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Thread: Writing a method to draw a rotatable rectangle using Graphics2D

  1. May 17th, 2012, 04:38 PM #1
    johnpooley3
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    Default Writing a method to draw a rotatable rectangle using Graphics2D

    I am trying to create a method (for robocode) that draws a rotatable rectangle with the (X,Y) coordinates referring to the center of rotation. I have created a method stub, but cannot figure out the actual math for the problem. 

    //draws a rectangle centered on (x, y) with h heading in degrees, 0 is up, 90 is right. Sides are of length l and of height w
public static void drawRotatedRect(Graphics2D g, double x, double y, double h, double l, double w, Color c)
{
     Color returnColor = g.getColor();
     g.setColor(c);
 
     //draw four sides using Graphics.drawLine()?
 
     g.setColor(returnColor);
}

    What mathy shenanigans can I use to calculate the XY's of the four corners, so I can pass them into Graphics.drawLine()? Thanks in advance
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  3. May 17th, 2012, 05:32 PM #2
    copeg
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    Default Re: Writing a method to draw a rotatable rectangle using Graphics2D

    Unless you are required to write the math yourself, an easier way would be to use the methods available in the Graphics2D or AffineTransform class - namely rotate and translate (its always a good idea to get the AffineTransform prior to setting these methods, and reset it afterwards to avoid affecting the transform of future drawing)
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    johnpooley3 (May 17th, 2012)
  5. May 17th, 2012, 11:39 PM #3
    johnpooley3
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    Default Re: Writing a method to draw a rotatable rectangle using Graphics2D

    Is this the correct way to implement that class?

    public static void drawRotatedRect(Graphics2D g, double x, double y, double heading, double h, double w)
	{
	     AffineTransform returnTransform = g.getTransform();
	     g.setTransform(AffineTransform.getRotateInstance(heading, x, y));
	     g.drawRect((int) (x-w/2), (int) (y-h/2), (int) w, (int) h);
	     g.setTransform(returnTransform);
	}

    Because when I run this method (using robocode) it gives me this stack trace and draws a rectangle without rotation:

