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Class java.awt.Graphics
java.lang.Object
|
+----java.awt.Graphics
- public abstract class Graphics
- extends Object
The Graphics
class is the abstract base class for
all graphics contexts that allow an application to draw onto
components that are realized on various devices, as well as
onto off-screen images.
A Graphics
object encapsulates state information needed
for the basic rendering operations that Java supports. This
state information includes the following properties:
- The
Component
object on which to draw.
- A translation origin for rendering and clipping coordinates.
- The current clip.
- The current color.
- The current font.
- The current logical pixel operation function (XOR or Paint).
- The current XOR alternation color
(see
setXORMode
).
Coordinates are infinitely thin and lie between the pixels of the
output device.
Operations which draw the outline of a figure operate by traversing
an infinitely thin path between pixels with a pixel-sized pen that hangs
down and to the right of the anchor point on the path.
Operations which fill a figure operate by filling the interior
of that infinitely thin path.
Operations which render horizontal text render the ascending
portion of character glyphs entirely above the baseline coordinate.
The graphics pen hangs down and to the right from the path it traverses.
This has the following implications:
- If you draw a figure that covers a given rectangle, that
figure occupies one extra row of pixels on the right and bottom edges
as compared to filling a figure that is bounded by that same rectangle.
- If you draw a horizontal line along the same y coordinate as
the baseline of a line of text, that line is drawn entirely below
the text, except for any descenders.
All coordinates which appear as arguments to the methods of this
Graphics
object are considered relative to the
translation origin of this Graphics
object prior to
the invocation of the method.
All rendering operations modify only pixels which lie within the
area bounded by both the current clip of the graphics context
and the extents of the component used to create the
Graphics
object.
All drawing or writing is done in the current color,
using the current paint mode, and in the current font.
- Since:
- JDK1.0
- See Also:
- Component, clipRect, setColor, setPaintMode, setXORMode, setFont
-
Graphics()
- Constructs a new
Graphics
object.
-
clearRect(int, int, int, int)
-
Clears the specified rectangle by filling it with the background
color of the current drawing surface.
-
clipRect(int, int, int, int)
-
Intersects the current clip with the specified rectangle.
-
copyArea(int, int, int, int, int, int)
- Copies an area of the component by a distance specified by
dx
and dy
.
-
create()
- Creates a new
Graphics
object that is
a copy of this Graphics
object.
-
create(int, int, int, int)
- Creates a new
Graphics
object based on this
Graphics
object, but with a new translation and clip area.
-
dispose()
- Disposes of this graphics context and releases
any system resources that it is using.
-
draw3DRect(int, int, int, int, boolean)
- Draws a 3-D highlighted outline of the specified rectangle.
-
drawArc(int, int, int, int, int, int)
- Draws the outline of a circular or elliptical arc
covering the specified rectangle.
-
drawBytes(byte[], int, int, int, int)
-
Draws the text given by the specified byte array, using this
graphics context's current font and color.
-
drawChars(char[], int, int, int, int)
-
Draws the text given by the specified character array, using this
graphics context's current font and color.
-
drawImage(Image, int, int, Color, ImageObserver)
-
Draws as much of the specified image as is currently available.
-
drawImage(Image, int, int, ImageObserver)
-
Draws as much of the specified image as is currently available.
-
drawImage(Image, int, int, int, int, Color, ImageObserver)
- Draws as much of the specified image as has already been scaled
to fit inside the specified rectangle.
-
drawImage(Image, int, int, int, int, ImageObserver)
- Draws as much of the specified image as has already been scaled
to fit inside the specified rectangle.
-
drawImage(Image, int, int, int, int, int, int, int, int, Color, ImageObserver)
- Draws as much of the specified area of the specified image as is
currently available, scaling it on the fly to fit inside the
specified area of the destination drawable surface.
-
drawImage(Image, int, int, int, int, int, int, int, int, ImageObserver)
- Draws as much of the specified area of the specified image as is
currently available, scaling it on the fly to fit inside the
specified area of the destination drawable surface.
-
drawLine(int, int, int, int)
-
Draws a line, using the current color, between the points
(x1, y1)
and (x2, y2)
in this graphics context's coordinate system.
-
drawOval(int, int, int, int)
-
Draws the outline of an oval.
-
drawPolygon(int[], int[], int)
-
Draws a closed polygon defined by
arrays of x and y coordinates.
