Java

6-Dec-13 2:11

See http://www.codeproject.com/Messages/3137511/Forum-Guidelines-PLEASE-READ.aspx[^], this is a technical forum, we cannot advise you on career choices. If you wish to become a good developer then you need to study hard, and practice, practice, practice.

Veni, vidi, abiit domum

JFrame showing nothing.

chdboy4-Dec-13 23:24

chdboy

4-Dec-13 23:24

I'm not able to see content on JFrame ,when JFrame shows up.

Java

import java.awt.*;

import javax.swing.*;
import java.awt.event.*;
public class GraphicUse extends JPanel
{
public void PaintComponent(Graphics gr)
{	
	super.paintComponents(gr);
	this.setBackground(Color.BLUE);
	gr.setColor(Color.WHITE);
	gr.fillRect(50, 50, 100, 100);
	gr.setColor(new Color(139,38,190));
	gr.fillRect(50, 70, 100, 100);
	gr.setColor(Color.RED);
	gr.drawString("This is a new String", 50, 90);	
}
	
	public static void main(String[] args) 
	{
	}

}

And displaying it in another class which extends Frame

Java

JFrame newframe = new JFrame("Color Frame");
	         newframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);         
	         GraphicUse gu = new GraphicUse();	         
	         newframe.add(gu);
	         newframe.setSize(250,300);
	         newframe.setVisible(true);

Richard MacCutchan4-Dec-13 23:42

4-Dec-13 23:42

Why does your main method not do anything?

Veni, vidi, abiit domum

chdboy5-Dec-13 0:06

chdboy

5-Dec-13 0:06

I'm calling this class from another class so it is using that main class main method.

modified 5-Dec-13 6:26am.

Richard MacCutchan5-Dec-13 0:47

5-Dec-13 0:47

Well you need to provide some more detail about your problem.

Veni, vidi, abiit domum

chdboy5-Dec-13 0:53

chdboy

5-Dec-13 0:53

what other details you need?

Richard MacCutchan5-Dec-13 0:56

5-Dec-13 0:56

No idea; but you need to provide enough to help people to understand the problem. Remember, we have never seen your code before so we cannot guess what each part is supposed to do or how it fits together. Having a blank main method in the code you showed above just serves to confuse.

Veni, vidi, abiit domum

suvi from mumbai10-Dec-13 1:18

suvi from mumbai

10-Dec-13 1:18

Your frame is covered by a gray frame thats why paint method do not show anything.

Variable not updated

Kujtim Hyseni3-Dec-13 8:19

3-Dec-13 8:19

Hello,

I have a code which checks some variable which has to be changed from false to true in other class, but, even if it changes it does not appears.
More details, I have the code:

Java

ms.isDataReady = false;
...
while(!ms.isDataReady);

the loop while waits forever in my main method even if

Java

ms.isDataReady

becomes true in

Java

ms

's appropriate method.

What I should do?

Richard MacCutchan3-Dec-13 8:49

3-Dec-13 8:49

How can it change to true if the loop is running?

Veni, vidi, abiit domum

Kujtim Hyseni3-Dec-13 8:59

3-Dec-13 8:59

It changes somewhere else but it doesn't affects the change in while in other words it doesn't appears changed, unless I use a tricky solution so instead of

Java

while(!ms.isDataReady);

I put

Java

while(!ms.isDataReady) Thread.sleep(1);

Richard MacCutchan3-Dec-13 9:18

3-Dec-13 9:18

Your while statement is not the best way to wait for something to happen, as it will just lock the processor, spinning on that statement.

Veni, vidi, abiit domum

Kujtim Hyseni3-Dec-13 9:20

3-Dec-13 9:20

What do you suggest instead ... ?

Richard MacCutchan3-Dec-13 9:43

3-Dec-13 9:43

Well that depends on what you are trying to do. What is the interaction between these two threads and what is the first one waiting for?

Veni, vidi, abiit domum

Kujtim Hyseni3-Dec-13 9:48

3-Dec-13 9:48

Here are the details of the problem:
I have a class MISPSerial (instance named ms) which deals for stream of bytes to arrive via serial port. In my class which contains the main method I wait for the variable (ms.isDataReady) in MISPSerial which tells that the stream is received completely. So my main method waits for the stream to be received and then continues with instructions that follow. What would you suggest?

Richard MacCutchan3-Dec-13 10:35

Bezier Curve using java Graphics2D

3-Dec-13 10:35

Run the class in the main thread; why do you need multiple threads when the main thread is always blocked on the other one?