    java.lang.ArrayIndexOutOfBoundsException: 63
	at net.sf.robocode.robotpaint.Graphics2DSerialized.readMethod(Graphics2DSerialized.java:2172)
	at net.sf.robocode.robotpaint.Graphics2DSerialized.processQueuedCall(Graphics2DSerialized.java:1418)
	at net.sf.robocode.robotpaint.Graphics2DSerialized.processTo(Graphics2DSerialized.java:1393)
	at net.sf.robocode.ui.battleview.BattleView.drawRobotPaint(BattleView.java:511)
	at net.sf.robocode.ui.battleview.BattleView.drawBattle(BattleView.java:325)
	at net.sf.robocode.ui.battleview.BattleView.update(BattleView.java:180)
	at net.sf.robocode.ui.battleview.BattleView.access$500(BattleView.java:55)
	at net.sf.robocode.ui.battleview.BattleView$BattleObserver.onTurnEnded(BattleView.java:683)
	at net.sf.robocode.battle.events.BattleEventDispatcher.onTurnEnded(BattleEventDispatcher.java:131)
	at net.sf.robocode.ui.battle.AwtBattleAdaptor.awtOnTurnEnded(AwtBattleAdaptor.java:128)
	at net.sf.robocode.ui.battle.AwtBattleAdaptor.access$200(AwtBattleAdaptor.java:35)
	at net.sf.robocode.ui.battle.AwtBattleAdaptor$BattleObserver$2.run(AwtBattleAdaptor.java:208)
	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:682)
	at java.awt.EventQueue.access$000(EventQueue.java:85)
	at java.awt.EventQueue$1.run(EventQueue.java:643)
	at java.awt.EventQueue$1.run(EventQueue.java:641)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:652)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:296)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:211)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:201)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:196)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:188)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
java.lang.ArrayIndexOutOfBoundsException: -16
	at net.sf.robocode.robotpaint.Graphics2DSerialized.readMethod(Graphics2DSerialized.java:2172)
	at net.sf.robocode.robotpaint.Graphics2DSerialized.processQueuedCall(Graphics2DSerialized.java:1418)
	at net.sf.robocode.robotpaint.Graphics2DSerialized.processTo(Graphics2DSerialized.java:1393)
	at net.sf.robocode.ui.battleview.BattleView.drawRobotPaint(BattleView.java:511)
	at net.sf.robocode.ui.battleview.BattleView.drawBattle(BattleView.java:325)
	at net.sf.robocode.ui.battleview.BattleView.update(BattleView.java:180)
	at net.sf.robocode.ui.battleview.BattleView.access$500(BattleView.java:55)
	at net.sf.robocode.ui.battleview.BattleView$BattleObserver.onTurnEnded(BattleView.java:683)
	at net.sf.robocode.battle.events.BattleEventDispatcher.onTurnEnded(BattleEventDispatcher.java:131)
	at net.sf.robocode.ui.battle.AwtBattleAdaptor.awtOnTurnEnded(AwtBattleAdaptor.java:128)
	at net.sf.robocode.ui.battle.AwtBattleAdaptor.access$200(AwtBattleAdaptor.java:35)
	at net.sf.robocode.ui.battle.AwtBattleAdaptor$BattleObserver$2.run(AwtBattleAdaptor.java:208)
	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:682)
	at java.awt.EventQueue.access$000(EventQueue.java:85)
	at java.awt.EventQueue$1.run(EventQueue.java:643)
	at java.awt.EventQueue$1.run(EventQueue.java:641)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:652)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:296)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:211)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:201)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:196)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:188)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
java.lang.ArrayIndexOutOfBoundsException: -67
	at net.sf.robocode.robotpaint.Graphics2DSerialized.readMethod(Graphics2DSerialized.java:2172)
	at net.sf.robocode.robotpaint.Graphics2DSerialized.processQueuedCall(Graphics2DSerialized.java:1418)
	at net.sf.robocode.robotpaint.Graphics2DSerialized.processTo(Graphics2DSerialized.java:1393)
	at net.sf.robocode.ui.battleview.BattleView.drawRobotPaint(BattleView.java:511)
	at net.sf.robocode.ui.battleview.BattleView.drawBattle(BattleView.java:325)
	at net.sf.robocode.ui.battleview.BattleView.update(BattleView.java:180)
	at net.sf.robocode.ui.battleview.BattleView.access$500(BattleView.java:55)
	at net.sf.robocode.ui.battleview.BattleView$BattleObserver.onTurnEnded(BattleView.java:683)
	at net.sf.robocode.battle.events.BattleEventDispatcher.onTurnEnded(BattleEventDispatcher.java:131)
	at net.sf.robocode.ui.battle.AwtBattleAdaptor.awtOnTurnEnded(AwtBattleAdaptor.java:128)
	at net.sf.robocode.ui.battle.AwtBattleAdaptor.access$200(AwtBattleAdaptor.java:35)
	at net.sf.robocode.ui.battle.AwtBattleAdaptor$BattleObserver$2.run(AwtBattleAdaptor.java:208)
	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:682)
	at java.awt.EventQueue.access$000(EventQueue.java:85)
	at java.awt.EventQueue$1.run(EventQueue.java:643)
	at java.awt.EventQueue$1.run(EventQueue.java:641)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:652)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:296)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:211)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:201)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:196)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:188)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
java.nio.BufferUnderflowException
	at java.nio.Buffer.nextGetIndex(Buffer.java:478)
	at java.nio.HeapByteBuffer.getInt(HeapByteBuffer.java:336)
	at net.sf.robocode.robotpaint.Graphics2DSerialized.processTranslate_int(Graphics2DSerialized.java:1619)
	at net.sf.robocode.robotpaint.Graphics2DSerialized.processQueuedCall(Graphics2DSerialized.java:1422)