-
drawPolygon(Polygon)
-
Draws the outline of a polygon defined by the specified
Polygon
object.
-
drawPolyline(int[], int[], int)
-
Draws a sequence of connected lines defined by
arrays of x and y coordinates.
-
drawRect(int, int, int, int)
-
Draws the outline of the specified rectangle.
-
drawRoundRect(int, int, int, int, int, int)
-
Draws an outlined round-cornered rectangle using this graphics
context's current color.
-
drawString(String, int, int)
-
Draws the text given by the specified string, using this
graphics context's current font and color.
-
fill3DRect(int, int, int, int, boolean)
- Paints a 3-D highlighted rectangle filled with the current color.
-
fillArc(int, int, int, int, int, int)
-
Fills a circular or elliptical arc covering the specified rectangle.
-
fillOval(int, int, int, int)
-
Fills an oval bounded by the specified rectangle with the
current color.
-
fillPolygon(int[], int[], int)
-
Fills a closed polygon defined by
arrays of x and y coordinates.
-
fillPolygon(Polygon)
-
Fills the polygon defined by the specified Polygon object with
the graphics context's current color.
-
fillRect(int, int, int, int)
-
Fills the specified rectangle.
-
fillRoundRect(int, int, int, int, int, int)
-
Fills the specified rounded corner rectangle with the current color.
-
finalize()
- Disposes of this graphics context once it is no longer referenced.
-
getClip()
- Gets the current clipping area.
-
getClipBounds()
- Returns the bounding rectangle of the current clipping area.
-
getClipRect()
-
Deprecated.
-
getColor()
- Gets this graphics context's current color.
-
getFont()
- Gets the current font.
-
getFontMetrics()
- Gets the font metrics of the current font.
-
getFontMetrics(Font)
- Gets the font metrics for the specified font.
-
setClip(int, int, int, int)
- Sets the current clip to the rectangle specified by the given
coordinates.
-
setClip(Shape)
- Sets the current clipping area to an arbitrary clip shape.
-
setColor(Color)
- Sets this graphics context's current color to the specified
color.
-
setFont(Font)
- Sets this graphics context's font to the specified font.
-
setPaintMode()
- Sets the paint mode of this graphics context to overwrite the
destination with this graphics context's current color.
-
setXORMode(Color)
- Sets the paint mode of this graphics context to alternate between
this graphics context's current color and the new specified color.
-
toString()
- Returns a
String
object representing this
Graphics
object's value.
-
translate(int, int)
- Translates the origin of the graphics context to the point
(x, y) in the current coordinate system.
Graphics
protected Graphics()
- Constructs a new
Graphics
object.
This constructor is the default contructor for a graphics
context.
Since Graphics
is an abstract class, applications
cannot call this constructor directly. Graphics contexts are
obtained from other graphics contexts or are created by calling
getGraphics
on a component.
- See Also:
- create, getGraphics
create
public abstract Graphics create()
- Creates a new
Graphics
object that is
a copy of this Graphics
object.
- Returns:
- a new graphics context that is a copy of
this graphics context.
create
public Graphics create(int x,
int y,
int width,
int height)
- Creates a new
Graphics
object based on this
Graphics
object, but with a new translation and clip area.
The new Graphics
object has its origin
translated to the specified point (x, y).
Its clip area is determined by the intersection of the original
clip area with the specified rectangle. The arguments are all
interpreted in the coordinate system of the original
Graphics
object. The new graphics context is
identical to the original, except in two respects:
-
The new graphics context is translated by (x, y).
That is to say, the point (
0
, 0
) in the
new graphics context is the same as (x, y) in
the original graphics context.
-
The new graphics context has an additional clipping rectangle, in
addition to whatever (translated) clipping rectangle it inherited
from the original graphics context. The origin of the new clipping
rectangle is at (
0
, 0
), and its size
is specified by the width
and height
arguments.
- Parameters:
- x - the x coordinate.
- y - the y coordinate.
- width - the width of the clipping rectangle.
- height - the height of the clipping rectangle.
- Returns:
- a new graphics context.
- See Also:
- translate, clipRect
translate
public abstract void translate(int x,
int y)
- Translates the origin of the graphics context to the point
(x, y) in the current coordinate system.
