com.sun.prism.impl.paint

Class LinearGradientContext

java.lang.Object

com.sun.prism.impl.paint.MultipleGradientContext

com.sun.prism.impl.paint.LinearGradientContext

final class LinearGradientContext
extends MultipleGradientContext

Provides the actual implementation for the LinearGradientPaint. This is where the pixel processing is done.

See Also:

LinearGradientPaint, PaintContext, Paint

Field Summary

Fields

Modifier and Type	Field and Description
private float	dgdX The following invariants are used to process the gradient value from a device space coordinate, (X, Y): g(X, Y) = dgdX*X + dgdY*Y + gc
private float	dgdY The following invariants are used to process the gradient value from a device space coordinate, (X, Y): g(X, Y) = dgdX*X + dgdY*Y + gc
private float	gc The following invariants are used to process the gradient value from a device space coordinate, (X, Y): g(X, Y) = dgdX*X + dgdY*Y + gc

Fields inherited from class com.sun.prism.impl.paint.MultipleGradientContext

a00, a01, a02, a10, a11, a12, cycleMethod, fastGradientArraySize, gradient, GRADIENT_SIZE, GRADIENT_SIZE_INDEX, isSimpleLookup

Constructor Summary

Constructors

Constructor and Description
LinearGradientContext(LinearGradient paint, BaseTransform t, float startx, float starty, float endx, float endy, float[] fractions, Color[] colors, int cycleMethod) Constructor for LinearGradientContext.

Method Summary

Modifier and Type	Method and Description
protected void	fillRaster(int[] pixels, int off, int adjust, int x, int y, int w, int h) Return a Raster containing the colors generated for the graphics operation.

Methods inherited from class com.sun.prism.impl.paint.MultipleGradientContext

indexIntoGradientsArrays

Methods inherited from class java.lang.Object

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

Field Detail

dgdX

private float dgdX

The following invariants are used to process the gradient value from a device space coordinate, (X, Y): g(X, Y) = dgdX*X + dgdY*Y + gc

dgdY

private float dgdY

The following invariants are used to process the gradient value from a device space coordinate, (X, Y): g(X, Y) = dgdX*X + dgdY*Y + gc

gc

private float gc

The following invariants are used to process the gradient value from a device space coordinate, (X, Y): g(X, Y) = dgdX*X + dgdY*Y + gc

Constructor Detail

LinearGradientContext

LinearGradientContext(LinearGradient paint,
                      BaseTransform t,
                      float startx,
                      float starty,
                      float endx,
                      float endy,
                      float[] fractions,
                      Color[] colors,
                      int cycleMethod)

Constructor for LinearGradientContext.

Parameters:

paint - the LinearGradientPaint from which this context is created

t - the AffineTransform from user space into device space (gradientTransform should be concatenated with this)

dStart - gradient start point, in user space

dEnd - gradient end point, in user space

fractions - the fractions specifying the gradient distribution

colors - the gradient colors

cycleMethod - either NO_CYCLE, REFLECT, or REPEAT

Method Detail

fillRaster

protected void fillRaster(int[] pixels,
                          int off,
                          int adjust,
                          int x,
                          int y,
                          int w,
                          int h)

Return a Raster containing the colors generated for the graphics operation. This is where the area is filled with colors distributed linearly.

Specified by:

fillRaster in class MultipleGradientContext

Parameters:

x,y,w,h - the area in device space for which colors are generated.