lt.monarch.image
Class ImageWriter

java.lang.Object
  lt.monarch.image.ImageWriter

public class ImageWriter
extends java.lang.Object

This utility class writes chart view as encoded image to given data streams.

Field Summary

Modifier and Type	Field and Description
static int	SCREEN_DPI Number of pixels per inch on monitor screen.

Constructor and Description

ImageWriter()

Method Summary

Modifier and Type	Method and Description
void	draw(AbstractGraphics g, View chart, int width, int height) Instead of writing encoded image data to stream, this lower level method allows to draw chart view into any graphics context for further custom manipulation.
void	writePNG(java.io.OutputStream stream, View chart, int width, int height) Outputs chart image encoded in PNG format with dpi equal to SCREEN_DPI.
void	writePNG(java.io.OutputStream stream, View chart, int width, int height, int dpi) Outputs chart image encoded in PNG format using given dpi.
void	writeSVG(java.io.OutputStream stream, View chart, int width, int height) Outputs chart image encoded in SVG format.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

SCREEN_DPI

public static final int SCREEN_DPI

Number of pixels per inch on monitor screen. This constant is used to calculate necessary scaling when generating images with different DPIs. Equals to 72.

See Also:

Constant Field Values

Constructor Detail

ImageWriter

public ImageWriter()

Method Detail

writePNG

public void writePNG(java.io.OutputStream stream,
                     View chart,
                     int width,
                     int height)

Outputs chart image encoded in PNG format with dpi equal to SCREEN_DPI.

Parameters:

stream - stream to write into. Stream is closed on return.

chart - chart view

width - width of chart

height - height of chart

writePNG

public void writePNG(java.io.OutputStream stream,
                     View chart,
                     int width,
                     int height,
                     int dpi)

Outputs chart image encoded in PNG format using given dpi. Chart will look like on-screen-rendered width x height sized view, but image will be bigger in pixels. dpi/SCREEN_DPI ratio will be used for scaling.

Parameters:

stream - stream to write into. Stream is closed on return.

chart - chart view

width - width of chart

height - height of chart

dpi - dots per inch for exported image

writeSVG

public void writeSVG(java.io.OutputStream stream,
                     View chart,
                     int width,
                     int height)

Outputs chart image encoded in SVG format.

Parameters:

stream - stream to write into. Stream is closed on return.

chart - chart view

width - width of chart

height - height of chart

draw

public void draw(AbstractGraphics g,
                 View chart,
                 int width,
                 int height)

Instead of writing encoded image data to stream, this lower level method allows to draw chart view into any graphics context for further custom manipulation.

Parameters:

g - graphics context

chart - chart view

width - width of chart

height - height of chart