Modifies this graphics context so that its new origin corresponds
to the point (x, y) in this graphics context's
original coordinate system. All coordinates used in subsequent
rendering operations on this graphics context will be relative
to this new origin.
- Parameters:
- x - the x coordinate.
- y - the y coordinate.
getColor
public abstract Color getColor()
- Gets this graphics context's current color.
- Returns:
- this graphics context's current color.
- See Also:
- Color, setColor
setColor
public abstract void setColor(Color c)
- Sets this graphics context's current color to the specified
color. All subsequent graphics operations using this graphics
context use this specified color.
- Parameters:
- c - the new rendering color.
- See Also:
- Color, getColor
setPaintMode
public abstract void setPaintMode()
- Sets the paint mode of this graphics context to overwrite the
destination with this graphics context's current color.
This sets the logical pixel operation function to the paint or
overwrite mode. All subsequent rendering operations will
overwrite the destination with the current color.
setXORMode
public abstract void setXORMode(Color c1)
- Sets the paint mode of this graphics context to alternate between
this graphics context's current color and the new specified color.
This specifies that logical pixel operations are performed in the
XOR mode, which alternates pixels between the current color and
a specified XOR color.
When drawing operations are performed, pixels which are the
current color are changed to the specified color, and vice versa.
Pixels that are of colors other than those two colors are changed
in an unpredictable but reversible manner; if the same figure is
drawn twice, then all pixels are restored to their original values.
- Parameters:
- c1 - the XOR alternation color
getFont
public abstract Font getFont()
- Gets the current font.
- Returns:
- this graphics context's current font.
- See Also:
- Font, setFont
setFont
public abstract void setFont(Font font)
- Sets this graphics context's font to the specified font.
All subsequent text operations using this graphics context
use this font.
- Parameters:
- font - the font.
- See Also:
- getFont, drawChars, drawString, drawBytes
getFontMetrics
public FontMetrics getFontMetrics()
- Gets the font metrics of the current font.
- Returns:
- the font metrics of this graphics
context's current font.
- See Also:
- getFont, FontMetrics, getFontMetrics
getFontMetrics
public abstract FontMetrics getFontMetrics(Font f)
- Gets the font metrics for the specified font.
- Parameters:
- f - the specified font
- Returns:
- the font metrics for the specified font.
- See Also:
- getFont, FontMetrics, getFontMetrics
getClipBounds
public abstract Rectangle getClipBounds()
- Returns the bounding rectangle of the current clipping area.
The coordinates in the rectangle are relative to the coordinate
system origin of this graphics context.
- Returns:
- the bounding rectangle of the current clipping area.
- See Also:
- getClip, clipRect, setClip, setClip
clipRect
public abstract void clipRect(int x,
int y,
int width,
int height)
- Intersects the current clip with the specified rectangle.
The resulting clipping area is the intersection of the current
clipping area and the specified rectangle.
This method can only be used to make the current clip smaller.
To set the current clip larger, use any of the setClip methods.
Rendering operations have no effect outside of the clipping area.
- Parameters:
- x - the x coordinate of the rectangle to intersect the clip with
- y - the y coordinate of the rectangle to intersect the clip with
- width - the width of the rectangle to intersect the clip with
- height - the height of the rectangle to intersect the clip with
- See Also:
- setClip, setClip
setClip
public abstract void setClip(int x,
int y,
int width,
int height)
- Sets the current clip to the rectangle specified by the given
coordinates.
Rendering operations have no effect outside of the clipping area.
- Parameters:
- x - the x coordinate of the new clip rectangle.
- y - the y coordinate of the new clip rectangle.
- width - the width of the new clip rectangle.
- height - the height of the new clip rectangle.
- See Also:
- clipRect, setClip
getClip
public abstract Shape getClip()
- Gets the current clipping area.
- Returns:
- a
Shape
object representing the
current clipping area.
- See Also:
- getClipBounds, clipRect, setClip, setClip
setClip
public abstract void setClip(Shape clip)
- Sets the current clipping area to an arbitrary clip shape.
Not all objects which implement the
Shape
interface can be used to set the clip. The only
Shape
objects which are guaranteed to be
supported are Shape
objects which are
obtained via the getClip
method and via
Rectangle
objects.
- See Also:
- getClip, clipRect, setClip
copyArea
public abstract void copyArea(int x,
int y,
int width,
int height,
int dx,
int dy)
- Copies an area of the component by a distance specified by
dx
and dy
. From the point specified
by x
and y
, this method
copies downwards and to the right. To copy an area of the
component to the left or upwards, specify a negative value for
dx
or dy
.
