ilog.views.chart.util

Class IlvGraphicUtil

java.lang.Object

ilog.views.chart.util.IlvGraphicUtil

public final class IlvGraphicUtil
extends Object

Utility class for graphical operations.

Since:

JViews 5.0

Method Summary

Modifier and Type	Method and Description
static Rectangle2D	addToRect(Rectangle2D r, double x, double y) Adds a point to a rectangle.
static Rectangle2D	addToRect(Rectangle2D r1, Rectangle2D r2) Adds two rectangles.
static void	addToRect(Rectangle r, int x, int y) Adds a point to a rectangle.
static void	addToRect(Rectangle r1, Rectangle r2) Adds two rectangles.
static Rectangle	applyInsets(Rectangle r, Insets insets) Applies insets to the specified rectangle.
static int	compareInsets(Insets i1, Insets i2) Compares two Insets objects.
static IlvDoublePoint	computeTextLocation(IlvDoublePoint loc, double angle, int offset, double width, double height) Computes the location of a text according to a reference point and a direction angle.
static double	computeXSeg(double x1, double y1, double x2, double y2, double y) Computes the x-coordinate of a point on a segment, according to its y-coordinate.
static double	computeYSeg(double x1, double y1, double x2, double y2, double x) Computes the y-coordinate of a point on a segment, according to its x-coordinate.
static Polygon	createPolygon(double[] xp, double[] yp, int count) Creates a Polygon from the specified double coordinates.
static int	doubleToInts(int count, double[] xpoints, double[] ypoints, int[] xp, int[] yp, boolean filter) Converts the specified double coordinates into integer coordinates.
static FontRenderContext	getFRC(boolean antiAliased, boolean fractionalMetrics) Returns a FontRenderContext with the specified rendering hints.
static Rectangle2D	grow(Rectangle2D rect, double h, double v) Resizes the specified Rectangle2D both horizontally and vertically.
static boolean	isEmpty(Insets insets) Indicates whether the specified Insets object is empty.
static boolean	lineIntersectsCircle(Line2D line, double x, double y, double radius) Returns whether the specified line intersects the specified circle.
static Insets	mergeInsets(Insets result, Insets insets) Merge the specified insets.
static void	paintJLabel(Graphics g, JLabel label, Rectangle bounds) Paints the foreground content (text and icon) of a JLabel according to the given bounds.
static double	pointAngle(double x1, double y1, double x2, double y2) Returns the angle in radians formed by the specified points.
static double	pointAngleDeg(double x1, double y1, double x2, double y2) Returns the angle in degrees, formed by the specified points.
static boolean	rectangleIntersectsCircle(Rectangle2D rect, double x, double y, double radius) Returns whether the specified rectangle intersects the specified circle.
static boolean	startAntiAliasing(Graphics g) Activates anti-aliasing on the specified Graphics context.
static boolean	startTextAntiAliasing(Graphics g) Activates text anti-aliasing on the specified Graphics context.
static void	stopAntiAliasing(Graphics g) Deactivates anti-aliasing on the specified Graphics context.
static void	stopTextAntiAliasing(Graphics g) Deactivates text anti-aliasing on the specified Graphics context.
static int	toInt(double coord) Converts a double coordinate to an integer coordinate.
static Rectangle	toRectangle(Rectangle2D r2d, Rectangle r) Converts a Rectangle2D object into a Rectangle object.
static Rectangle2D	transform(Rectangle2D bounds, AffineTransform t) Applies an affine transformation to a bounding rectangle.

Methods inherited from class java.lang.Object

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

Method Detail

startAntiAliasing

public static boolean startAntiAliasing(Graphics g)

Activates anti-aliasing on the specified Graphics context. This method does not activate text anti-aliasing. In order to toggle text anti-aliasing, use the startTextAntiAliasing(java.awt.Graphics) and stopTextAntiAliasing(java.awt.Graphics) methods.

Parameters:

g - The considered Graphics.

Returns:

A boolean value indicating if anti-aliasing was already turned on.

stopAntiAliasing

public static void stopAntiAliasing(Graphics g)

Deactivates anti-aliasing on the specified Graphics context.

