Line

Line Class

A Line object contains the coordinates for a line graphics shape. Line objects use Pen objects to specify the width and color of the line. If an application doesn’t specify a Pen object, the default width is one pixel and the default color is black. See Pen.

Here is an example of how to draw a line on a X11Pane window.

int main () {
  X11Pane new xPane;
  InputEvent new e;
  Pen new bluePen;
  Line new basicLine;

  xPane initialize 10, 10, 100, 100;
  xPane map;
  xPane raiseWindow;
  xPane openEventStream;
  bluePen width = 10;
  bluePen colorName = "blue";
  while (TRUE) {
    xPane inputStream queueInput;
    if (xPane inputStream eventPending) {
      e become xPane inputStream inputQueue unshift;
      switch (e eventClass value)
	{
	case WINDELETE:
	  xPane deleteAndClose;
	  exit (0);
	  break;
	case EXPOSE:
	case RESIZENOTIFY:
	  basicLine start x = 90;
	  basicLine start y = 10;
	  basicLine end x = 10;
	  basicLine end y = 90;
 	  basicLine drawWithPen xPane, bluePen;
	  break;
	default:
	  break;
	}
    }
  }
}

Instance Variables

start

A Point object that contains the receiver’s starting x and y coordinates.

end

A Point object that contains the receiver’s ending x and y coordinates.

Instance Methods

draw (X11Pane paneObject)

Draw a line on the paneObject’s visible area at the receiver’s start and end coordinates, using a default pen width of one pixel and default color of black.

This method is mainly used for drawing on a buffer already attached to a X11Pane object. To draw offscreen to a separate X11Bitmap object, use drawLine in class X11Bitmap. See X11Bitmap.

drawWithPen (X11Pane paneObject, Pen penObject)

Draw a line on the paneObject’s visible area at the receiver’s start and end coordinates. The penObject argument contains the width and color of the line. See Pen.

This method is also used mainly for drawing on a buffer already attached to a X11Pane object. To draw offscreen to a separate X11Bitmap object, use drawLine in class X11Bitmap. See X11Bitmap.