If a portion of the source rectangle lies outside the bounds
of the component, or is obscured by another window or component,
copyArea
will be unable to copy the associated
pixels. The area that is omitted can be refreshed by calling
the component's paint
method.
- Parameters:
- x - the x coordinate of the source rectangle.
- y - the y coordinate of the source rectangle.
- width - the width of the source rectangle.
- height - the height of the source rectangle.
- dx - the horizontal distance to copy the pixels.
- dy - the vertical distance to copy the pixels.
drawLine
public abstract void drawLine(int x1,
int y1,
int x2,
int y2)
- Draws a line, using the current color, between the points
(x1, y1)
and (x2, y2)
in this graphics context's coordinate system.
- Parameters:
- x1 - the first point's x coordinate.
- y1 - the first point's y coordinate.
- x2 - the second point's x coordinate.
- y2 - the second point's y coordinate.
fillRect
public abstract void fillRect(int x,
int y,
int width,
int height)
- Fills the specified rectangle.
The left and right edges of the rectangle are at
x
and x + width - 1
.
The top and bottom edges are at
y
and y + height - 1
.
The resulting rectangle covers an area
width
pixels wide by
height
pixels tall.
The rectangle is filled using the graphics context's current color.
- Parameters:
- x - the x coordinate
of the rectangle to be filled.
- y - the y coordinate
of the rectangle to be filled.
- width - the width of the rectangle to be filled.
- height - the height of the rectangle to be filled.
- See Also:
- fillRect, clearRect
drawRect
public void drawRect(int x,
int y,
int width,
int height)
- Draws the outline of the specified rectangle.
The left and right edges of the rectangle are at
x
and x + width
.
The top and bottom edges are at
y
and y + height
.
The rectangle is drawn using the graphics context's current color.
- Parameters:
- x - the x coordinate
of the rectangle to be drawn.
- y - the y coordinate
of the rectangle to be drawn.
- width - the width of the rectangle to be drawn.
- height - the height of the rectangle to be drawn.
- See Also:
- fillRect, clearRect
clearRect
public abstract void clearRect(int x,
int y,
int width,
int height)
- Clears the specified rectangle by filling it with the background
color of the current drawing surface. This operation does not
use the current paint mode.
Beginning with Java 1.1, the background color
of offscreen images may be system dependent. Applications should
use setColor
followed by fillRect
to
ensure that an offscreen image is cleared to a specific color.
- Parameters:
- x - the x coordinate of the rectangle to clear.
- y - the y coordinate of the rectangle to clear.
- width - the width of the rectangle to clear.
- height - the height of the rectangle to clear.
- See Also:
- fillRect, drawRect, setColor, setPaintMode, setXORMode
drawRoundRect
public abstract void drawRoundRect(int x,
int y,
int width,
int height,
int arcWidth,
int arcHeight)
- Draws an outlined round-cornered rectangle using this graphics
context's current color. The left and right edges of the rectangle
are at
x
and x + width
,
respectively. The top and bottom edges of the rectangle are at
y
and y + height
.
- Parameters:
- x - the x coordinate of the rectangle to be drawn.
- y - the y coordinate of the rectangle to be drawn.
- width - the width of the rectangle to be drawn.
- height - the height of the rectangle to be drawn.
- arcWidth - the horizontal diameter of the arc
at the four corners.
- arcHeight - the vertical diameter of the arc
at the four corners.
- See Also:
- fillRoundRect
fillRoundRect
public abstract void fillRoundRect(int x,
int y,
int width,
int height,
int arcWidth,
int arcHeight)
- Fills the specified rounded corner rectangle with the current color.
The left and right edges of the rectangle
are at
x
and x + width - 1
,
respectively. The top and bottom edges of the rectangle are at
y
and y + height - 1
.
- Parameters:
- x - the x coordinate of the rectangle to be filled.
- y - the y coordinate of the rectangle to be filled.
- width - the width of the rectangle to be filled.
- height - the height of the rectangle to be filled.
- arcWidth - the horizontal diameter
of the arc at the four corners.
- arcHeight - the vertical diameter
of the arc at the four corners.