See Also:

startAntiAliasing(java.awt.Graphics)

startTextAntiAliasing

public static boolean startTextAntiAliasing(Graphics g)

Activates text anti-aliasing on the specified Graphics context. Text anti-aliasing can only be turned on when global anti-aliasing is enabled.

Parameters:

g - The considered Graphics.

Returns:

A boolean value indicating if the text anti-aliasing was already turned on.

See Also:

startAntiAliasing(java.awt.Graphics)

stopTextAntiAliasing

public static void stopTextAntiAliasing(Graphics g)

Deactivates text anti-aliasing on the specified Graphics context.

See Also:

startTextAntiAliasing(java.awt.Graphics)

applyInsets

public static Rectangle applyInsets(Rectangle r,
                                    Insets insets)

Applies insets to the specified rectangle. This method stores the result in r and returns r.

compareInsets

public static int compareInsets(Insets i1,
                                Insets i2)

Compares two Insets objects.

Returns:

-1 if all the insets of i1 are less than the insets of i2, 0 if all the insets are equal, and 1 otherwise.

isEmpty

public static boolean isEmpty(Insets insets)

Indicates whether the specified Insets object is empty.

Returns:

true if all the insets of insets are equal to 0, and false otherwise.

mergeInsets

public static Insets mergeInsets(Insets result,
                                 Insets insets)

Merge the specified insets. This method computes the result by taking the largest insets.

Parameters:

result - The first insets, which is also used to store the result.

insets - The second insets.

Returns:

result.

pointAngle

public static double pointAngle(double x1,
                                double y1,
                                double x2,
                                double y2)

Returns the angle in radians formed by the specified points.

pointAngleDeg

public static double pointAngleDeg(double x1,
                                   double y1,
                                   double x2,
                                   double y2)

Returns the angle in degrees, formed by the specified points.

addToRect

public static void addToRect(Rectangle r,
                             int x,
                             int y)

Adds a point to a rectangle. If the specified rectangle is empty, the resulting rectangle has a width and height equal to 1, and a top-left corner located at the specified coordinates.

addToRect

public static void addToRect(Rectangle r1,
                             Rectangle r2)

Adds two rectangles. This method computes the union of r1 and r2 and returns the result into r1. The behavior of this method differs from the corresponding add method of java.awt.Rectangle when one of the rectangle is empty: in that case, the result is equal to the non-empty rectangle.

addToRect

public static Rectangle2D addToRect(Rectangle2D r,
                                    double x,
                                    double y)

Adds a point to a rectangle. If the specified rectangle is empty, the resulting rectangle has a width and height equal to 1, and a top-left corner located at the specified coordinates.

Parameters:

r - The considered rectangle. This rectangle is modified and returned by the method.

x - The x-coordinate of the point to add.

y - The x-coordinate of the point to add.

Returns:

The modified rectangle.

addToRect

public static Rectangle2D addToRect(Rectangle2D r1,
                                    Rectangle2D r2)

Adds two rectangles. This method computes the union of r1 and r2 and returns the result into r1. The behavior of this method differs from the corresponding add method of java.awt.geom.Rectangle2D when one of the rectangle is empty: in that case, the result is equal to the non-empty rectangle.

Parameters:

r1 - The first rectangle. This rectangle is modified and returned by the method.

r2 - The second rectangle.

Returns:

The modified rectangle.

toRectangle

public static Rectangle toRectangle(Rectangle2D r2d,
                                    Rectangle r)

Converts a Rectangle2D object into a Rectangle object.

Parameters:

r2d - The Rectangle2D object to convert.

r - A Rectangle object optionally used to store the result. If null, a new Rectangle is allocated.

Returns:

The converted rectangle.

grow

public static Rectangle2D grow(Rectangle2D rect,
                               double h,
                               double v)

Resizes the specified Rectangle2D both horizontally and vertically.

This method modifies rect so that it is h units larger on both the left and right side, and v units larger both at the top and bottom side.

The new Rectangle2D has (r.getX() - w, r.getY() - h) as its top-left corner, a width of r.getWidth() + 2*w, and a height of r.getHeight() + 2*h.

If negative values are supplied for h and v, the size of the Rectangle2D decreases accordingly.

Parameters:

rect - The rectangle to resize. This rectangle is modified by the method.

h - The horizontal expansion.

v - The vertical expansion.

