JDK8/Java8源码在线阅读
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/*
* @author Charlton Innovations, Inc.
*/
package java.awt.font;
import java.awt.Graphics2D;
import java.awt.Font;
import java.awt.Polygon; // remind - need a floating point version
import java.awt.Rectangle;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import java.awt.geom.AffineTransform;
import java.awt.Shape;
import java.awt.font.GlyphMetrics;
import java.awt.font.GlyphJustificationInfo;
/**
* A <code>GlyphVector</code> object is a collection of glyphs
* containing geometric information for the placement of each glyph
* in a transformed coordinate space which corresponds to the
* device on which the <code>GlyphVector</code> is ultimately
* displayed.
* <p>
* The <code>GlyphVector</code> does not attempt any interpretation of
* the sequence of glyphs it contains. Relationships between adjacent
* glyphs in sequence are solely used to determine the placement of
* the glyphs in the visual coordinate space.
* <p>
* Instances of <code>GlyphVector</code> are created by a {@link Font}.
* <p>
* In a text processing application that can cache intermediate
* representations of text, creation and subsequent caching of a
* <code>GlyphVector</code> for use during rendering is the fastest
* method to present the visual representation of characters to a user.
* <p>
* A <code>GlyphVector</code> is associated with exactly one
* <code>Font</code>, and can provide data useful only in relation to
* this <code>Font</code>. In addition, metrics obtained from a
* <code>GlyphVector</code> are not generally geometrically scaleable
* since the pixelization and spacing are dependent on grid-fitting
* algorithms within a <code>Font</code>. To facilitate accurate
* measurement of a <code>GlyphVector</code> and its component
* glyphs, you must specify a scaling transform, anti-alias mode, and
* fractional metrics mode when creating the <code>GlyphVector</code>.
* These characteristics can be derived from the destination device.
* <p>
* For each glyph in the <code>GlyphVector</code>, you can obtain:
* <ul>
* <li>the position of the glyph
* <li>the transform associated with the glyph
* <li>the metrics of the glyph in the context of the
* <code>GlyphVector</code>. The metrics of the glyph may be
* different under different transforms, application specified
* rendering hints, and the specific instance of the glyph within
* the <code>GlyphVector</code>.
* </ul>
* <p>
* Altering the data used to create the <code>GlyphVector</code> does not
* alter the state of the <code>GlyphVector</code>.
* <p>
* Methods are provided to adjust the positions of the glyphs
* within the <code>GlyphVector</code>. These methods are most
* appropriate for applications that are performing justification
* operations for the presentation of the glyphs.
* <p>
* Methods are provided to transform individual glyphs within the
* <code>GlyphVector</code>. These methods are primarily useful for
* special effects.
* <p>
* Methods are provided to return both the visual, logical, and pixel bounds
* of the entire <code>GlyphVector</code> or of individual glyphs within
* the <code>GlyphVector</code>.
* <p>
* Methods are provided to return a {@link Shape} for the
* <code>GlyphVector</code>, and for individual glyphs within the
* <code>GlyphVector</code>.
* @see Font
* @see GlyphMetrics
* @see TextLayout
* @author Charlton Innovations, Inc.
*/
public abstract class GlyphVector implements Cloneable {
//
// methods associated with creation-time state
//
/**
* Returns the <code>Font</code> associated with this
* <code>GlyphVector</code>.
* @return <code>Font</code> used to create this
* <code>GlyphVector</code>.
* @see Font
*/
public abstract Font getFont();
/**
* Returns the {@link FontRenderContext} associated with this
* <code>GlyphVector</code>.
* @return <code>FontRenderContext</code> used to create this
* <code>GlyphVector</code>.
* @see FontRenderContext
* @see Font
*/
public abstract FontRenderContext getFontRenderContext();
//
// methods associated with the GlyphVector as a whole
//
/**
* Assigns default positions to each glyph in this
* <code>GlyphVector</code>. This can destroy information
* generated during initial layout of this <code>GlyphVector</code>.
*/
public abstract void performDefaultLayout();
/**
* Returns the number of glyphs in this <code>GlyphVector</code>.
* @return number of glyphs in this <code>GlyphVector</code>.