- See Also:
- drawRoundRect
draw3DRect
public void draw3DRect(int x,
int y,
int width,
int height,
boolean raised)
- Draws a 3-D highlighted outline of the specified rectangle.
The edges of the rectangle are highlighted so that they
appear to be beveled and lit from the upper left corner.
The colors used for the highlighting effect are determined
based on the current color.
The resulting rectangle covers an area that is
width + 1
pixels wide
by height + 1
pixels tall.
- Parameters:
- x - the x coordinate of the rectangle to be drawn.
- y - the y coordinate of the rectangle to be drawn.
- width - the width of the rectangle to be drawn.
- height - the height of the rectangle to be drawn.
- raised - a boolean that determines whether the rectangle
appears to be raised above the surface
or sunk into the surface.
- See Also:
- fill3DRect
fill3DRect
public void fill3DRect(int x,
int y,
int width,
int height,
boolean raised)
- Paints a 3-D highlighted rectangle filled with the current color.
The edges of the rectangle will be highlighted so that it appears
as if the edges were beveled and lit from the upper left corner.
The colors used for the highlighting effect will be determined from
the current color.
- Parameters:
- x - the x coordinate of the rectangle to be filled.
- y - the y coordinate of the rectangle to be filled.
- width - the width of the rectangle to be filled.
- height - the height of the rectangle to be filled.
- raised - a boolean value that determines whether the
rectangle appears to be raised above the surface
or etched into the surface.
- See Also:
- draw3DRect
drawOval
public abstract void drawOval(int x,
int y,
int width,
int height)
- Draws the outline of an oval.
The result is a circle or ellipse that fits within the
rectangle specified by the
x
, y
,
width
, and height
arguments.
The oval covers an area that is
width + 1
pixels wide
and height + 1 pixels tall.
- Parameters:
- x - the x coordinate of the upper left
corner of the oval to be drawn.
- y - the y coordinate of the upper left
corner of the oval to be drawn.
- width - the width of the oval to be drawn.
- height - the height of the oval to be drawn.
- See Also:
- fillOval
fillOval
public abstract void fillOval(int x,
int y,
int width,
int height)
- Fills an oval bounded by the specified rectangle with the
current color.
- Parameters:
- x - the x coordinate of the upper left corner
of the oval to be filled.
- y - the y coordinate of the upper left corner
of the oval to be filled.
- width - the width of the oval to be filled.
- height - the height of the oval to be filled.
- See Also:
- drawOval
drawArc
public abstract void drawArc(int x,
int y,
int width,
int height,
int startAngle,
int arcAngle)
- Draws the outline of a circular or elliptical arc
covering the specified rectangle.
The resulting arc begins at startAngle
and extends
for arcAngle
degrees, using the current color.
Angles are interpreted such that 0 degrees
is at the 3 o'clock position.
A positive value indicates a counter-clockwise rotation
while a negative value indicates a clockwise rotation.
The center of the arc is the center of the rectangle whose origin
is (x, y) and whose size is specified by the
width
and height
arguments.
The resulting arc covers an area
width + 1
pixels wide
by height + 1
pixels tall.
- Parameters:
- x - the x coordinate of the
upper-left corner of the arc to be drawn.
- y - the y coordinate of the
upper-left corner of the arc to be drawn.
- width - the width of the arc to be drawn.
- height - the height of the arc to be drawn.
- startAngle - the beginning angle.
- arcAngle - the angular extent of the arc,
relative to the start angle.
- See Also:
- fillArc
fillArc
public abstract void fillArc(int x,
int y,
int width,
int height,
int startAngle,
int arcAngle)
- Fills a circular or elliptical arc covering the specified rectangle.
The resulting arc begins at startAngle
and extends
for arcAngle
degrees.
Angles are interpreted such that 0 degrees
is at the 3 o'clock position.
A positive value indicates a counter-clockwise rotation
while a negative value indicates a clockwise rotation.
The center of the arc is the center of the rectangle whose origin
is (x, y) and whose size is specified by the
width
and height
arguments.
The resulting arc covers an area
width + 1
pixels wide
by height + 1
pixels tall.
- Parameters:
- x - the x coordinate of the
upper-left corner of the arc to be filled.
- y - the y coordinate of the
upper-left corner of the arc to be filled.
- width - the width of the arc to be filled.
- height - the height of the arc to be filled.
- startAngle - the beginning angle.
- arcAngle - the angular extent of the arc,
relative to the start angle.
