The Java(tm) FAQ -- Drawing

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Outline

Drawing AWT Components

Q8.1
What is the paint method for, when is it invoked, and by whom?

PaintExample.html

See also: Q5.1, Q8.2, Q8.3, Q8.5, Q8.6, Q9.17

Q8.2
What should I put in my paint method?

SlowPaintExample.html

See also: Q8.18

Q8.3
What is repaint for, when is it invoked, and by whom?

RepaintExample.html

See also: Q8.1, Q8.4

Q8.4
Why do my repeated calls to repaint not have any effect?

BusyRepaintExample.html

See also: Q9.5, Q9.13, Q9.15

Q8.5
What is update for, when is it invoked, and by whom?

UpdateExample.html

See also: Q8.1, Q8.2, Q8.3, Q8.5, Q8.18

Q8.6
What drawing occurs if my applet or other component reappears after being covered by some other window?

See also: Q8.1, Q8.3, Q8.4, Q8.5

Q8.7
Can I implement an invisible or partly transparent component?

See also: Q4.13, Q5.9

Q8.8
How does the XOR drawing mode work?

XORDrawingExample.html

Loading and Drawing Images

Q8.9
How do I load an image from the net into my applet?

See also: Q4.12, Q8.15

Q8.10
How do I load an image from a file in a stand-alone Java application, rather than in an applet?

AppGetImageExample.html

See also: Q4.12

Q8.11
When is an image actually loaded -- why not immediately?

See also: Q8.12

Q8.12
How can I make sure that my images are completely loaded before I check for their data or parameters?

TrackImageExample.html, TrackErrorImageExample.html

See also: Q8.10, Q8.11, Q8.13

Q8.13
Why does my call to Graphics's drawImage method fail to show the image?

FailedDrawImageExample.html, TrackErrorImageExample.html

See also: Q1.20, Q8.12

Q8.14
Can I force Applet's getImage method to make a new connection for each image rather than reusing a cached version of the image?

FlushImageExample.html

See also: Q8.15

Q8.15
How do I draw text over a background image?

TextOnImageExample.html

See also: Q8.14, Q8.16

Q8.16
How do I load and display a transparent GIF image over a background image?

TransparentImageExample.html

See also: Q8.15

Q8.17
How can I create an image from a buffer of raw image data (red, green, and blue values for each pixel)?

MemoryImageExample.html

See also: Q8.22

Q8.18
What is double buffering -- how can I create and draw to an offscreen image?

OffscreenImageExample.html

See also: Q8.5

Q8.19
How can I get at the raw data of an image, such as the pixel value at a given coordinate?

GrabPixelsExample.html

See also: Q2.23, Q8.17, Q9.16

Images -- JDK 1.0.2

Q8.20
Using the JDK 1.0.2, can I clear or reset a clipping rectangle that either I or the system has created?

SubgraphicsExample.html

See also: Q8.23

Q8.21
Using the JDK 1.0.2, can I copy a subarea of one image into another image?

CopyImageSubareaExample.html

See also: Q8.20, Q8.24

Images -- JDK 1.1

Q8.22
How do I control animation with MemoryImageSource?

See also: Q8.14, Q8.17

Q8.23
Using the JDK 1.1, how do I reset a clipping rectangle?

ResetClip11Example.html

See also: Q8.20

Q8.24
What's the best way in JDK 1.1 to draw just a subarea of an image?

See also: Q8.21