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Index › Programming Questions & Help › Programs › Creating a line
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Creating a line (Read 376 times)
james007
Creating a line
Feb 24th, 2009, 1:27pm  
Hi, I am just starting out with processing so I am starting from scratch.  

I know this is very simple but I just need to be able to draw a line when the mouse is pressed. I have read the mousePressed, line and understand initial setup.  If I click once I get my "setPoint" click again this setsEndPoint and then should draw the line.  I can then build on this creating my own rectangle or shape.

Any tips on where to look and start would be great.

Thank you
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cloister
Re: Creating a line
Reply #1 - Feb 24th, 2009, 6:50pm  
Quote:
int x1 = 0, y1 = 0, x2 = 0, y2 = 0;
boolean started = false;

void setup()
{
  size(400,400);
  background(0);
  stroke(255);
  noLoop();
}

void draw()
{
  if(started) // can't draw a line until we've started
  {
    line(x1, y1, x2, y2);
  }
}

void mousePressed()
{
  if(started)    // if we're going,
  {
    x1 = x2;     // then shift the previous '2' coordinates
    y1 = y2;     // down to the '1' variables,
    x2 = mouseX; // and get new '2' coordinates.
    y2 = mouseY;
    redraw();
  }
  else
  {
    started = true;
    x2 = mouseX;
    y2 = mouseY;
  }
}
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james007
Re: Creating a line
Reply #2 - Feb 24th, 2009, 7:55pm  
Thank you its given me something to start from. Appreciated.

Thank you

J
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james007
Re: Creating a line
Reply #3 - Feb 25th, 2009, 1:15am  
This has got me started. However, this is great for successive lines however I need to be able to start to create a shape out of lines.

When the mouse is clicked once the 1st point is created (this is required when a key is pressed later going back to the origin point).

When I click the mouse again it has by 2nd pair therefore I can create my one line and do this as many times as I want.  When I hit any key it will go by to my 1st point / orgin)

Any help would be great - its a bit tuff when you are studying on your own.
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