dev.roanh.convexmerger.animation

Class CalliperAnimation

java.lang.Object

dev.roanh.convexmerger.animation.Animation

dev.roanh.convexmerger.animation.CalliperAnimation

public class CalliperAnimation
extends Animation

Animation to visualise the callipers used when merging two convex objects.

Field Summary

Fields

Modifier and Type	Field and Description
private static float	DURATION The number of milliseconds the animation runs for.
private ConvexObject	first The first object in the merge.
private double	firstAngle The angle of the first merge line.
private java.awt.geom.Line2D	firstLine The first merge line.
private int	indexFirst Cached current index in the first object's points list.
private int	indexSecond Cached current index in the second object's points list.
private ConvexObject	second The second object in the merge.
private double	secondAngle The angle of the second merge line.
private java.awt.geom.Line2D	secondLine The second merge line.
private long	start The epoch millisecond start time of the animation.

Fields inherited from class dev.roanh.convexmerger.animation.Animation

EMPTY

Constructor Summary

Constructors

Constructor and Description
CalliperAnimation(ConvexObject first, ConvexObject second) Constructs a new calliper animation for the given objects.

Method Summary

Modifier and Type	Method and Description
private int	drawCalliper(java.awt.Graphics2D g, java.util.List<java.awt.geom.Point2D> points, double angle, int index) Draws the calliper line for the given object at the given angle.
private void	drawLine(java.awt.Graphics2D g, double x1, double y1, double x2, double y2) Draws an 'infinite' line segment through the two given points.
protected boolean	render(java.awt.Graphics2D g) Renders the next frame of this animation.

Methods inherited from class dev.roanh.convexmerger.animation.Animation

end, run, waitFor

Methods inherited from class java.lang.Object

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

Field Detail

DURATION

private static final float DURATION

The number of milliseconds the animation runs for.

See Also:

Constant Field Values

start

private long start

The epoch millisecond start time of the animation.

indexFirst

private int indexFirst

Cached current index in the first object's points list.

indexSecond

private int indexSecond

Cached current index in the second object's points list.

first

private ConvexObject first

The first object in the merge.

second

private ConvexObject second

The second object in the merge.

firstLine

private java.awt.geom.Line2D firstLine

The first merge line.

secondLine

private java.awt.geom.Line2D secondLine

The second merge line.

firstAngle

private double firstAngle

The angle of the first merge line.

secondAngle

private double secondAngle

The angle of the second merge line.

Constructor Detail

CalliperAnimation

public CalliperAnimation(ConvexObject first,
                         ConvexObject second)

Constructs a new calliper animation for the given objects. Note: this animation only renders the callipers and not the objects.

Parameters:

first - The first object from the merge.

second - The second object from the merge.

Method Detail

render

protected boolean render(java.awt.Graphics2D g)

Description copied from class: Animation

Renders the next frame of this animation.

Specified by:

render in class Animation

Parameters:

g - The graphics context to use.

Returns:

True if the animation has frames remaining, false if it finished.

drawCalliper

private int drawCalliper(java.awt.Graphics2D g,
                         java.util.List<java.awt.geom.Point2D> points,
                         double angle,
                         int index)

Draws the calliper line for the given object at the given angle.

Parameters:

g - The graphics context to use.

points - The points of the convex object to draw a calliper for.

angle - The angle of the calliper line to draw.

index - The object point set index left off at during the previous animation frame.

Returns:

The new object point set index left off at.

drawLine

private void drawLine(java.awt.Graphics2D g,
                      double x1,
                      double y1,
                      double x2,
                      double y2)

Draws an 'infinite' line segment through the two given points.

Parameters:

g - The graphics context to use.

x1 - The x-coordinate of the first point.

y1 - The y-coordinate of the first point.

x2 - The x-coordinate of the second point.

y2 - The y-coordinate of the second point.