ImageWorker (Javadocs [I2P+ 2.13.0+]

java.lang.Object
- org.rrd4j.graph.ImageWorker

Direct Known Subclasses:
BufferedImageWorker, SVGImageWorker
```
public abstract class ImageWorker
extends Object
```
Abstract base class for image workers in RRD graphs. Provides drawing operations for creating graph images with various output formats. Tracks last paint/stroke/font to avoid redundant state changes that produce duplicate inline styles in SVG output. Default constructor.

Constructor Summary
Constructors
Constructor and Description
ImageWorker()

Constructors
Constructor and Description
`ImageWorker()`

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method and Description
`(package private) void`	`clip(int x, int y, int width, int height)` Set the clipping region for drawing operations.
`(package private) void`	`dispose()` Dispose of the graphics context.
`(package private) void`	`drawLine(int x1, int y1, int x2, int y2, Paint paint, Stroke stroke)` Draw a line with the given paint and stroke.
`(package private) void`	`drawPolyline(double[] x, double[] y, Paint paint, Stroke stroke)` Draw a polyline with the given paint and stroke.
`(package private) void`	`drawString(String text, int x, int y, Font font, Paint paint)` Draw a string at the given position with the specified font and paint.
`(package private) void`	`fillPolygon(double[] x, double[] yBottom, double[] yTop, Paint paint)` Fill a polygon with variable bottom points.
`(package private) void`	`fillPolygon(double[] x, double yBottom, double[] yTop, Paint paint)` Fill a polygon with a flat bottom.
`(package private) void`	`fillRect(int x, int y, int width, int height, Paint paint)` Fill a rectangle with the given paint.
`(package private) double`	`getFontAscent(Font font)` Get the ascent of the given font.
`(package private) double`	`getFontHeight(Font font)` Get the total height of the given font.
`(package private) byte[]`	`getImageBytes()` Get the image as a byte array.
`(package private) double`	`getStringWidth(String text, Font font)` Get the width of the given text in the specified font.
`(package private) void`	`loadImage(RrdGraphDef.ImageSource imageSource, int x, int y, int w, int h)` Load and draw an image from the given source.
`(package private) abstract void`	`makeImage(OutputStream os)` Write the image to the given output stream.
`(package private) void`	`makeImage(Path path)` Write the image to the given path.
`(package private) void`	`reset()` Reset the graphics state.
`protected abstract void`	`reset(Graphics2D g2d)` Reset the graphics state using the given context.
`protected void`	`resetState()` Resets cached state tracking.
`(package private) abstract void`	`resize(int width, int height)` Resize the image to the given dimensions.
`(package private) void`	`saveImage(String path)` Save the image to the given file path.
`(package private) void`	`setAntiAliasing(boolean enable)` Enable or disable anti-aliasing.
`protected void`	`setG2d(Graphics2D g2d)` Sets the graphics context for drawing operations.
`(package private) void`	`setTextAntiAliasing(boolean enable)` Enable or disable text anti-aliasing.
`(package private) void`	`transform(int x, int y, double angle)` Apply a translation and rotation transform.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - ImageWorker
```
public ImageWorker()
```
- Method Detail
  - clip
```
void clip(int x,
          int y,
          int width,
          int height)
```
    Set the clipping region for drawing operations.
    Parameters:
    x - the x coordinate
    y - the y coordinate
    width - the width
    height - the height
  - dispose
```
void dispose()
```
    Dispose of the graphics context.
  - drawLine
```
void drawLine(int x1,
              int y1,
              int x2,
              int y2,
              Paint paint,
              Stroke stroke)
```
    Draw a line with the given paint and stroke.
    Parameters:
    x1 - the starting x coordinate
    y1 - the starting y coordinate
    x2 - the ending x coordinate
    y2 - the ending y coordinate
    paint - the paint
    stroke - the stroke
  - drawPolyline
```
void drawPolyline(double[] x,
                  double[] y,
                  Paint paint,
                  Stroke stroke)
```
    Draw a polyline with the given paint and stroke.
    Parameters:
    x - the x coordinates
    y - the y coordinates
    paint - the paint
    stroke - the stroke
  - drawString
```
void drawString(String text,
                int x,
                int y,
                Font font,
                Paint paint)
```
    Draw a string at the given position with the specified font and paint.
    Parameters:
    text - the text to draw
    x - the x coordinate
    y - the y coordinate