*/
public abstract int getNumGlyphs();
/**
* Returns the glyphcode of the specified glyph.
* This return value is meaningless to anything other
* than the <code>Font</code> object that created this
* <code>GlyphVector</code>.
* @param glyphIndex the index into this <code>GlyphVector</code>
* that corresponds to the glyph from which to retrieve the
* glyphcode.
* @return the glyphcode of the glyph at the specified
* <code>glyphIndex</code>.
* @throws IndexOutOfBoundsException if <code>glyphIndex</code>
* is less than 0 or greater than or equal to the
* number of glyphs in this <code>GlyphVector</code>
*/
public abstract int getGlyphCode(int glyphIndex);
/**
* Returns an array of glyphcodes for the specified glyphs.
* The contents of this return value are meaningless to anything other
* than the <code>Font</code> used to create this
* <code>GlyphVector</code>. This method is used
* for convenience and performance when processing glyphcodes.
* If no array is passed in, a new array is created.
* @param beginGlyphIndex the index into this
* <code>GlyphVector</code> at which to start retrieving glyphcodes
* @param numEntries the number of glyphcodes to retrieve
* @param codeReturn the array that receives the glyphcodes and is
* then returned
* @return an array of glyphcodes for the specified glyphs.
* @throws IllegalArgumentException if <code>numEntries</code> is
* less than 0
* @throws IndexOutOfBoundsException if <code>beginGlyphIndex</code>
* is less than 0
* @throws IndexOutOfBoundsException if the sum of
* <code>beginGlyphIndex</code> and <code>numEntries</code> is
* greater than the number of glyphs in this
* <code>GlyphVector</code>
*/
public abstract int[] getGlyphCodes(int beginGlyphIndex, int numEntries,
int[] codeReturn);
/**
* Returns the character index of the specified glyph.
* The character index is the index of the first logical
* character represented by the glyph. The default
* implementation assumes a one-to-one, left-to-right mapping
* of glyphs to characters.
* @param glyphIndex the index of the glyph
* @return the index of the first character represented by the glyph
* @since 1.4
*/
public int getGlyphCharIndex(int glyphIndex) {
return glyphIndex;
}
/**
* Returns the character indices of the specified glyphs.
* The character index is the index of the first logical
* character represented by the glyph. Indices are returned
* in glyph order. The default implementation invokes
* getGlyphCharIndex for each glyph, and subclassers will probably
* want to override this implementation for performance reasons.
* Use this method for convenience and performance
* in processing of glyphcodes. If no array is passed in,
* a new array is created.
* @param beginGlyphIndex the index of the first glyph
* @param numEntries the number of glyph indices
* @param codeReturn the array into which to return the character indices
* @return an array of character indices, one per glyph.
* @since 1.4
*/
public int[] getGlyphCharIndices(int beginGlyphIndex, int numEntries,
int[] codeReturn) {
if (codeReturn == null) {
codeReturn = new int[numEntries];
}
for (int i = 0, j = beginGlyphIndex; i < numEntries; ++i, ++j) {
codeReturn[i] = getGlyphCharIndex(j);
}
return codeReturn;
}
/**
* Returns the logical bounds of this <code>GlyphVector</code>.
* This method is used when positioning this <code>GlyphVector</code>
* in relation to visually adjacent <code>GlyphVector</code> objects.
* @return a {@link Rectangle2D} that is the logical bounds of this
* <code>GlyphVector</code>.
*/
public abstract Rectangle2D getLogicalBounds();
/**
* Returns the visual bounds of this <code>GlyphVector</code>
* The visual bounds is the bounding box of the outline of this
* <code>GlyphVector</code>. Because of rasterization and
* alignment of pixels, it is possible that this box does not
* enclose all pixels affected by rendering this <code>GlyphVector</code>.
* @return a <code>Rectangle2D</code> that is the bounding box
* of this <code>GlyphVector</code>.
*/
public abstract Rectangle2D getVisualBounds();
/**
* Returns the pixel bounds of this <code>GlyphVector</code> when
* rendered in a graphics with the given
* <code>FontRenderContext</code> at the given location. The
* renderFRC need not be the same as the
* <code>FontRenderContext</code> of this
* <code>GlyphVector</code>, and can be null. If it is null, the
* <code>FontRenderContext</code> of this <code>GlyphVector</code>
* is used. The default implementation returns the visual bounds,
* offset to x, y and rounded out to the next integer value (i.e. returns an
* integer rectangle which encloses the visual bounds) and
* ignores the FRC. Subclassers should override this method.
