Package net.codecrete.qrbill.canvas

Class PDFCanvas

java.lang.Object

net.codecrete.qrbill.canvas.AbstractCanvas

net.codecrete.qrbill.canvas.PDFCanvas

All Implemented Interfaces:

Closeable, AutoCloseable, ByteArrayResult, Canvas

public class PDFCanvas
extends AbstractCanvas
implements ByteArrayResult

Canvas for generating PDF files.

The PDF generator currently only supports the Helvetica font.

Nested Class Summary

Nested classes/interfaces inherited from interface net.codecrete.qrbill.canvas.Canvas

Canvas.LineStyle

Field Summary

Fields

Modifier and Type	Field	Description
static final int	LAST_PAGE	Add the QR bill on the last page of the PDF document.
static final int	NEW_PAGE_AT_END	Add the QR bill on a new page at the end of the PDF document.

Fields inherited from class net.codecrete.qrbill.canvas.AbstractCanvas

MM_TO_PT

Constructor Summary

Constructors

Constructor	Description
PDFCanvas(byte[] pdfDocument, int pageNo)	Creates a new instance for adding the QR bill to an exiting PDF document.
PDFCanvas(double width, double height)	Creates a new instance using the specified page size.
PDFCanvas(Path path, int pageNo)	Creates a new instance for adding the QR bill to an exiting PDF document.

Method Summary

Modifier and Type	Method	Description
void	addRectangle(double x, double y, double width, double height)	Adds a rectangle to the path
void	close()
void	closeSubpath()	Closes the current subpath
void	cubicCurveTo(double x1, double y1, double x2, double y2, double x, double y)	Adds a cubic Beziér curve to the open path going from the previous point to the specified position.
void	fillPath(int color, boolean smoothing)	Fills the current path and ends it
void	lineTo(double x, double y)	Adds a line segment to the open path from the previous point to the specified position.
void	moveTo(double x, double y)	Moves the current point of the open path to the specified position.
void	putText(String text, double x, double y, int fontSize, boolean isBold)	Adds text to the graphics.
void	putTextLines(String[] lines, double x, double y, int fontSize, double leading)	Adds several lines of text to the graphics.
void	saveAs(Path path)	Saves the resulting PDF document to the specified path.
void	setTransformation(double translateX, double translateY, double rotate, double scaleX, double scaleY)	Sets a translation, rotation and scaling for the subsequent operations
void	startPath()	Starts a path that can be filled or stroked
void	strokePath(double strokeWidth, int color, Canvas.LineStyle lineStyle, boolean smoothing)	Strokes the current path and ends it
byte[]	toByteArray()	Gets the resulting graphics as a byte array.
void	writeTo(OutputStream os)	Writes the resulting PDF document to the specified output stream.

Methods inherited from class net.codecrete.qrbill.canvas.AbstractCanvas

getAscender, getDescender, getLineHeight, getTextWidth, setupFontMetrics, splitLines

Methods inherited from class java.lang.Object

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

Field Details

LAST_PAGE

public static final int LAST_PAGE

Add the QR bill on the last page of the PDF document.

See Also:

• Constant Field Values

NEW_PAGE_AT_END

public static final int NEW_PAGE_AT_END

Add the QR bill on a new page at the end of the PDF document.

See Also:

• Constant Field Values

Constructor Details

PDFCanvas

public PDFCanvas(double width,
 double height)
          throws IOException

Creates a new instance using the specified page size.

Parameters:

width - page width, in mm

height - page height, in mm

Throws:

IOException - thrown if the creation fails

PDFCanvas

public PDFCanvas(Path path,
 int pageNo)
          throws IOException

Creates a new instance for adding the QR bill to an exiting PDF document.

The QR bill can either be added to an existing page by specifying the page number of an existing page (or LAST_PAGE), or it can be added to a new page at the end of the document (see NEW_PAGE_AT_END).

The created instance assumes that the page for the QR bill has A4 format and will add the QR bill at the bottom of the page.

Parameters:

path - path to exiting document

pageNo - the zero-based number of the page the QR bill should be added to

Throws:

IOException - thrown if the creation fails

PDFCanvas

public PDFCanvas(byte[] pdfDocument,
 int pageNo)
          throws IOException

Creates a new instance for adding the QR bill to an exiting PDF document.

The QR bill can either be added to an existing page by specifying the page number of an existing page (or LAST_PAGE), or it can be added to a new page at the end of the document (see NEW_PAGE_AT_END).

The created instance assumes that the page for the QR bill has A4 format and will add the QR bill at the bottom of the page.

Parameters:

pdfDocument - binary array contianing PDF document

pageNo - the zero-based number of the page the QR bill should be added to

Throws:

IOException - thrown if the creation fails

Method Details

setTransformation

public void setTransformation(double translateX,
 double translateY,
 double rotate,
 double scaleX,
 double scaleY)
                       throws IOException

Description copied from interface: Canvas

Sets a translation, rotation and scaling for the subsequent operations

Before a new translation is applied, the coordinate system is reset to it's original state.

The transformations are applied in the order translation, rotation, scaling.