- See Also:
- drawArc
drawPolyline
public abstract void drawPolyline(int xPoints[],
int yPoints[],
int nPoints)
- Draws a sequence of connected lines defined by
arrays of x and y coordinates.
Each pair of (x, y) coordinates defines a point.
The figure is not closed if the first point
differs from the last point.
- Parameters:
- xPoints - an array of x points
- yPoints - an array of y points
- nPoints - the total number of points
- See Also:
- drawPolygon
drawPolygon
public abstract void drawPolygon(int xPoints[],
int yPoints[],
int nPoints)
- Draws a closed polygon defined by
arrays of x and y coordinates.
Each pair of (x, y) coordinates defines a point.
This method draws the polygon defined by nPoint
line
segments, where the first nPoint - 1
line segments are line segments from
(xPoints[i - 1], yPoints[i - 1])
to (xPoints[i], yPoints[i])
, for
1 ≤ i ≤ nPoints
.
The figure is automatically closed by drawing a line connecting
the final point to the first point, if those points are different.
- Parameters:
- xPoints - a an array of
x
coordinates.
- yPoints - a an array of
y
coordinates.
- nPoints - a the total number of points.
- See Also:
- fillPolygon, drawPolyline
drawPolygon
public void drawPolygon(Polygon p)
- Draws the outline of a polygon defined by the specified
Polygon
object.
- Parameters:
- p - the polygon to draw.
- See Also:
- fillPolygon, drawPolyline
fillPolygon
public abstract void fillPolygon(int xPoints[],
int yPoints[],
int nPoints)
- Fills a closed polygon defined by
arrays of x and y coordinates.
This method draws the polygon defined by nPoint
line
segments, where the first nPoint - 1
line segments are line segments from
(xPoints[i - 1], yPoints[i - 1])
to (xPoints[i], yPoints[i])
, for
1 ≤ i ≤ nPoints
.
The figure is automatically closed by drawing a line connecting
the final point to the first point, if those points are different.
The area inside the polygon is defined using an
even-odd fill rule, also known as the alternating rule.
- Parameters:
- xPoints - a an array of
x
coordinates.
- yPoints - a an array of
y
coordinates.
- nPoints - a the total number of points.
- See Also:
- drawPolygon
fillPolygon
public void fillPolygon(Polygon p)
- Fills the polygon defined by the specified Polygon object with
the graphics context's current color.
The area inside the polygon is defined using an
even-odd fill rule, also known as the alternating rule.
- Parameters:
- p - the polygon to fill.
- See Also:
- drawPolygon
drawString
public abstract void drawString(String str,
int x,
int y)
- Draws the text given by the specified string, using this
graphics context's current font and color. The baseline of the
first character is at position (x, y) in this
graphics context's coordinate system.
- Parameters:
- str - the string to be drawn.
- x - the x coordinate.
- y - the y coordinate.
- See Also:
- drawBytes, drawChars
drawChars
public void drawChars(char data[],
int offset,
int length,
int x,
int y)
- Draws the text given by the specified character array, using this
graphics context's current font and color. The baseline of the
first character is at position (x, y) in this
graphics context's coordinate system.
- Parameters:
- data - the array of characters to be drawn
- offset - the start offset in the data
- length - the number of characters to be drawn
- x - the x coordinate of the baseline of the text
- y - the y coordinate of the baseline of the text
- See Also:
- drawBytes, drawString
drawBytes
public void drawBytes(byte data[],
int offset,
int length,
int x,
int y)
- Draws the text given by the specified byte array, using this
graphics context's current font and color. The baseline of the
first character is at position (x, y) in this
graphics context's coordinate system.
- Parameters:
- data - the data to be drawn
- offset - the start offset in the data
- length - the number of bytes that are drawn
- x - the x coordinate of the baseline of the text
- y - the y coordinate of the baseline of the text
- See Also:
- drawChars, drawString
drawImage
public abstract boolean drawImage(Image img,
int x,
int y,
ImageObserver observer)
- Draws as much of the specified image as is currently available.
The image is drawn with its top-left corner at
(x, y) in this graphics context's coordinate
space. Transparent pixels in the image do not affect whatever
pixels are already there.
This method returns immediately in all cases, even if the
complete image has not yet been loaded, and it has not been dithered
and converted for the current output device.