* @param renderFRC the <code>FontRenderContext</code> of the <code>Graphics</code>.
* @param x the x-coordinate at which to render this <code>GlyphVector</code>.
* @param y the y-coordinate at which to render this <code>GlyphVector</code>.
* @return a <code>Rectangle</code> bounding the pixels that would be affected.
* @since 1.4
*/
public Rectangle getPixelBounds(FontRenderContext renderFRC, float x, float y) {
Rectangle2D rect = getVisualBounds();
int l = (int)Math.floor(rect.getX() + x);
int t = (int)Math.floor(rect.getY() + y);
int r = (int)Math.ceil(rect.getMaxX() + x);
int b = (int)Math.ceil(rect.getMaxY() + y);
return new Rectangle(l, t, r - l, b - t);
}
/**
* Returns a <code>Shape</code> whose interior corresponds to the
* visual representation of this <code>GlyphVector</code>.
* @return a <code>Shape</code> that is the outline of this
* <code>GlyphVector</code>.
*/
public abstract Shape getOutline();
/**
* Returns a <code>Shape</code> whose interior corresponds to the
* visual representation of this <code>GlyphVector</code> when
* rendered at x, y.
* @param x the X coordinate of this <code>GlyphVector</code>.
* @param y the Y coordinate of this <code>GlyphVector</code>.
* @return a <code>Shape</code> that is the outline of this
* <code>GlyphVector</code> when rendered at the specified
* coordinates.
*/
public abstract Shape getOutline(float x, float y);
/**
* Returns a <code>Shape</code> whose interior corresponds to the
* visual representation of the specified glyph
* within this <code>GlyphVector</code>.
* The outline returned by this method is positioned around the
* origin of each individual glyph.
* @param glyphIndex the index into this <code>GlyphVector</code>
* @return a <code>Shape</code> that is the outline of the glyph
* at the specified <code>glyphIndex</code> of this
* <code>GlyphVector</code>.
* @throws IndexOutOfBoundsException if <code>glyphIndex</code>
* is less than 0 or greater than or equal to the number
* of glyphs in this <code>GlyphVector</code>
*/
public abstract Shape getGlyphOutline(int glyphIndex);
/**
* Returns a <code>Shape</code> whose interior corresponds to the
* visual representation of the specified glyph
* within this <code>GlyphVector</code>, offset to x, y.
* The outline returned by this method is positioned around the
* origin of each individual glyph.
* @param glyphIndex the index into this <code>GlyphVector</code>
* @param x the X coordinate of the location of this {@code GlyphVector}
* @param y the Y coordinate of the location of this {@code GlyphVector}
* @return a <code>Shape</code> that is the outline of the glyph
* at the specified <code>glyphIndex</code> of this
* <code>GlyphVector</code> when rendered at the specified
* coordinates.
* @throws IndexOutOfBoundsException if <code>glyphIndex</code>
* is less than 0 or greater than or equal to the number
* of glyphs in this <code>GlyphVector</code>
* @since 1.4
*/
public Shape getGlyphOutline(int glyphIndex, float x, float y) {
Shape s = getGlyphOutline(glyphIndex);
AffineTransform at = AffineTransform.getTranslateInstance(x,y);
return at.createTransformedShape(s);
}
/**
* Returns the position of the specified glyph relative to the
* origin of this <code>GlyphVector</code>.
* If <code>glyphIndex</code> equals the number of of glyphs in
* this <code>GlyphVector</code>, this method returns the position after
* the last glyph. This position is used to define the advance of
* the entire <code>GlyphVector</code>.
* @param glyphIndex the index into this <code>GlyphVector</code>
* @return a {@link Point2D} object that is the position of the glyph
* at the specified <code>glyphIndex</code>.
