java.awt.Graphics Maven / Gradle / Ivy

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Sun Microsystems Inc. owns the copyright in this file and it is provided to you for informative, as opposed to normative, use. The file and any files generated from it may be used to generate other informative documentation, such as a unified set of documents of API signatures for a platform that includes technologies expressed as Java APIs. The file may also be used to produce "compilation stubs," which allow applications to be compiled and validated for such platforms.

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This work corresponds to the API signatures of JSR 217: Personal Basis Profile 1.1. In the event of a discrepency between this work and the JSR 217 specification, which is available at http://www.jcp.org/en/jsr/detail?id=217, the latter takes precedence. */ package java.awt; import java.io.*; import java.util.*; import java.awt.image.ImageObserver; import java.text.AttributedCharacterIterator; /** * 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 {@link Graphics#setXORMode}). *

* Coordinates are infinitely thin and lie between the pixels of the * output device. * Operations that 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 that fill a figure operate by filling the interior * of that infinitely thin path. * Operations that 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 that 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 the current clip, which is specified by a {@link Shape} * in user space and is controlled by the program using the * Graphics object. This user clip * is transformed into device space and combined with the * device clip, which is defined by the visibility of windows and * device extents. The combination of the user clip and device clip * defines the composite clip, which determines the final clipping * region. The user clip cannot be modified by the rendering * system to reflect the resulting composite clip. The user clip can only * be changed through the setClip or clipRect * methods. * All drawing or writing is done in the current color, * using the current paint mode, and in the current font. * * @version 1.65, 01/23/03 * @author Sami Shaio * @author Arthur van Hoff * @see java.awt.Component * @see java.awt.Graphics#clipRect(int, int, int, int) * @see java.awt.Graphics#setColor(java.awt.Color) * @see java.awt.Graphics#setPaintMode() * @see java.awt.Graphics#setXORMode(java.awt.Color) * @see java.awt.Graphics#setFont(java.awt.Font) * @since JDK1.0 */ public abstract class 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 java.awt.Graphics#create() * @see java.awt.Component#getGraphics */ protected Graphics() { } /** * Creates a new Graphics object that is * a copy of this Graphics object. * @return a new graphics context that is a copy of * this graphics context. */ public abstract Graphics create(); /** * 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. *

* @param x the x coordinate. * @param y the y coordinate. * @param width the width of the clipping rectangle. * @param height the height of the clipping rectangle. * @return a new graphics context. * @see java.awt.Graphics#translate * @see java.awt.Graphics#clipRect */ public Graphics create(int x, int y, int width, int height) { return null;} /** * 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. * @param x the x coordinate. * @param y the y coordinate. */ public abstract void translate(int x, int y); /** * Gets this graphics context's current color. * @return this graphics context's current color. * @see java.awt.Color * @see java.awt.Graphics#setColor(Color) */ public abstract Color getColor(); /** * Sets this graphics context's current color to the specified * color. All subsequent graphics operations using this graphics * context use this specified color. * @param c the new rendering color. * @see java.awt.Color * @see java.awt.Graphics#getColor */ public abstract void setColor(Color c); /** * 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. */ public abstract void setPaintMode(); /** * 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. * @param c1 the XOR alternation color */ public abstract void setXORMode(Color c1); /** * Gets the current font. * @return this graphics context's current font. * @see java.awt.Font * @see java.awt.Graphics#setFont(Font) */ public abstract Font getFont(); /** * Sets this graphics context's font to the specified font. * All subsequent text operations using this graphics context * use this font. * @param font the font. * @see java.awt.Graphics#getFont * @see java.awt.Graphics#drawString(java.lang.String, int, int) * @see java.awt.Graphics#drawBytes(byte[], int, int, int, int) * @see java.awt.Graphics#drawChars(char[], int, int, int, int) */ public abstract void setFont(Font font); /** * Gets the font metrics of the current font. * @return the font