org.rrd4j.graph

Class ImageWorker

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.

Constructor Summary

Constructors

Constructor and Description
ImageWorker()

Method Summary

Modifier and Type	Method and Description
(package private) void	clip(int x, int y, int width, int height)
(package private) void	dispose()
(package private) void	drawLine(int x1, int y1, int x2, int y2, Paint paint, Stroke stroke)
(package private) void	drawPolyline(double[] x, double[] y, Paint paint, Stroke stroke)
(package private) void	drawString(String text, int x, int y, Font font, Paint paint)
(package private) void	fillPolygon(double[] x, double[] yBottom, double[] yTop, Paint paint)
(package private) void	fillPolygon(double[] x, double yBottom, double[] yTop, Paint paint)
(package private) void	fillRect(int x, int y, int width, int height, Paint paint)
(package private) double	getFontAscent(Font font)
(package private) double	getFontHeight(Font font)
(package private) byte[]	getImageBytes()
(package private) double	getStringWidth(String text, Font font)
(package private) void	loadImage(RrdGraphDef.ImageSource imageSource, int x, int y, int w, int h)
(package private) abstract void	makeImage(OutputStream os)
(package private) void	makeImage(Path path)
(package private) void	reset()
protected abstract void	reset(Graphics2D g2d)
(package private) abstract void	resize(int width, int height)
(package private) void	saveImage(String path)
(package private) void	setAntiAliasing(boolean enable)
protected void	setG2d(Graphics2D g2d) Sets the graphics context for drawing operations.
(package private) void	setTextAntiAliasing(boolean enable)
(package private) void	transform(int x, int y, double angle)

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)

dispose

void dispose()

drawLine

void drawLine(int x1,
              int y1,
              int x2,
              int y2,
              Paint paint,
              Stroke stroke)

drawPolyline

void drawPolyline(double[] x,
                  double[] y,
                  Paint paint,
                  Stroke stroke)

drawString

void drawString(String text,
                int x,
                int y,
                Font font,
                Paint paint)

fillPolygon

void fillPolygon(double[] x,
                 double[] yBottom,
                 double[] yTop,
                 Paint paint)

fillPolygon

void fillPolygon(double[] x,
                 double yBottom,
                 double[] yTop,
                 Paint paint)

fillRect

void fillRect(int x,
              int y,
              int width,
              int height,
              Paint paint)

getFontAscent

double getFontAscent(Font font)

getFontHeight

double getFontHeight(Font font)

getImageBytes

byte[] getImageBytes()
              throws IOException

Throws:

IOException

getStringWidth

double getStringWidth(String text,
                      Font font)

loadImage

void loadImage(RrdGraphDef.ImageSource imageSource,
               int x,
               int y,
               int w,
               int h)
        throws IOException

Throws:

IOException

makeImage

abstract void makeImage(OutputStream os)
                 throws IOException

Throws:

IOException

makeImage

void makeImage(Path path)
        throws IOException

Throws:

IOException

reset

void reset()

reset

protected abstract void reset(Graphics2D g2d)

resize

abstract void resize(int width,
                     int height)

saveImage

void saveImage(String path)
        throws IOException

Throws:

IOException

setAntiAliasing

void setAntiAliasing(boolean enable)

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)

transform

void transform(int x,
               int y,
               double angle)