* @throws IndexOutOfBoundsException if <code>glyphIndex</code>
* is less than 0 or greater than the number of glyphs
* in this <code>GlyphVector</code>
* @see #setGlyphPosition
*/
public abstract Point2D getGlyphPosition(int glyphIndex);
/**
* Sets the position of the specified glyph within this
* <code>GlyphVector</code>.
* If <code>glyphIndex</code> equals the number of of glyphs in
* this <code>GlyphVector</code>, this method sets the position after
* the last glyph. This position is used to define the advance of
* the entire <code>GlyphVector</code>.
* @param glyphIndex the index into this <code>GlyphVector</code>
* @param newPos the <code>Point2D</code> at which to position the
* glyph at the specified <code>glyphIndex</code>
* @throws IndexOutOfBoundsException if <code>glyphIndex</code>
* is less than 0 or greater than the number of glyphs
* in this <code>GlyphVector</code>
* @see #getGlyphPosition
*/
public abstract void setGlyphPosition(int glyphIndex, Point2D newPos);
/**
* Returns the transform of the specified glyph within this
* <code>GlyphVector</code>. The transform is relative to the
* glyph position. If no special transform has been applied,
* <code>null</code> can be returned. A null return indicates
* an identity transform.
* @param glyphIndex the index into this <code>GlyphVector</code>
* @return an {@link AffineTransform} that is the transform of
* the glyph at the specified <code>glyphIndex</code>.
* @throws IndexOutOfBoundsException if <code>glyphIndex</code>
* is less than 0 or greater than or equal to the number
* of glyphs in this <code>GlyphVector</code>
* @see #setGlyphTransform
*/
public abstract AffineTransform getGlyphTransform(int glyphIndex);
/**
* Sets the transform of the specified glyph within this
* <code>GlyphVector</code>. The transform is relative to the glyph
* position. A <code>null</code> argument for <code>newTX</code>
* indicates that no special transform is applied for the specified
* glyph.
* This method can be used to rotate, mirror, translate and scale the
* glyph. Adding a transform can result in significant performance changes.
* @param glyphIndex the index into this <code>GlyphVector</code>
* @param newTX the new transform of the glyph at <code>glyphIndex</code>
* @throws IndexOutOfBoundsException if <code>glyphIndex</code>
* is less than 0 or greater than or equal to the number
* of glyphs in this <code>GlyphVector</code>
* @see #getGlyphTransform
*/
public abstract void setGlyphTransform(int glyphIndex, AffineTransform newTX);
/**
* Returns flags describing the global state of the GlyphVector.
* Flags not described below are reserved. The default
* implementation returns 0 (meaning false) for the position adjustments,
* transforms, rtl, and complex flags.
* Subclassers should override this method, and make sure
* it correctly describes the GlyphVector and corresponds
* to the results of related calls.
* @return an int containing the flags describing the state
* @see #FLAG_HAS_POSITION_ADJUSTMENTS
* @see #FLAG_HAS_TRANSFORMS
* @see #FLAG_RUN_RTL
* @see #FLAG_COMPLEX_GLYPHS
* @see #FLAG_MASK
* @since 1.4
*/
public int getLayoutFlags() {
return 0;
}
/**
* A flag used with getLayoutFlags that indicates that this <code>GlyphVector</code> has
* per-glyph transforms.
* @since 1.4
*/
public static final int FLAG_HAS_TRANSFORMS = 1;
/**
* A flag used with getLayoutFlags that indicates that this <code>GlyphVector</code> has
* position adjustments. When this is true, the glyph positions don't match the
* accumulated default advances of the glyphs (for example, if kerning has been done).
* @since 1.4
*/
public static final int FLAG_HAS_POSITION_ADJUSTMENTS = 2;
/**
* A flag used with getLayoutFlags that indicates that this <code>GlyphVector</code> has
* a right-to-left run direction. This refers to the glyph-to-char mapping and does
* not imply that the visual locations of the glyphs are necessarily in this order,
* although generally they will be.
* @since 1.4
*/
public static final int FLAG_RUN_RTL = 4;
/**
* A flag used with getLayoutFlags that indicates that this <code>GlyphVector</code> has
* a complex glyph-to-char mapping (one that does not map glyphs to chars one-to-one in
* strictly ascending or descending order matching the run direction).