metrics of this graphics * context's current font. * @see java.awt.Graphics#getFont * @see java.awt.FontMetrics * @see java.awt.Graphics#getFontMetrics(Font) */ public FontMetrics getFontMetrics() { return null;} /** * Gets the font metrics for the specified font. * @return the font metrics for the specified font. * @param f the specified font * @see java.awt.Graphics#getFont * @see java.awt.FontMetrics * @see java.awt.Graphics#getFontMetrics() */ public abstract FontMetrics getFontMetrics(Font f); /** * Returns the bounding rectangle of the current clipping area. * This method refers to the user clip, which is independent of the * clipping associated with device bounds and window visibility. * If no clip has previously been set, or if the clip has been * cleared using setClip(null), this method returns * null. * The coordinates in the rectangle are relative to the coordinate * system origin of this graphics context. * @return the bounding rectangle of the current clipping area, * or null if no clip is set. * @see java.awt.Graphics#getClip * @see java.awt.Graphics#clipRect * @see java.awt.Graphics#setClip(int, int, int, int) * @see java.awt.Graphics#setClip(Shape) * @since JDK1.1 */ public abstract Rectangle getClipBounds(); /** * Intersects the current clip with the specified rectangle. * The resulting clipping area is the intersection of the current * clipping area and the specified rectangle. If there is no * current clipping area, either because the clip has never been * set, or the clip has been cleared using setClip(null), * the specified rectangle becomes the new clip. * This method sets the user clip, which is independent of the * clipping associated with device bounds and window visibility. * 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. * @param x the x coordinate of the rectangle to intersect the clip with * @param y the y coordinate of the rectangle to intersect the clip with * @param width the width of the rectangle to intersect the clip with * @param height the height of the rectangle to intersect the clip with * @see #setClip(int, int, int, int) * @see #setClip(Shape) */ public abstract void clipRect(int x, int y, int width, int height); /** * Sets the current clip to the rectangle specified by the given * coordinates. This method sets the user clip, which is * independent of the clipping associated with device bounds * and window visibility. * Rendering operations have no effect outside of the clipping area. * @param x the x coordinate of the new clip rectangle. * @param y the y coordinate of the new clip rectangle. * @param width the width of the new clip rectangle. * @param height the height of the new clip rectangle. * @see java.awt.Graphics#clipRect * @see java.awt.Graphics#setClip(Shape) * @see java.awt.Graphics#getClip * @since JDK1.1 */ public abstract void setClip(int x, int y, int width, int height); /** * Gets the current clipping area. * This method returns the user clip, which is independent of the * clipping associated with device bounds and window visibility. * If no clip has previously been set, or if the clip has been * cleared using setClip(null), this method returns * null. * @return a Shape object representing the * current clipping area, or null if * no clip is set. * @see java.awt.Graphics#getClipBounds * @see java.awt.Graphics#clipRect * @see java.awt.Graphics#setClip(int, int, int, int) * @see java.awt.Graphics#setClip(Shape) * @since JDK1.1 */ public abstract Shape getClip(); /** * Sets the current clipping area to an arbitrary clip shape. * Not all objects that implement the Shape * interface can be used to set the clip. The only * Shape objects that are guaranteed to be * supported are Shape objects that are * obtained via the getClip method and via * Rectangle objects. This method sets the * user clip, which is independent of the clipping associated * with device bounds and window visibility. * @param clip the Shape to use to set the clip * @see java.awt.Graphics#getClip() * @see java.awt.Graphics#clipRect * @see java.awt.Graphics#setClip(int, int, int, int) * @since JDK1.1 */ public abstract void setClip(Shape clip); /** * 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. * @param x the x coordinate of the source rectangle. * @param y the y coordinate of the source rectangle. * @param width the width of the source rectangle. * @param height the height of the source rectangle. * @param dx the horizontal distance to copy the pixels. * @param dy the vertical distance to copy the pixels. */ public abstract void copyArea(int x, int y, int width, int height, int dx, int dy); /** * Draws a line, using the current color, between the points * (x1, y1) and (x2, y2) * in this graphics context's coordinate system. * @param x1 the first point's x coordinate. * @param y1 the first point's y coordinate. * @param x2 the second point's x coordinate. * @param y2 the second point's