If the image has not yet been completely loaded, then
drawImage
returns false
. As more of
the image becomes available, the process that draws the image notifies
the specified image observer.
- Parameters:
- img - the specified image to be drawn.
- x - the x coordinate.
- y - the y coordinate.
- observer - object to be notified as more of
the image is converted.
- See Also:
- Image, ImageObserver, imageUpdate
drawImage
public abstract boolean drawImage(Image img,
int x,
int y,
int width,
int height,
ImageObserver observer)
- Draws as much of the specified image as has already been scaled
to fit inside the specified rectangle.
The image is drawn inside the specified rectangle of this
graphics context's coordinate space, and is scaled if
necessary. Transparent pixels do not affect whatever pixels
are already there.
This method returns immediately in all cases, even if the
entire image has not yet been scaled, dithered, and converted
for the current output device.
If the current output representation is not yet complete, then
drawImage
returns false
. As more of
the image becomes available, the process that draws the image notifies
the image observer by calling its imageUpdate
method.
A scaled version of an image will not necessarily be
available immediately just because an unscaled version of the
image has been constructed for this output device. Each size of
the image may be cached separately and generated from the original
data in a separate image production sequence.
- Parameters:
- img - the specified image to be drawn.
- x - the x coordinate.
- y - the y coordinate.
- width - the width of the rectangle.
- height - the height of the rectangle.
- observer - object to be notified as more of
the image is converted.
- See Also:
- Image, ImageObserver, imageUpdate
drawImage
public abstract boolean drawImage(Image img,
int x,
int y,
Color bgcolor,
ImageObserver observer)
- Draws as much of the specified image as is currently available.
The image is drawn with its top-left corner at
(x, y) in this graphics context's coordinate
space. Transparent pixels are drawn in the specified
background color.
This operation is equivalent to filling a rectangle of the
width and height of the specified image with the given color and then
drawing the image on top of it, but possibly more efficient.
This method returns immediately in all cases, even if the
complete image has not yet been loaded, and it has not been dithered
and converted for the current output device.
If the image has not yet been completely loaded, then
drawImage
returns false
. As more of
the image becomes available, the process that draws the image notifies
the specified image observer.
- Parameters:
- img - the specified image to be drawn.
- x - the x coordinate.
- y - the y coordinate.
- bgcolor - the background color to paint under the
non-opaque portions of the image.
- observer - object to be notified as more of
the image is converted.
- See Also:
- Image, ImageObserver, imageUpdate
drawImage
public abstract boolean drawImage(Image img,
int x,
int y,
int width,
int height,
Color bgcolor,
ImageObserver observer)
- Draws as much of the specified image as has already been scaled
to fit inside the specified rectangle.
The image is drawn inside the specified rectangle of this
graphics context's coordinate space, and is scaled if
necessary. Transparent pixels are drawn in the specified
background color.
This operation is equivalent to filling a rectangle of the
width and height of the specified image with the given color and then
drawing the image on top of it, but possibly more efficient.
This method returns immediately in all cases, even if the
entire image has not yet been scaled, dithered, and converted
for the current output device.
If the current output representation is not yet complete then
drawImage
returns false
. As more of
the image becomes available, the process that draws the image notifies
the specified image observer.
A scaled version of an image will not necessarily be
available immediately just because an unscaled version of the
image has been constructed for this output device. Each size of
the image may be cached separately and generated from the original
data in a separate image production sequence.
- Parameters:
- img - the specified image to be drawn.
- x - the x coordinate.
- y - the y coordinate.
- width - the width of the rectangle.
- height - the height of the rectangle.
- bgcolor - the background color to paint under the
non-opaque portions of the image.
- observer - object to be notified as more of
the image is converted.
- See Also:
- Image, ImageObserver, imageUpdate
drawImage
public abstract boolean drawImage(Image img,
int dx1,
int dy1,
int dx2,
int dy2,
int sx1,
int sy1,
int sx2,
int sy2,
ImageObserver observer)
- Draws as much of the specified area of the specified image as is
currently available, scaling it on the fly to fit inside the
specified area of the destination drawable surface. Transparent pixels
do not affect whatever pixels are already there.
This method returns immediately in all cases, even if the
image area to be drawn has not yet been scaled, dithered, and converted
for the current output device.
If the current output representation is not yet complete then
drawImage
returns false
. As more of
the image becomes available, the process that draws the image notifies
the specified image observer.