Specified by:

setTransformation in interface Canvas

Parameters:

translateX - translation in x direction (in mm)

translateY - translation in y direction (in mm)

rotate - rotation angle, in radians

scaleX - scale factor in x direction (1.0 = no scaling)

scaleY - scale factor in y direction (1.0 = no scaling)

Throws:

IOException - thrown if the graphics cannot be generated

putText

public void putText(String text,
 double x,
 double y,
 int fontSize,
 boolean isBold)
             throws IOException

Description copied from interface: Canvas

Adds text to the graphics.

The text position refers to the left most point on the text's baseline.

Specified by:

putText in interface Canvas

Parameters:

text - the text

x - x position of the text's start (in mm)

y - y position of the text's top (in mm)

fontSize - the font size (in pt)

isBold - indicates if the text is in bold or regular weight

Throws:

IOException - thrown if the graphics cannot be generated

putTextLines

public void putTextLines(String[] lines,
 double x,
 double y,
 int fontSize,
 double leading)
                  throws IOException

Description copied from interface: Canvas

Adds several lines of text to the graphics.

The text position refers to the left most point on the baseline of the first text line. Additional lines then follow below.

Specified by:

putTextLines in interface Canvas

Overrides:

putTextLines in class AbstractCanvas

Parameters:

lines - the text lines

x - x position of the text's start (in mm)

y - y position of the text's top (in mm)

fontSize - the font size (in pt)

leading - additional vertical space between text lines (in mm)

Throws:

IOException - thrown if the graphics cannot be generated

startPath

public void startPath()

Description copied from interface: Canvas

Starts a path that can be filled or stroked

Specified by:

startPath in interface Canvas

moveTo

public void moveTo(double x,
 double y)
            throws IOException

Description copied from interface: Canvas

Moves the current point of the open path to the specified position.

Specified by:

moveTo in interface Canvas

Parameters:

x - x-coordinate of position

y - y-coordinate of position

Throws:

IOException - thrown if the graphics cannot be generated

lineTo

public void lineTo(double x,
 double y)
            throws IOException

Description copied from interface: Canvas

Adds a line segment to the open path from the previous point to the specified position.

Specified by:

lineTo in interface Canvas

Parameters:

x - x-coordinate of position

y - y-coordinate of position

Throws:

IOException - thrown if the graphics cannot be generated

cubicCurveTo

public void cubicCurveTo(double x1,
 double y1,
 double x2,
 double y2,
 double x,
 double y)
                  throws IOException

Description copied from interface: Canvas

Adds a cubic Beziér curve to the open path going from the previous point to the specified position. Two control points control the curve

Specified by:

cubicCurveTo in interface Canvas

Parameters:

x1 - x-coordinate of first control point

y1 - y-coordinate of first control point

x2 - x-coordinate of second control point

y2 - y-coordinate of second control point

x - x-coordinate of position

y - y-coordinate of position

Throws:

IOException - thrown if the graphics cannot be generated

addRectangle

public void addRectangle(double x,
 double y,
 double width,
 double height)
                  throws IOException

Description copied from interface: Canvas

Adds a rectangle to the path

Specified by:

addRectangle in interface Canvas

Parameters:

x - the rectangle's left position (in mm)

y - the rectangle's top position (in mm)

width - the rectangle's width (in mm)

height - rectangle's height (in mm)

Throws:

IOException - thrown if the graphics cannot be generated

closeSubpath

public void closeSubpath()
                  throws IOException

Description copied from interface: Canvas

Closes the current subpath

Specified by:

closeSubpath in interface Canvas

Throws:

IOException - thrown if the graphics cannot be generated

fillPath

public void fillPath(int color,
 boolean smoothing)
              throws IOException

Description copied from interface: Canvas

Fills the current path and ends it

Specified by:

fillPath in interface Canvas

Parameters:

color - the fill color (expressed similar to HTML, e.g. 0xffffff for white)

smoothing - true for using smoothing techniques such as antialiasing, false otherwise

Throws:

IOException - thrown if the graphics cannot be generated

strokePath

public void strokePath(double strokeWidth,
 int color,
 Canvas.LineStyle lineStyle,
 boolean smoothing)
                throws IOException

Description copied from interface: Canvas

Strokes the current path and ends it

Specified by:

strokePath in interface Canvas

Parameters:

strokeWidth - the stroke width (in pt)

color - the stroke color (expressed similar to HTML, e.g. 0xffffff for white)

lineStyle - the line style

smoothing - true for using smoothing techniques such as antialiasing, false otherwise

Throws:

IOException - thrown if the graphics cannot be generated

toByteArray

public byte[] toByteArray()
                   throws IOException

Description copied from interface: ByteArrayResult

Gets the resulting graphics as a byte array.

Specified by:

toByteArray in interface ByteArrayResult

Returns:

the byte array

Throws:

IOException - thrown if the construction of the byte array fails

writeTo

public void writeTo(OutputStream os)
             throws IOException

Writes the resulting PDF document to the specified output stream.

Parameters:

os - the output stream

Throws:

IOException - thrown if the image cannot be written

saveAs

public void saveAs(Path path)
            throws IOException

Saves the resulting PDF document to the specified path.

Parameters:

path - the path to write to

Throws:

IOException - thrown if the image cannot be written

close

public void close()
           throws IOException

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Throws:

IOException