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-1

How can I get the points between a start point (x1, y1) and end point (x2, y2) on a line. I need these points to check if it's located in free space or on an obstacle. How can I do this in Java?

 public void paint(Graphics g) 
 super.paint(g);
 g.drawLine(50, 50, 400, 400);

 

Is there an existing function that can help me get these points?

java graphics awt drawing java-2d

share|improve this question

edited Mar 23 at 2:25

Andrew Thompson

154k29166352

asked Mar 22 at 16:44

zoyazoya

11

• 
  
  
  

  
  4
  

  
  
  
  
  
  

  
  
  That's not how you detect collision(there are theoretically infinitely many points). You should use some analytical function to compare the line with obstacle. You should probably add more context.
  
  – NeplatnyUdaj
  Mar 22 at 16:51
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Regardless of collision i need to get points of the line
  
  – zoya
  Mar 22 at 16:55
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  It is better to use geometry to find out the intersection of your line with various obstacles. If you must get points, you can get points on the line with the formula t*(end - start) + start where t is a number between 0 and 1 representing how far along the line the point is. For half way down your line: x = 0.5 * (400 - 50) + 50 and y = 0.5 * (400 - 50) + 50
  
  – aptriangle
  Mar 22 at 16:58
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Well, the API won't give them but you can calculate those pixels with Bresenham algorithm.
  
  – Arnaud Denoyelle
  Mar 22 at 16:58
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  In short, calculate the slope : if the line is "more horizontal", iterate on x values and find the corresponding y values. If the line is "more vertical", iterate on y values and find the corresponding x values.
  
  – Arnaud Denoyelle
  Mar 22 at 17:03
  

  
  
  
  

 | 
show 3 more comments

-1

How can I get the points between a start point (x1, y1) and end point (x2, y2) on a line. I need these points to check if it's located in free space or on an obstacle. How can I do this in Java?

 public void paint(Graphics g) 
 super.paint(g);
 g.drawLine(50, 50, 400, 400);

 

Is there an existing function that can help me get these points?

java graphics awt drawing java-2d

share|improve this question

edited Mar 23 at 2:25

Andrew Thompson

154k29166352

asked Mar 22 at 16:44

zoyazoya

11

• 
  
  
  

  
  4
  

  
  
  
  
  
  

  
  
  That's not how you detect collision(there are theoretically infinitely many points). You should use some analytical function to compare the line with obstacle. You should probably add more context.
  
  – NeplatnyUdaj
  Mar 22 at 16:51
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Regardless of collision i need to get points of the line
  
  – zoya
  Mar 22 at 16:55
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  It is better to use geometry to find out the intersection of your line with various obstacles. If you must get points, you can get points on the line with the formula t*(end - start) + start where t is a number between 0 and 1 representing how far along the line the point is. For half way down your line: x = 0.5 * (400 - 50) + 50 and y = 0.5 * (400 - 50) + 50
  
  – aptriangle
  Mar 22 at 16:58
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Well, the API won't give them but you can calculate those pixels with Bresenham algorithm.
  
  – Arnaud Denoyelle
  Mar 22 at 16:58
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  In short, calculate the slope : if the line is "more horizontal", iterate on x values and find the corresponding y values. If the line is "more vertical", iterate on y values and find the corresponding x values.
  
  – Arnaud Denoyelle
  Mar 22 at 17:03
  

  
  
  
  

 | 
show 3 more comments

How can I get the points between a start point (x1, y1) and end point (x2, y2) on a line. I need these points to check if it's located in free space or on an obstacle. How can I do this in Java?

 public void paint(Graphics g) 
 super.paint(g);
 g.drawLine(50, 50, 400, 400);

 

Is there an existing function that can help me get these points?

java graphics awt drawing java-2d

share|improve this question

edited Mar 23 at 2:25

Andrew Thompson

154k29166352

asked Mar 22 at 16:44

zoyazoya

11

 public void paint(Graphics g) 
 super.paint(g);
 g.drawLine(50, 50, 400, 400);

 

share|improve this question

edited Mar 23 at 2:25

Andrew Thompson

154k29166352

asked Mar 22 at 16:44

zoyazoya

11

share|improve this question

edited Mar 23 at 2:25

Andrew Thompson

154k29166352

asked Mar 22 at 16:44

zoyazoya

11

edited Mar 23 at 2:25

Andrew Thompson

154k29166352

edited Mar 23 at 2:25

Andrew Thompson

154k29166352

asked Mar 22 at 16:44

zoyazoya

11

asked Mar 22 at 16:44

zoyazoya

11