This method always uses the unscaled version of the image
to render the scaled rectangle and performs the required
scaling on the fly. It does not use a cached, scaled version
of the image for this operation. Scaling of the image from source
to destination is performed such that the first coordinate
of the source rectangle is mapped to the first coordinate of
the destination rectangle, and the second source coordinate is
mapped to the second destination coordinate. The subimage is
scaled and flipped as needed to preserve those mappings.
- Parameters:
- img - the specified image to be drawn
- dx1 - the x coordinate of the first corner of the
destination rectangle.
- dy1 - the y coordinate of the first corner of the
destination rectangle.
- dx2 - the x coordinate of the second corner of the
destination rectangle.
- dy2 - the y coordinate of the second corner of the
destination rectangle.
- sx1 - the x coordinate of the first corner of the
source rectangle.
- sy1 - the y coordinate of the first corner of the
source rectangle.
- sx2 - the x coordinate of the second corner of the
source rectangle.
- sy2 - the y coordinate of the second corner of the
source rectangle.
- observer - object to be notified as more of the image is
scaled and converted.
- See Also:
- Image, ImageObserver, imageUpdate
drawImage
public abstract boolean drawImage(Image img,
int dx1,
int dy1,
int dx2,
int dy2,
int sx1,
int sy1,
int sx2,
int sy2,
Color bgcolor,
ImageObserver observer)
- Draws as much of the specified area of the specified image as is
currently available, scaling it on the fly to fit inside the
specified area of the destination drawable surface.
Transparent pixels are drawn in the specified background color.
This operation is equivalent to filling a rectangle of the
width and height of the specified image with the given color and then
drawing the image on top of it, but possibly more efficient.
This method returns immediately in all cases, even if the
image area to be drawn has not yet been scaled, dithered, and converted
for the current output device.
If the current output representation is not yet complete then
drawImage
returns false
. As more of
the image becomes available, the process that draws the image notifies
the specified image observer.
This method always uses the unscaled version of the image
to render the scaled rectangle and performs the required
scaling on the fly. It does not use a cached, scaled version
of the image for this operation. Scaling of the image from source
to destination is performed such that the first coordinate
of the source rectangle is mapped to the first coordinate of
the destination rectangle, and the second source coordinate is
mapped to the second destination coordinate. The subimage is
scaled and flipped as needed to preserve those mappings.
- Parameters:
- img - the specified image to be drawn
- dx1 - the x coordinate of the first corner of the
destination rectangle.
- dy1 - the y coordinate of the first corner of the
destination rectangle.
- dx2 - the x coordinate of the second corner of the
destination rectangle.
- dy2 - the y coordinate of the second corner of the
destination rectangle.
- sx1 - the x coordinate of the first corner of the
source rectangle.
- sy1 - the y coordinate of the first corner of the
source rectangle.
- sx2 - the x coordinate of the second corner of the
source rectangle.
- sy2 - the y coordinate of the second corner of the
source rectangle.
- bgcolor - the background color to paint under the
non-opaque portions of the image.
- observer - object to be notified as more of the image is
scaled and converted.
- See Also:
- Image, ImageObserver, imageUpdate
dispose
public abstract void dispose()
- Disposes of this graphics context and releases
any system resources that it is using.
A
Graphics
object cannot be used after
dispose
has been called.
When a Java program runs, a large number of Graphics
objects can be created within a short time frame.
Although the finalization process of the garbage collector
also disposes of the same system resources, it is preferable
to manually free the associated resources by calling this
method rather than to rely on a finalization process which
may not run to completion for a long period of time.
Graphics objects which are provided as arguments to the
paint
and update
methods
of components are automatically released by the system when
those methods return. For efficiency, programmers should
call dispose
when finished using
a Graphics
object only if it was created
directly from a component or another Graphics
object.
- See Also:
- finalize, paint, update, getGraphics, create
finalize
public void finalize()
- Disposes of this graphics context once it is no longer referenced.
- Overrides:
- finalize in class Object
- See Also:
- dispose
toString
public String toString()
- Returns a
String
object representing this
Graphics
object's value.
- Returns:
- a string representation of this graphics context.
- Overrides:
- toString in class Object
getClipRect
public Rectangle getClipRect()
- Note: getClipRect() is deprecated.
As of JDK version 1.1,
replaced by
getClipBounds()
.
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