* @since 1.4
*/
public static final int FLAG_COMPLEX_GLYPHS = 8;
/**
* A mask for supported flags from getLayoutFlags. Only bits covered by the mask
* should be tested.
* @since 1.4
*/
public static final int FLAG_MASK =
FLAG_HAS_TRANSFORMS |
FLAG_HAS_POSITION_ADJUSTMENTS |
FLAG_RUN_RTL |
FLAG_COMPLEX_GLYPHS;
/**
* Returns an array of glyph positions for the specified glyphs.
* This method is used for convenience and performance when
* processing glyph positions.
* If no array is passed in, a new array is created.
* Even numbered array entries beginning with position zero are the X
* coordinates of the glyph numbered <code>beginGlyphIndex + position/2</code>.
* Odd numbered array entries beginning with position one are the Y
* coordinates of the glyph numbered <code>beginGlyphIndex + (position-1)/2</code>.
* If <code>beginGlyphIndex</code> equals the number of of glyphs in
* this <code>GlyphVector</code>, this method gets the position after
* the last glyph and this position is used to define the advance of
* the entire <code>GlyphVector</code>.
* @param beginGlyphIndex the index at which to begin retrieving
* glyph positions
* @param numEntries the number of glyphs to retrieve
* @param positionReturn the array that receives the glyph positions
* and is then returned.
* @return an array of glyph positions specified by
* <code>beginGlyphIndex</code> and <code>numEntries</code>.
* @throws IllegalArgumentException if <code>numEntries</code> is
* less than 0
* @throws IndexOutOfBoundsException if <code>beginGlyphIndex</code>
* is less than 0
* @throws IndexOutOfBoundsException if the sum of
* <code>beginGlyphIndex</code> and <code>numEntries</code>
* is greater than the number of glyphs in this
* <code>GlyphVector</code> plus one
*/
public abstract float[] getGlyphPositions(int beginGlyphIndex, int numEntries,
float[] positionReturn);
/**
* Returns the logical bounds of the specified glyph within this
* <code>GlyphVector</code>.
* These logical bounds have a total of four edges, with two edges
* parallel to the baseline under the glyph's transform and the other two
* edges are shared with adjacent glyphs if they are present. This
* method is useful for hit-testing of the specified glyph,
* positioning of a caret at the leading or trailing edge of a glyph,
* and for drawing a highlight region around the specified glyph.
* @param glyphIndex the index into this <code>GlyphVector</code>
* that corresponds to the glyph from which to retrieve its logical
* bounds
* @return a <code>Shape</code> that is the logical bounds of the
* glyph at the specified <code>glyphIndex</code>.
* @throws IndexOutOfBoundsException if <code>glyphIndex</code>
* is less than 0 or greater than or equal to the number
* of glyphs in this <code>GlyphVector</code>
* @see #getGlyphVisualBounds
*/
public abstract Shape getGlyphLogicalBounds(int glyphIndex);
/**
* Returns the visual bounds of the specified glyph within the
* <code>GlyphVector</code>.
* The bounds returned by this method is positioned around the
* origin of each individual glyph.
* @param glyphIndex the index into this <code>GlyphVector</code>
* that corresponds to the glyph from which to retrieve its visual
* bounds
* @return a <code>Shape</code> that is the visual bounds of the
* glyph at the specified <code>glyphIndex</code>.
* @throws IndexOutOfBoundsException if <code>glyphIndex</code>
* is less than 0 or greater than or equal to the number
* of glyphs in this <code>GlyphVector</code>
* @see #getGlyphLogicalBounds
*/
public abstract Shape getGlyphVisualBounds(int glyphIndex);
/**
* Returns the pixel bounds of the glyph at index when this
* <code>GlyphVector</code> is rendered in a <code>Graphics</code> with the
* given <code>FontRenderContext</code> at the given location. The
* renderFRC need not be the same as the
* <code>FontRenderContext</code> of this
* <code>GlyphVector</code>, and can be null. If it is null, the
* <code>FontRenderContext</code> of this <code>GlyphVector</code>
* is used. The default implementation returns the visual bounds of the glyph,
* offset to x, y and rounded out to the next integer value, and
* ignores the FRC. Subclassers should override this method.
* @param index the index of the glyph.
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