Veni, vidi, abiit domum

f262-Dec-13 21:27

2-Dec-13 21:27

Please Helping me to draw using Graphics2D libraries a shape that shape has a path which taken from .svg file, the points are: how to draw same shape by java and display it on awt JFrame

<svg xmlns="http://www.w3.org/2000/svg" version="1.1">
<path
d="m 422.25764,974.44618

c 0.62138,-0.0746 1.75771,1.06129 2.36421,2.98433 0.0315,0.0766 -0.68474,0.41009 -0.71114,0.46361 -0.6326,1.05467 -1.52406,1.83533 -2.77441,2.6392 -0.43509,-0.91104 -0.52393,-1.70072 -0.74833,-2.34191 -0.22902,-0.63165 -0.396,-1.06757 -0.39844,-1.44283 0,-0.33371 0.0997,-0.64158 0.45974,-1.16655 0.51629,-0.74482 1.31804,-1.13113 1.80835,-1.13585 z

m -11.5102,6.90547 c 0.0229,-8e-4 0.0412,-8e-4 0.062,0 0.73295,0.0149 1.65189,1.1421 2.29485,2.45383 -2.29545,0.51575 -3.9309,-0.30763 -3.96949,-0.8076 0.0101,-0.58284 0.91061,-1.60082 1.61259,-1.64623 z

m 21.36555,2.05104 c -1.86343,2.56739 -4.27572,3.04759 -6.5439,2.34948 -1.50641,-0.48472 -2.57444,-1.53726 -3.19873,-3.11172 1.64954,-1.39373 3.61989,-3.29628 3.92443,-4.71392 0.52453,-2.48987 -0.16567,-4.46323 -1.63761,-6.00404 -0.35259,-0.35247 -1.30924,-0.43838 -1.6946,-0.48474 -0.1445,-0.0174 -0.28454,-0.0175 -0.4291,0 -1.01192,0.12268 -2.8825,1.24733 -3.3388,2.25388 -1.0821,2.29486 -0.3907,5.39846 0.61719,7.66014 -1.49231,0.82723 -3.54904,1.68049 -5.07543,2.12491 -0.42938,-1.40319 -0.40783,-3.34993 -1.59908,-4.79196 -1.10233,-1.27046 -4.03902,-0.91215 -4.83829,0.13925 -1.84471,2.44015 -0.42587,6.12024 0.18454,7.0005 1.10044,1.43715 3.56705,1.14657 5.36503,0.77653 -4.24788,9.44304 -8.82131,9.07212 -14.99561,7.87582 -0.66344,-0.11985 -4.40582,1.34024 -3.93038,1.63229 3.08618,1.61186 10.21392,1.93 13.59247,0.27118 3.11258,-1.52841 6.11964,-5.0517 6.82676,-10.28314 2.23997,-0.70968 3.61646,-1.4293 5.34317,-2.34788 0.96569,2.59279 1.77306,4.25088 4.20863,5.00135 3.22983,0.93748 6.13624,-0.68258 7.55088,-2.89928 0.49523,-0.75937 0.68396,-0.86212 1.10163,-0.14973 1.57462,3.09971 6.01007,4.16902 9.97479,2.19814 3.53094,1.26362 6.0483,-0.0626 7.92272,-1.72344 0.66597,0.9248 3.51732,2.03386 4.25958,1.90197 0.77891,-0.16324 1.25413,-1.39941 2.0732,-3.05771 1.99421,0.92835 5.26838,1.89896 5.93368,1.59911 1.85777,-0.8827 1.14978,-5.75424 0.93422,-7.61268 -0.41355,-3.48893 -1.64863,-8.65527 -2.31934,-13.0189 0.39135,-0.51705 0.75416,-2.32899 0.96414,-2.88175 0.17001,-0.73891 -1.48785,-0.52761 -1.8962,-2.01039 -0.0315,-0.10994 -0.10857,-0.17231 -0.19636,-0.17573

