| java.lang.Object
 edu.hws.jcm.draw.Drawable
All known Subclasses: edu.hws.jcm.draw.Axes, edu.hws.jcm.draw.DrawString, edu.hws.jcm.draw.DrawGeometric, edu.hws.jcm.draw.Grid, edu.hws.jcm.draw.ScatterPlot, edu.hws.jcm.draw.DraggablePoint, edu.hws.jcm.draw.RiemannSumRects, edu.hws.jcm.draw.Graph1D, edu.hws.jcm.draw.Panner, edu.hws.jcm.draw.ParametricCurve, edu.hws.jcm.draw.VectorField, edu.hws.jcm.draw.DrawBorder, edu.hws.jcm.draw.MouseTracker, edu.hws.jcm.functions.TableFunctionGraph,
| Drawable | | abstract public class Drawable implements java.io.Serializable(Code) | | A Drawable object can be added to a CoordinateRect, which is itself in
a DisplayCanvas. Its purpose is, generally, to draw something in the
rectangular area represented by the CoordinateRect. The drawing can
use information in the CoordinateRect, which includes both the real
number coordinates and the pixel coordinates of the rectangular area.
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| Method Summary | |
| abstract public void | draw(Graphics g, boolean coordsChanged)
Draw this drawable in the graphics context g. | | public boolean | getVisible()
Return true if this Drawable is visible, false if it is hidden. | | public void | needsRedraw()
This routine should be called if the appearance of the Drawable changes
so that the rectangular area that it occupies has to be redrawn.
The routine is generally meant to be called by the Drawable itself.
It will notify the DisplayCanvas, canvas, that the CoordinateRect,
coords, needs to be redrawn, where canvas and coords are the member
variables in this class. | | protected void | setOwnerData(DisplayCanvas canvas, CoordinateRect coords)
Sets the values of member variables canvas and coords. | | public void | setVisible(boolean show)
Set the visibility of this Drawable. |
| canvas | | protected DisplayCanvas canvas(Code) | | The canvas on which this Drawable is drawn. This is set
automatically when the Drawable is added to a CoordinateRect
and it should not be changed. (It will be changed automatically
if the Drawable is removed from the CoordinateRect.)
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| coords | | protected CoordinateRect coords(Code) | | The CoordinateRect for the rectagular area where this
Drawable is drawn. This is set automatically when the
Drawable is added to a CoordingteRect and should not be
changed. (It will be changed automatically if the
Drawable is removed from the CoordinateRect.)
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| draw | | abstract public void draw(Graphics g, boolean coordsChanged)(Code) | | Draw this drawable in the graphics context g. This is meant to
be called only by the CoordinateRect, coords, that manages this Drawable.
The coords contains information about the rectangular area in which
this Drawable is displayed, both in terms of pixels and in terms
of real (x,y)-coordinates.
The value of coordsChanged is true if any of the values
coords.getXmin(), coords.getXmax(), coords.getYmin(), coords.getYmax(),
coords.getLeft(), coords.getRight(), coords.getTop(), coords.getBottom(),
or coords.getGap() has changed. Drawables that depend only on this
information can check the value of coordsChanged to see whether they
need to update any previously computed member variables that
depend on these values. This method is meant to be called only by the system.
Parameters:
g - The graphics context in which the Drawble is to be drawn. (The drawing can change the color in g, but should not permanently change font, painting mode, etc.Thus, every drawable is responsible for setting the color it wants to use.)
Parameters:
coordsChanged - Indicates whether the CoordinateRect has changed. |
| getVisible | | public boolean getVisible()(Code) | | Return true if this Drawable is visible, false if it is hidden.
A hidden Drawable is ignored by the CoordinateRect that manages it.
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| needsRedraw | | public void needsRedraw()(Code) | | This routine should be called if the appearance of the Drawable changes
so that the rectangular area that it occupies has to be redrawn.
The routine is generally meant to be called by the Drawable itself.
It will notify the DisplayCanvas, canvas, that the CoordinateRect,
coords, needs to be redrawn, where canvas and coords are the member
variables in this class. If canvas is null, nothing happens, since
presumably the Drawable is not displayed anywhere in that case.
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| setOwnerData | | protected void setOwnerData(DisplayCanvas canvas, CoordinateRect coords)(Code) | | Sets the values of member variables canvas and coords. This is
designed to be called only by the CoordinateRect class.
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| setVisible | | public void setVisible(boolean show)(Code) | | Set the visibility of this Drawable. If show is false, then
the Drawable is hidden. If it is true, the Drawable is shown.
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