; public eye(point origin) { this.origin = origin; this.eyeballorigin = origin; } public point geteyeballorigin() { return eyeballorigin; } public void seteyeballorigin(point eyeballorigin) { this.eyeballorigin = eyeballorigin; } public point getorigin() { return origin; } } public class eyeballlistener extends mousemotionadapter { private final double eyeballdistance = eyeballouterradius - eyeballinnerradius - 5; @override public void mousemoved(mouseevent event) { point p = event.getpoint(); (eye eye : eyes) { point origin = eye.getorigin(); double theta = math.atan2((double) (p.y - origin.y), (double) (p.x - origin.x)); int x = (int) math.round(math.cos(theta) * eyeballdistance) + origin.x; int y = (int) math.round(math.sin(theta) * eyeballdistance) + origin.y; eye.seteyeballorigin(new point(x, y)); } drawingpanel.repaint(); } } }
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