y coordinate. */ public abstract void drawLine(int x1, int y1, int x2, int y2); /** * 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. * @param x the x coordinate * of the rectangle to be filled. * @param y the y coordinate * of the rectangle to be filled. * @param width the width of the rectangle to be filled. * @param height the height of the rectangle to be filled. * @see java.awt.Graphics#clearRect * @see java.awt.Graphics#drawRect */ public abstract void fillRect(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. * @param x the x coordinate * of the rectangle to be drawn. * @param y the y coordinate * of the rectangle to be drawn. * @param width the width of the rectangle to be drawn. * @param height the height of the rectangle to be drawn. * @see java.awt.Graphics#fillRect * @see java.awt.Graphics#clearRect */ public void drawRect(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. * @param x the x coordinate of the rectangle to clear. * @param y the y coordinate of the rectangle to clear. * @param width the width of the rectangle to clear. * @param height the height of the rectangle to clear. * @see java.awt.Graphics#fillRect(int, int, int, int) * @see java.awt.Graphics#drawRect * @see java.awt.Graphics#setColor(java.awt.Color) * @see java.awt.Graphics#setPaintMode * @see java.awt.Graphics#setXORMode(java.awt.Color) */ public abstract void clearRect(int x, int y, int width, int height); /** * 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. * @param x the x coordinate of the rectangle to be drawn. * @param y the y coordinate of the rectangle to be drawn. * @param width the width of the rectangle to be drawn. * @param height the height of the rectangle to be drawn. * @param arcWidth the horizontal diameter of the arc * at the four corners. * @param arcHeight the vertical diameter of the arc * at the four corners. * @see java.awt.Graphics#fillRoundRect */ public abstract void drawRoundRect(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. * @param x the x coordinate of the rectangle to be filled. * @param y the y coordinate of the rectangle to be filled. * @param width the width of the rectangle to be filled. * @param height the height of the rectangle to be filled. * @param arcWidth the horizontal diameter * of the arc at the four corners. * @param arcHeight the vertical diameter * of the arc at the four corners. * @see java.awt.Graphics#drawRoundRect */ public abstract void fillRoundRect(int x, int y, int width, int height, int arcWidth, int arcHeight); /** * 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. * @param x the x coordinate of the rectangle to be drawn. * @param y the y coordinate of the rectangle to be drawn. * @param width the width of the rectangle to be drawn. * @param height the height of the rectangle to be drawn. * @param raised a boolean that determines whether the rectangle * appears to be raised above the surface * or sunk into the surface. * @see java.awt.Graphics#fill3DRect */ public void draw3DRect(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. * @param x the x coordinate of the rectangle to be filled. * @param y the y coordinate of the rectangle to be filled. * @param width the width of the rectangle to be filled. * @param height the height of the rectangle to be filled. * @param raised a boolean value that determines whether the * rectangle appears to be raised above the surface * or etched into the surface. * @see java.awt.Graphics#draw3DRect */ public void fill3DRect(int x, int y, int width, int height, boolean raised) { } /** * 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. * @param x the x coordinate of the upper left * corner of the oval to be drawn. * @param y the y coordinate of the upper left * corner of the oval to be drawn. * @param width the width of the oval to be drawn. * @param height the height of the oval to be drawn. * @see java.awt.Graphics#fillOval */ public abstract void drawOval(int x, int y, int width, int height); /** * Fills an oval bounded by the specified rectangle with the * current color. * @param x the x coordinate of the upper left corner * of the oval to be filled. * @param y the y coordinate of the upper left corner * of the oval to be filled. * @param width the width of the oval to be filled. * @param height the height of the oval to be filled. * @see java.awt.Graphics#drawOval */ public abstract void fillOval(int x, int y, int width, int height); /** * 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. *