l -10e-5,6.8e-4

c -0.0877,-8.8e-4 -0.18678,0.053 -0.25997,0.17921 -0.35245,0.71415 -1.04154,1.7466 -1.22807,2.32933 -0.0546,0.15679 -0.038,0.26225 0.0253,0.40466 0.23266,0.49058 0.82733,1.44531 1.05249,1.93305 0.92658,5.88179 2.59257,14.07191 2.92942,16.8167 -0.55397,1.43149 -3.90406,0.16127 -4.93765,-0.19112 0.75112,-2.27612 -0.58221,-2.57166 -0.83417,-2.04915 -0.43621,0.98873 -0.47361,3.44977 -1.3941,4.58227 -0.11381,0.13924 -0.1691,0.16479 -0.32704,0.13609 -0.90655,-0.16515 -2.64734,-0.57452 -3.38522,-1.02327 0.31022,-0.58754 0.95892,-1.83649 1.02784,-2.6788 0.02,-0.86167 -1.32769,-0.59889 -1.54538,-0.0499 -1.15034,3.2856 -3.5553,4.6267 -6.91502,4.71419 1.14692,-1.54038 1.40236,-2.68829 1.54054,-4.17257 0.0651,-0.76121 -1.31386,-0.69932 -1.54602,-0.0283 -1.08257,2.53934 -1.55895,3.4161 -4.00178,3.9282 -2.2239,0.41552 -4.55677,0.0724 -6.91153,-2.45669 -0.97599,-1.17409 -1.67598,-0.77109 -2.37317,0.10785 z"
/>
</svg>

Thanks

Mohammad Ahmed

Richard MacCutchan3-Dec-13 2:35

3-Dec-13 2:35

See http://docs.oracle.com/javase/7/docs/api/java/awt/Graphics2D.html[^] and http://docs.oracle.com/javase/tutorial/2d/index.html[^].

Veni, vidi, abiit domum

f263-Dec-13 19:55

3-Dec-13 19:55

Thanks for that..
I really want to know how can i use relative path in Java Graphics2D, the curveTo method in GeneralPath class in Java Graphics2D works for absolute path only..
Helping Please
Thanks

Richard MacCutchan3-Dec-13 22:02

3-Dec-13 22:02

ابو عبدالله wrote:
Graphics2D works for absolute path only

As do most graphics packages. You need to calculate the absolute points from the relative ones.

Veni, vidi, abiit domum

f263-Dec-13 23:31

3-Dec-13 23:31

How to calculate those points ?

Richard MacCutchan3-Dec-13 23:41

3-Dec-13 23:41

what do you mean? It's just a matter of adding numbers together, based on your starting point.

Veni, vidi, abiit domum

f264-Dec-13 0:21

4-Dec-13 0:21

Thanks, i solved that problem of relative and absolute points, now i want to know how to put them in array to read them all at once instead of substitute each curve individually the code is :

import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.util.*;
import javax.swing.*;

public class Dal extends Frame {
		       
				

			  public static void main(String[] a){
				  (new Dal()).setVisible(true);
				  GeneralPath g=new GeneralPath();
			  }
			  Dal(){
				  super("Test");
		           setSize(500, 500);
		           addWindowListener(new WindowAdapter() {
		             public void windowClosing(WindowEvent e) {
		               System.exit(0);
		             }
		           });
		         }
			  				    
			   @SuppressWarnings("unused")
			public void paint(Graphics g) {
				   Graphics2D g2d = (Graphics2D) g;
			       g2d.setRenderingHint(RenderingHints.KEY_ALPHA_INTERPOLATION, RenderingHints.VALUE_ALPHA_INTERPOLATION_QUALITY);
		            g2d.setRenderingHint(RenderingHints.KEY_STROKE_CONTROL, RenderingHints.VALUE_STROKE_PURE);
		            g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
		            	   			   
				   GeneralPath path=new GeneralPath();
				  path.moveTo(457.61616,470.82943 );				  
				   	/* */
				   path.curveTo(458.41016,425.70843 ,427.74316,392.55343 ,403.93516,370.91243 );
				   path.curveTo(399.48516,366.83843 ,398.54916,368.02743 ,397.41516,372.27043 );
				   path.curveTo(394.75116,382.25643 ,392.96616,392.69543 ,391.09516,402.03043 );
				   path.curveTo(390.35916,405.62343 ,389.79116,406.92443 ,392.62616,409.52743 );
				   path.curveTo(406.00316,421.83343 ,442.19716,458.07143 ,444.89016,482.76843 );
				   path.curveTo(431.76716,528.31343 ,393.39116,574.56743 ,350.22516,594.56743 );
				   path.curveTo(316.63916,610.12643 ,278.88716,614.34043 ,242.18316,610.35243 );
				   path.curveTo(232.12112,609.27843 ,228.38012,619.29143 ,238.47016,621.92243 );
				   path.curveTo(274.01216,631.28543 ,320.32416,637.73643 ,356.57416,628.91043 );
				   path.curveTo(420.03416,613.46343 ,456.48216,533.71643 ,457.61616,470.82943);  
				  
					path.closePath();
				   g2d.draw(path);
				   g2d.fill(path);
	}		
	}

Richard MacCutchan4-Dec-13 0:30