    font - the font
    paint - the paint
  - fillPolygon
```
void fillPolygon(double[] x,
                 double[] yBottom,
                 double[] yTop,
                 Paint paint)
```
    Fill a polygon with variable bottom points.
    Parameters:
    x - the x coordinates
    yBottom - the bottom y coordinates
    yTop - the top y coordinates
    paint - the paint to fill with
  - fillPolygon
```
void fillPolygon(double[] x,
                 double yBottom,
                 double[] yTop,
                 Paint paint)
```
    Fill a polygon with a flat bottom.
    Parameters:
    x - the x coordinates
    yBottom - the bottom y coordinate
    yTop - the top y coordinates
    paint - the paint to fill with
  - fillRect
```
void fillRect(int x,
              int y,
              int width,
              int height,
              Paint paint)
```
    Fill a rectangle with the given paint.
    Parameters:
    x - the x coordinate
    y - the y coordinate
    width - the width
    height - the height
    paint - the paint to fill with
  - getFontAscent
```
double getFontAscent(Font font)
```
    Get the ascent of the given font.
    Parameters:
    font - the font
    Returns:
    the font ascent
  - getFontHeight
```
double getFontHeight(Font font)
```
    Get the total height of the given font.
    Parameters:
    font - the font
    Returns:
    the font height (ascent + descent)
  - getImageBytes
```
byte[] getImageBytes()
              throws IOException
```
    Get the image as a byte array.
    Returns:
    the image bytes
    Throws:
    IOException - if an I/O error occurs
  - getStringWidth
```
double getStringWidth(String text,
                      Font font)
```
    Get the width of the given text in the specified font.
    Parameters:
    text - the text
    font - the font
    Returns:
    the string width
  - loadImage
```
void loadImage(RrdGraphDef.ImageSource imageSource,
               int x,
               int y,
               int w,
               int h)
        throws IOException
```
    Load and draw an image from the given source.
    Parameters:
    imageSource - the image source
    x - the x coordinate
    y - the y coordinate
    w - the width
    h - the height
    Throws:
    IOException - if an I/O error occurs
  - makeImage
```
abstract void makeImage(OutputStream os)
                 throws IOException
```
    Write the image to the given output stream.
    Parameters:
    os - the output stream
    Throws:
    IOException - if an I/O error occurs
  - makeImage
```
void makeImage(Path path)
        throws IOException
```
    Write the image to the given path.
    Parameters:
    path - the output path
    Throws:
    IOException - if an I/O error occurs
  - reset
```
void reset()
```
    Reset the graphics state.
  - reset
```
protected abstract void reset(Graphics2D g2d)
```
    Reset the graphics state using the given context.
    Parameters:
    g2d - the graphics context
  - resetState
```
protected void resetState()
```
    Resets cached state tracking. Called when the graphics context changes or when an SVG group boundary is opened/closed that may affect inherited state.
  - resize
```
abstract void resize(int width,
                     int height)
```
    Resize the image to the given dimensions.
    Parameters:
    width - the new width
    height - the new height
  - saveImage
```
void saveImage(String path)
        throws IOException
```
    Save the image to the given file path.
    Parameters:
    path - the file path
    Throws:
    IOException - if an I/O error occurs
  - setAntiAliasing
```
void setAntiAliasing(boolean enable)
```
    Enable or disable anti-aliasing.
    Parameters:
    enable - true to enable, false to disable
  - setG2d
```
protected void setG2d(Graphics2D g2d)
```
    Sets the graphics context for drawing operations. Disposes of previous context if exists.
    Parameters:
    g2d - new graphics context
  - setTextAntiAliasing
```
void setTextAntiAliasing(boolean enable)
```
    Enable or disable text anti-aliasing.
    Parameters:
    enable - true to enable, false to disable
  - transform
```
void transform(int x,
               int y,
               double angle)
```
    Apply a translation and rotation transform.
    Parameters:
    x - the x translation
    y - the y translation
    angle - the rotation angle

Class ImageWorker

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

ImageWorker

Method Detail

clip

dispose

drawLine

drawPolyline

drawString

fillPolygon

fillPolygon

fillRect

getFontAscent

getFontHeight

getImageBytes

getStringWidth

loadImage

makeImage

makeImage

reset

reset

resetState

resize

saveImage

setAntiAliasing

setG2d

setTextAntiAliasing

transform