* The angles are specified relative to the non-square extents of * the bounding rectangle such that 45 degrees always falls on the * line from the center of the ellipse to the upper right corner of * the bounding rectangle. As a result, if the bounding rectangle is * noticeably longer in one axis than the other, the angles to the * start and end of the arc segment will be skewed farther along the * longer axis of the bounds. * @param x the x coordinate of the * upper-left corner of the arc to be drawn. * @param y the y coordinate of the * upper-left corner of the arc to be drawn. * @param width the width of the arc to be drawn. * @param height the height of the arc to be drawn. * @param startAngle the beginning angle. * @param arcAngle the angular extent of the arc, * relative to the start angle. * @see java.awt.Graphics#fillArc */ public abstract void drawArc(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. *

* The angles are specified relative to the non-square extents of * the bounding rectangle such that 45 degrees always falls on the * line from the center of the ellipse to the upper right corner of * the bounding rectangle. As a result, if the bounding rectangle is * noticeably longer in one axis than the other, the angles to the * start and end of the arc segment will be skewed farther along the * longer axis of the bounds. * @param x the x coordinate of the * upper-left corner of the arc to be filled. * @param y the y coordinate of the * upper-left corner of the arc to be filled. * @param width the width of the arc to be filled. * @param height the height of the arc to be filled. * @param startAngle the beginning angle. * @param arcAngle the angular extent of the arc, * relative to the start angle. * @see java.awt.Graphics#drawArc */ public abstract void fillArc(int x, int y, int width, int height, int startAngle, int arcAngle); /** * 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. * @param xPoints an array of x points * @param yPoints an array of y points * @param nPoints the total number of points * @see java.awt.Graphics#drawPolygon(int[], int[], int) * @since JDK1.1 */ public abstract void drawPolyline(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. * @param xPoints a an array of x coordinates. * @param yPoints a an array of y coordinates. * @param nPoints a the total number of points. * @see java.awt.Graphics#fillPolygon * @see java.awt.Graphics#drawPolyline */ public abstract void drawPolygon(int[] xPoints, int[] yPoints, int nPoints); /** * Draws the outline of a polygon defined by the specified * Polygon object. * @param p the polygon to draw. * @see java.awt.Graphics#fillPolygon * @see java.awt.Graphics#drawPolyline */ public void drawPolygon(Polygon p) { } /** * 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. * @param xPoints a an array of x coordinates. * @param yPoints a an array of y coordinates. * @param nPoints a the total number of points. * @see java.awt.Graphics#drawPolygon(int[], int[], int) */ public abstract void fillPolygon(int[] xPoints, int[] yPoints, int nPoints); /** * 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. * @param p the polygon to fill. * @see java.awt.Graphics#drawPolygon(int[], int[], int) */ public void fillPolygon(Polygon p) { } /** * Draws the text given by the specified string, using this * graphics context's current font and color. The baseline of the * leftmost character is at position (x, y) in this * graphics context's coordinate system. * @param str the string to be drawn. * @param x the x coordinate. * @param y the y coordinate. * @see java.awt.Graphics#drawBytes * @see java.awt.Graphics#drawChars */ public abstract void drawString(String str, int x, int y); /** * Draws the text given by the specified iterator, using this * graphics context's current color. The iterator has to specify a font * for each character. The baseline of the * leftmost character is at position (x, y) in this * graphics context's coordinate system. * @param iterator the iterator whose text is to be drawn * @param x the x coordinate. * @param y the y coordinate. * @see java.awt.Graphics#drawBytes * @see java.awt.Graphics#drawChars */ public abstract void drawString(AttributedCharacterIterator iterator, 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. * @param data the array of characters to be drawn * @param offset the start offset in the data * @param length the number of characters to be drawn * @param x the x coordinate of the baseline of the text * @param y the y coordinate of the baseline of the text * @see java.awt.Graphics#drawBytes * @see java.awt.Graphics#drawString */ public void drawChars(char[] 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. * @param data the data to be drawn * @param offset the start offset in the data * @param length the number of bytes that are drawn * @param x the x coordinate of the baseline of the text * @param y the y coordinate of the baseline of the text * @see java.awt.Graphics#drawChars * @see java.awt.Graphics#drawString */ public void drawBytes(byte[] data, int offset, int length, int x, int y) { } /** * 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. * @param img the specified image to be drawn. * @param x the x coordinate. * @param y the y coordinate. * @param observer object to be notified as