Package org.openscience.cdk.renderer.visitor

Class AbstractAWTDrawVisitor

java.lang.Object

org.openscience.cdk.renderer.visitor.AbstractAWTDrawVisitor

All Implemented Interfaces:

IRenderingVisitor, IDrawVisitor

Direct Known Subclasses:

AWTDrawVisitor

public abstract class AbstractAWTDrawVisitor
extends Object
implements IDrawVisitor

Partial implementation of the IDrawVisitor interface for the AWT widget toolkit, allowing molecules to be rendered with toolkits based on AWT, like the Java reference graphics platform Swing.

Source code:

main

Belongs to CDK module:

renderawt

Field Summary

Fields

Modifier and Type	Field	Description
protected AffineTransform	transform	This is initially null, and must be set in the setTransform method!

Constructor Summary

Constructors

Constructor	Description
AbstractAWTDrawVisitor()

Method Summary

Modifier and Type	Method	Description
protected Point	getTextBasePoint(String text, double xCoord, double yCoord, Graphics2D graphics)	Calculates the base point where text should be rendered, as text in Java is typically placed using the left-lower corner point in screen coordinates.
protected Rectangle2D	getTextBounds(String text, double xCoord, double yCoord, Graphics2D graphics)	Calculates the boundaries of a text string in screen coordinates.
protected Rectangle2D	getTextBounds(String text, Graphics2D g2)	Obtain the exact bounding box of the text in the provided graphics environment.
void	setTransform(AffineTransform transform)	Sets a new affine transformation to convert world coordinates into screen coordinates.
void	transformPoint(double[] xy)
int[]	transformPoint(double xCoord, double yCoord)	Transforms a point according to the current affine transformation, converting a world coordinate into a screen coordinate.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.openscience.cdk.renderer.visitor.IDrawVisitor

setFontManager, setRendererModel

Methods inherited from interface org.openscience.cdk.renderer.elements.IRenderingVisitor

visit

Field Detail

transform

protected AffineTransform transform

This is initially null, and must be set in the setTransform method!

Constructor Detail

AbstractAWTDrawVisitor

public AbstractAWTDrawVisitor()

Method Detail

transformPoint

public int[] transformPoint(double xCoord,
                            double yCoord)

Transforms a point according to the current affine transformation, converting a world coordinate into a screen coordinate.

Parameters:

xCoord - x-coordinate of the world point to transform

yCoord - y-coordinate of the world point to transform

Returns:

the transformed screen coordinate

transformPoint

public void transformPoint(double[] xy)

getTextBounds

protected Rectangle2D getTextBounds(String text,
                                    double xCoord,
                                    double yCoord,
                                    Graphics2D graphics)

Calculates the boundaries of a text string in screen coordinates.

Parameters:

text - the text string

xCoord - the world x-coordinate of where the text should be placed

yCoord - the world y-coordinate of where the text should be placed

graphics - the graphics to which the text is provided as output

Returns:

the screen coordinates

getTextBasePoint

protected Point getTextBasePoint(String text,
                                 double xCoord,
                                 double yCoord,
                                 Graphics2D graphics)

Calculates the base point where text should be rendered, as text in Java is typically placed using the left-lower corner point in screen coordinates. However, because the Java coordinate system is inverted in the y-axis with respect to scientific coordinate systems (Java has 0,0 in the top left corner, while in science we have 0,0 in the lower left corner), some special action is needed, involving the size of the text.

Parameters:

text - the text string

xCoord - the world x-coordinate of where the text should be placed

yCoord - the world y-coordinate of where the text should be placed

graphics - the graphics to which the text is provided as output

Returns:

the screen coordinates

getTextBounds

protected Rectangle2D getTextBounds(String text,
                                    Graphics2D g2)

Obtain the exact bounding box of the text in the provided graphics environment.

Parameters:

text - the text to obtain the bounds of

g2 - the graphic environment

Returns:

bounds of the text

See Also:

TextLayout

setTransform

public void setTransform(AffineTransform transform)

Sets a new affine transformation to convert world coordinates into screen coordinates.

Specified by:

setTransform in interface IRenderingVisitor

Parameters:

transform - the new AffineTransform.