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Class graph.Markers

java.lang.Object
   |
   +----graph.Markers

public class Markers

extends Object

Version:

$Revision: 1.8 $, $Date: 1996/09/20 00:02:57 $

Author:

Leigh Brookshaw

last

index of the last marker loaded

max

maximum number of markers allowed

vert

An array of vectors.

Markers()

The class contructor

Markers(URL)

Instantiate the Marker class and load marker definitions from the parsed URL.

AddMarker(int, boolean[], int[], int[])

Add the definition of a new marker.

AddMarker(int, int, boolean[], int[], int[])

Add the definition of a new marker.

ClearMarkers()

Clear All markers.

DeleteMarker(int)

Delete the marker with the given index.

draw(Graphics, int, double, int, int)

draw the marker

LoadMarkers(URL)

This method reads the marker file and loads the marker definitions.

 protected int last

index of the last marker loaded

 protected int max

maximum number of markers allowed

 protected Vector vert[]

An array of vectors. Each element in the array contains the vertex vectors for a marker. Marker 1 is at element vert[0].

 public Markers()

The class contructor

 public Markers(URL file) throws IOException

Instantiate the Marker class and load marker definitions from the parsed URL. The format of the file is easily worked out from the default marker file marker.txt.

Parameters:

file - The URL of the data file to read

Throws: IOException

if there is an error with the IO stream.

 public void AddMarker(int m,
                       int n,
                       boolean draw[],
                       int x[],
                       int y[])

Add the definition of a new marker. The arrays contain the vertex points of the marker. The boolean array is used to define a relative draw or move to the vertex. The first vertex should always be a move (The boolean array is "true" for a relative draw.

Parameters:

m - The index of the marker. The first marker has index 1.

n - The number of vertices required to stroke the marker.

draw - Boolean array containing relative move/draw instructions. "true" is a draw.

x - Integer array containing the pixel x position of the vertices. All positions are relative to the center of the marker.

y - Integer array containing the pixel y postions of the vertices.

 public void AddMarker(int n,
                       boolean draw[],
                       int x[],
                       int y[])

Add the definition of a new marker. The new marker is appended onto the marker list. The center of the marker is assumed to be at (0,0).

Parameters:

n - number of move/draw commands

draw - true if the point is to drawn to, false if the point is to be moved to.

x - X pixel to move/draw to.

x - Y pixel to move/draw to.

 public void DeleteMarker(int n)

Delete the marker with the given index. the first marker has index 1.

Parameters:

n - The index of the marker to delete. Markers start at index 1.

 public void ClearMarkers()

Clear All markers.

 public void LoadMarkers(URL file) throws IOException

This method reads the marker file and loads the marker definitions. The format of the file is simple. The following are the keywords.

start

starts a new marker definition.

end

ends a marker definition.

m x y

move to position x,y

l x y

line to position x,y

All line drawing is relative to the previous position. The center of the marker is assumed to be at (0,0). As always blank lines are ignored and comments begin with a # character.

Parameters:

file - URL of file to load

Throws: IOException

If there is an IO error

 public void draw(Graphics g,
                  int m,
                  double scale,
                  int x,
                  int y)

draw the marker

Parameters:

g - Graphics context

m - Index of the marker to draw

scale - scale factor. All coordinates are multiplied by this factor.

x - Coordinate where to draw the marker

y - Coordinate where to draw the marker

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