more of * the image is converted. * @return true if the image is completely loaded; * false otherwise. * @see java.awt.Image * @see java.awt.image.ImageObserver * @see java.awt.image.ImageObserver#imageUpdate(java.awt.Image, int, int, int, int, int) */ public abstract boolean drawImage(Image img, int x, int y, 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. * @param img the specified image to be drawn. * @param x the x coordinate. * @param y the y coordinate. * @param width the width of the rectangle. * @param height the height of the rectangle. * @param observer object to be notified as more of * the image is converted. * @return true if the current output representation * is complete; false otherwise. * @see java.awt.Image * @see java.awt.image.ImageObserver * @see java.awt.image.ImageObserver#imageUpdate(java.awt.Image, int, int, int, int, int) */ public abstract boolean drawImage(Image img, int x, int y, int width, int height, 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. * @param img the specified image to be drawn. * @param x the x coordinate. * @param y the y coordinate. * @param bgcolor the background color to paint under the * non-opaque portions of the image. * @param observer object to be notified as more of * the image is converted. * @return true if the image is completely loaded; * false otherwise. * @see java.awt.Image * @see java.awt.image.ImageObserver * @see java.awt.image.ImageObserver#imageUpdate(java.awt.Image, int, int, int, int, int) */ public abstract boolean drawImage(Image img, int x, int y, 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. * @param img the specified image to be drawn. * @param x the x coordinate. * @param y the y coordinate. * @param width the width of the rectangle. * @param height the height of the rectangle. * @param bgcolor the background color to paint under the * non-opaque portions of the image. * @param observer object to be notified as more of * the image is converted. * @return true if the current output representation * is complete; false otherwise. * @see java.awt.Image * @see java.awt.image.ImageObserver * @see java.awt.image.ImageObserver#imageUpdate(java.awt.Image, int, int, int, int, int) */ public abstract boolean drawImage(Image img, int x, int y, int width, int height, 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 * 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. * @param img the specified image to be drawn * @param dx1 the x coordinate of the first corner of the * destination rectangle. * @param dy1 the y coordinate of the first corner of the * destination rectangle. * @param dx2 the x coordinate of the second corner of the * destination rectangle. * @param dy2 the y coordinate of the second corner of the * destination rectangle. * @param sx1 the x coordinate of the first corner of the * source rectangle. * @param sy1 the y coordinate of the first corner of the * source rectangle. * @param sx2 the x coordinate of the second corner of the * source rectangle. * @param sy2 the y coordinate of the second corner of the * source rectangle. * @param observer object to be notified as more of the image is * scaled and converted. * @return true if the current output representation * is complete; false otherwise. * @see java.awt.Image * @see java.awt.image.ImageObserver * @see java.awt.image.ImageObserver#imageUpdate(java.awt.Image, int, int, int, int, int) * @since JDK1.1 */ 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 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. * @param img the specified image to be drawn * @param dx1 the x coordinate of the first corner of the * destination rectangle. * @param dy1 the y coordinate of the first corner of the * destination rectangle. * @param dx2 the x coordinate of the second corner of the * destination rectangle. * @param dy2 the y coordinate of the second corner of the * destination rectangle. * @param sx1 the x coordinate of the first corner of the * source rectangle. * @param sy1 the y coordinate of the first corner of the * source rectangle. * @param sx2 the x coordinate of the second corner of the * source rectangle. * @param sy2 the y coordinate of the second corner of the * source rectangle. * @param bgcolor the background color to paint under the * non-opaque portions of the image. * @param observer object to be notified as more of the image is * scaled and converted. * @return true if the current output representation * is complete; false otherwise. * @see java.awt.Image * @see java.awt.image.ImageObserver * @see java.awt.image.ImageObserver#imageUpdate(java.awt.Image, int, int, int, int, int) * @since JDK1.1 */ 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); /** * Disposes of this graphics context and releases * any system resources that it is using. * A Graphics object cannot be used after * disposehas 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. *