Returns:

The resized rectangle.

Since:

JViews 5.5

transform

public static Rectangle2D transform(Rectangle2D bounds,
                                    AffineTransform t)

Applies an affine transformation to a bounding rectangle.

Parameters:

bounds - The initial bounds. This rectangle is modified by this method.

t - The considered transformation.

Returns:

The transformed bounds, computed such that it contains all the transformed points of the original rectangle.

Since:

JViews 5.5

computeYSeg

public static double computeYSeg(double x1,
                                 double y1,
                                 double x2,
                                 double y2,
                                 double x)

Computes the y-coordinate of a point on a segment, according to its x-coordinate.

computeXSeg

public static double computeXSeg(double x1,
                                 double y1,
                                 double x2,
                                 double y2,
                                 double y)

Computes the x-coordinate of a point on a segment, according to its y-coordinate.

Since:

JViews 5.5

lineIntersectsCircle

public static boolean lineIntersectsCircle(Line2D line,
                                           double x,
                                           double y,
                                           double radius)

Returns whether the specified line intersects the specified circle.

Parameters:

line - A line segment.

x - The x-coordinate of the center of the circle to test.

y - The y-coordinate of the center of the circle to test.

radius - The radius of the circle to test, should be > 0.

Since:

JViews 8.5

See Also:

IlvShapeUtil.distanceTo(Line2D, double, double, Point2D)

rectangleIntersectsCircle

public static boolean rectangleIntersectsCircle(Rectangle2D rect,
                                                double x,
                                                double y,
                                                double radius)

Returns whether the specified rectangle intersects the specified circle.

Parameters:

rect - A rectangle.

x - The x-coordinate of the center of the circle to test.

y - The y-coordinate of the center of the circle to test.

radius - The radius of the circle to test.

Since:

JViews 8.5

See Also:

IlvShapeUtil.distanceTo(Rectangle2D, double, double, Point2D)

toInt

public static int toInt(double coord)

Converts a double coordinate to an integer coordinate.

doubleToInts

public static int doubleToInts(int count,
                               double[] xpoints,
                               double[] ypoints,
                               int[] xp,
                               int[] yp,
                               boolean filter)

Converts the specified double coordinates into integer coordinates.

Parameters:

count - The number of coordinates to convert.

xpoints - The x-double coordinates.

ypoints - The y-double coordinates.

xp - The returned x-integer coordinates. The array size must be at least equal to count.

yp - The returned y-integer coordinates. The array size must be at least equal to count.

filter - A boolean value indicating whether the method should prune consecutive coordinates when they are equal.

Returns:

The number of integer coordinates stored in the returned arrays. This number can be less than count if the filter parameter is set to true.

createPolygon

public static Polygon createPolygon(double[] xp,
                                    double[] yp,
                                    int count)

Creates a Polygon from the specified double coordinates.

Parameters:

xp - The x-double coordinates.

yp - The y-double coordinates.

count - The number of coordinates.

Returns:

The created polygon.

computeTextLocation

public static IlvDoublePoint computeTextLocation(IlvDoublePoint loc,
                                                 double angle,
                                                 int offset,
                                                 double width,
                                                 double height)

Computes the location of a text according to a reference point and a direction angle.

Parameters:

loc - The reference point. This parameter is modified and returned by the method.

angle - The angle in degrees between the center of the text and the reference point.

offset - The desired distance between the point and the text boundaries.

width - The width of the text.

height - The height of the text.

Returns:

The center of the text.

Since:

JViews 5.5

getFRC

public static FontRenderContext getFRC(boolean antiAliased,
                                       boolean fractionalMetrics)

Returns a FontRenderContext with the specified rendering hints.

Parameters:

antiAliased - Specifies whether anti-aliased is used.

fractionalMetrics - Specifies whether fractional metrics are used.

Since:

JViews 5.5

paintJLabel

public static void paintJLabel(Graphics g,
                               JLabel label,
                               Rectangle bounds)

Paints the foreground content (text and icon) of a JLabel according to the given bounds. Assumes that the background (if any) of the JLabel has already been painted and that the needed font and anti-aliasing settings have been set on the Graphics context. Can be called in any thread.