	at net.sf.robocode.robotpaint.Graphics2DSerialized.processTo(Graphics2DSerialized.java:1393)
	at net.sf.robocode.ui.battleview.BattleView.drawRobotPaint(BattleView.java:511)
	at net.sf.robocode.ui.battleview.BattleView.drawBattle(BattleView.java:325)
	at net.sf.robocode.ui.battleview.BattleView.update(BattleView.java:180)
	at net.sf.robocode.ui.battleview.BattleView.access$500(BattleView.java:55)
	at net.sf.robocode.ui.battleview.BattleView$BattleObserver.onTurnEnded(BattleView.java:683)
	at net.sf.robocode.battle.events.BattleEventDispatcher.onTurnEnded(BattleEventDispatcher.java:131)
	at net.sf.robocode.ui.battle.AwtBattleAdaptor.awtOnTurnEnded(AwtBattleAdaptor.java:128)
	at net.sf.robocode.ui.battle.AwtBattleAdaptor.access$200(AwtBattleAdaptor.java:35)
	at net.sf.robocode.ui.battle.AwtBattleAdaptor$BattleObserver$2.run(AwtBattleAdaptor.java:208)
	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:682)
	at java.awt.EventQueue.access$000(EventQueue.java:85)
	at java.awt.EventQueue$1.run(EventQueue.java:643)
	at java.awt.EventQueue$1.run(EventQueue.java:641)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:652)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:296)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:211)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:201)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:196)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:188)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
java.nio.BufferUnderflowException
	at java.nio.Buffer.nextGetIndex(Buffer.java:478)
	at java.nio.HeapByteBuffer.getInt(HeapByteBuffer.java:336)
	at net.sf.robocode.robotpaint.Graphics2DSerialized.processTranslate_int(Graphics2DSerialized.java:1619)
	at net.sf.robocode.robotpaint.Graphics2DSerialized.processQueuedCall(Graphics2DSerialized.java:1422)
	at net.sf.robocode.robotpaint.Graphics2DSerialized.processTo(Graphics2DSerialized.java:1393)
	at net.sf.robocode.ui.battleview.BattleView.drawRobotPaint(BattleView.java:511)
	at net.sf.robocode.ui.battleview.BattleView.drawBattle(BattleView.java:325)
	at net.sf.robocode.ui.battleview.BattleView.update(BattleView.java:180)
	at net.sf.robocode.ui.battleview.BattleView.access$500(BattleView.java:55)
	at net.sf.robocode.ui.battleview.BattleView$BattleObserver.onTurnEnded(BattleView.java:683)
	at net.sf.robocode.battle.events.BattleEventDispatcher.onTurnEnded(BattleEventDispatcher.java:131)
	at net.sf.robocode.ui.battle.AwtBattleAdaptor.awtOnTurnEnded(AwtBattleAdaptor.java:128)
	at net.sf.robocode.ui.battle.AwtBattleAdaptor.access$200(AwtBattleAdaptor.java:35)
	at net.sf.robocode.ui.battle.AwtBattleAdaptor$BattleObserver$2.run(AwtBattleAdaptor.java:208)
	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:682)
	at java.awt.EventQueue.access$000(EventQueue.java:85)
	at java.awt.EventQueue$1.run(EventQueue.java:643)
	at java.awt.EventQueue$1.run(EventQueue.java:641)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:652)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:296)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:211)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:201)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:196)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:188)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
java.lang.ArrayIndexOutOfBoundsException: -36
	at net.sf.robocode.robotpaint.Graphics2DSerialized.readMethod(Graphics2DSerialized.java:2172)
	at net.sf.robocode.robotpaint.Graphics2DSerialized.processQueuedCall(Graphics2DSerialized.java:1418)
	at net.sf.robocode.robotpaint.Graphics2DSerialized.processTo(Graphics2DSerialized.java:1393)
	at net.sf.robocode.ui.battleview.BattleView.drawRobotPaint(BattleView.java:511)
	at net.sf.robocode.ui.battleview.BattleView.drawBattle(BattleView.java:325)
	at net.sf.robocode.ui.battleview.BattleView.update(BattleView.java:180)
	at net.sf.robocode.ui.battleview.BattleView.access$500(BattleView.java:55)
	at net.sf.robocode.ui.battleview.BattleView$BattleObserver.onTurnEnded(BattleView.java:683)
	at net.sf.robocode.battle.events.BattleEventDispatcher.onTurnEnded(BattleEventDispatcher.java:131)
	at net.sf.robocode.ui.battle.AwtBattleAdaptor.awtOnTurnEnded(AwtBattleAdaptor.java:128)
	at net.sf.robocode.ui.battle.AwtBattleAdaptor.access$200(AwtBattleAdaptor.java:35)
	at net.sf.robocode.ui.battle.AwtBattleAdaptor$BattleObserver$2.run(AwtBattleAdaptor.java:208)
	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:682)
	at java.awt.EventQueue.access$000(EventQueue.java:85)
	at java.awt.EventQueue$1.run(EventQueue.java:643)
	at java.awt.EventQueue$1.run(EventQueue.java:641)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:652)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:296)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:211)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:201)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:196)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:188)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

    Thanks again!
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  6. May 18th, 2012, 09:28 AM #4
    copeg
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    Default Re: Writing a method to draw a rotatable rectangle using Graphics2D

    The stack trace has nothing to do with the drawRotatedRect method you posted. See your drawRobotPaint...line 511 in the BattleView class to be exact
    Code Tags | Java Tutorials | SSCCE | Getting Help | What Not To Do
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