generator random number between <code>min</code> and <code>max</code>. including <code>min</code> but not <code>max</code> @param min @param max @ret

Write 16-bit value to output stream, LSB first

generate the random validation strings @return

pick color from a random range @return Color random color

get random validation code string as lower case @return validation code

Adds next GIF frame. The frame is not written immediately, but is actually deferred until the next frame is received so that timing data can be insert

Flushes any pending data and closes output file. If writing to an OutputStream, the stream is not closed.

Sets the delay time between each frame, or changes it for subsequent frames (applies to last frame added). @param ms int delay time in mil

Sets quality of color quantization (conversion of images to the maximum 256 colors allowed by the GIF specification). Lower values (minimum = 1) produ

Sets the number of times the set of GIF frames should be played. Default is 1; 0 means play indefinitely. Must be invoked before the first image is ad

Initiates GIF file creation on the given stream. The stream is not closed automatically. @param os OutputStream on which GIF images are wr

Calculate alpha @param i @param j @return

Writes color table

Writes string to output stream

Analyzes image colors and creates color map.

Returns index of palette color closest to c

Calculate alpha @param i @param j @return

Calculate alpha @param i @param j @return

Extracts image pixels into byte array "pixels"

draw one frame for the GIF image @param fontcolor font color @param strs validation string @param flag @return

draw one frame for the GIF image @param fontcolor font color @param strs validation string @param flag @return

draw random validation code image @param strs the random validation code @return BufferedImage with validation code

draw one frame for the GIF image @param fontcolor font color @param strs validation string @param flag @return

Sets the GIF frame size. The default size is the size of the first frame added if this method is not invoked. @param w int frame width. @p

Writes Graphic Control Extension

Writes Image Descriptor

Writes Logical Screen Descriptor

Writes Netscape application extension to define repeat count.

Encodes and writes pixel data

no result provide for gif validation code. only for PNG validation code image. only @see com.github.botaruibo.xvcode.generator.Captcha#write2out(Outp

run on console to generate the images.use: <code>java -jar xvcode.jar -p "/test" -h 50 -w 120 -cl 5</code> @param args @throws FileNotFoundException @

Sets the GIF frame disposal code for the last added frame and any subsequent frames. Default is 0 if no transparent color has been set, otherwise 2.

Sets frame rate in frames per second. Equivalent to <code>setDelay(1000/fps)</code>. @param fps float frame rate (frames per second)

Sets the transparent color for the last added frame and any subsequent frames. Since all colors are subject to modification in the quantization proces

@param os source OutputStream @return OutputStream return OutputStream wrote the validation code image