下面列出了java.awt.Color#getAlpha ( ) 实例代码，或者点击链接到github查看源代码，也可以在右侧发表评论。
/**
* Paints a single bar instance.
*
* @param g2 the graphics target.
* @param renderer the renderer.
* @param row the row index.
* @param column the column index.
* @param bar the bar
* @param base indicates which side of the rectangle is the base of the
* bar.
* @param pegShadow peg the shadow to the base of the bar?
*/
@Override
public void paintBarShadow(Graphics2D g2, XYBarRenderer renderer, int row,
int column, RectangularShape bar, RectangleEdge base,
boolean pegShadow) {
// handle a special case - if the bar colour has alpha == 0, it is
// invisible so we shouldn't draw any shadow
Paint itemPaint = renderer.getItemPaint(row, column);
if (itemPaint instanceof Color) {
Color c = (Color) itemPaint;
if (c.getAlpha() == 0) {
return;
}
}
RectangularShape shadow = createShadow(bar, renderer.getShadowXOffset(),
renderer.getShadowYOffset(), base, pegShadow);
g2.setPaint(Color.gray);
g2.fill(shadow);
}
/**
* Paints a single bar instance.
*
* @param g2 the graphics target.
* @param renderer the renderer.
* @param row the row index.
* @param column the column index.
* @param bar the bar
* @param base indicates which side of the rectangle is the base of the
* bar.
* @param pegShadow peg the shadow to the base of the bar?
*/
@Override
public void paintBarShadow(Graphics2D g2, XYBarRenderer renderer, int row,
int column, RectangularShape bar, RectangleEdge base,
boolean pegShadow) {
// handle a special case - if the bar colour has alpha == 0, it is
// invisible so we shouldn't draw any shadow
Paint itemPaint = renderer.getItemPaint(row, column);
if (itemPaint instanceof Color) {
Color c = (Color) itemPaint;
if (c.getAlpha() == 0) {
return;
}
}
RectangularShape shadow = createShadow(bar, renderer.getShadowXOffset(),
renderer.getShadowYOffset(), base, pegShadow);
g2.setPaint(Color.gray);
g2.fill(shadow);
}
/**
* Paints a single bar instance.
*
* @param g2 the graphics target.
* @param renderer the renderer.
* @param row the row index.
* @param column the column index.
* @param bar the bar
* @param base indicates which side of the rectangle is the base of the
* bar.
* @param pegShadow peg the shadow to the base of the bar?
*/
@Override
public void paintBarShadow(Graphics2D g2, XYBarRenderer renderer, int row,
int column, RectangularShape bar, RectangleEdge base,
boolean pegShadow) {
// handle a special case - if the bar colour has alpha == 0, it is
// invisible so we shouldn't draw any shadow
Paint itemPaint = renderer.getItemPaint(row, column);
if (itemPaint instanceof Color) {
Color c = (Color) itemPaint;
if (c.getAlpha() == 0) {
return;
}
}
RectangularShape shadow = createShadow(bar, renderer.getShadowXOffset(),
renderer.getShadowYOffset(), base, pegShadow);
g2.setPaint(Color.gray);
g2.fill(shadow);
}
/**
* Paints a single bar instance.
*
* @param g2 the graphics target.
* @param renderer the renderer.
* @param row the row index.
* @param column the column index.
* @param bar the bar
* @param base indicates which side of the rectangle is the base of the
* bar.
* @param pegShadow peg the shadow to the base of the bar?
*/
public void paintBarShadow(Graphics2D g2, BarRenderer renderer, int row,
int column, boolean selected, RectangularShape bar,
RectangleEdge base, boolean pegShadow) {
// handle a special case - if the bar colour has alpha == 0, it is
// invisible so we shouldn't draw any shadow
Paint itemPaint = renderer.getItemPaint(row, column, selected);
if (itemPaint instanceof Color) {
Color c = (Color) itemPaint;
if (c.getAlpha() == 0) {
return;
}
}
RectangularShape shadow = createShadow(bar, renderer.getShadowXOffset(),
renderer.getShadowYOffset(), base, pegShadow);
g2.setPaint(renderer.getShadowPaint());
g2.fill(shadow);
}
@Override
public void updateChooser() {
Color color = getColorFromModel();
if (color.getAlpha() != slider.getValue()) {
slider.setValue(color.getAlpha());
}
}
/**
* Tween between two colors.
*
* @param c1
* @param c2
* @param f
* @return
*/
public static final Color tween(Color c1, Color c2, double f) {
if (f <= 0)
return c1;
if (f >= 1)
return c2;
int r = (int) (c1.getRed() * (1 - f) + f * c2.getRed());
int g = (int) (c1.getGreen() * (1 - f) + f * c2.getGreen());
int b = (int) (c1.getBlue() * (1 - f) + f * c2.getBlue());
int a = (int) (c1.getAlpha() * (1 - f) + f * c2.getAlpha());
return new Color(r, g, b, a);
}
protected void setStrokeColor(Color color)
{
int alpha = color.getAlpha();
if (alpha != 255)
{
setStrokeAlpha(alpha);
strokeAlphaSet = true;
}
pdfContentByte.setRGBColorStroke(
color.getRed(),
color.getGreen(),
color.getBlue());
}
public Colour4f(Color src)
{
this.r = (float)(src.getRed()) / 255.0f;
this.g = (float)(src.getGreen()) / 255.0f;
this.b = (float)(src.getBlue()) / 255.0f;
this.a = (float)(src.getAlpha()) / 255.0f;
}
/**
* Draw a border around the graphic.
*
* @param g the Graphic context.
* @param width the width of the border.
* @param height the height of the border.
* @param color the color of the border.
* @param size the spread of the border from outside in, expressed as a
* percentage of the height.
*/
private void drawBorder(Graphics2D g, int width, int height, Color color, float size) {
int max = (int) (Math.min((height - 2) * size, height / 2.0f) + 0.5);
int alphaDelta = color.getAlpha() / max;
for (int i = 0; i < max; i++) {
Shape s = shapeGenerator.createRoundRectangle(i, i, width - 2 * i - 1, height - 2 * i - 1, CornerSize.CHECKBOX_INTERIOR);
Color newColor = new Color(color.getRed(), color.getGreen(), color.getBlue(), color.getAlpha() - i * alphaDelta);
g.setPaint(newColor);
g.draw(s);
}
}
/**
* Derives the ARGB value for a color based on an offset between two
* other colors.
*
* @param color1 The first color
* @param color2 The second color
* @param midPoint The offset between color 1 and color 2, a value of 0.0 is
* color 1 and 1.0 is color 2;
* @return the ARGB value for a new color based on this derivation
*/
static int deriveARGB(Color color1, Color color2, float midPoint) {
int r = color1.getRed() +
Math.round((color2.getRed() - color1.getRed()) * midPoint);
int g = color1.getGreen() +
Math.round((color2.getGreen() - color1.getGreen()) * midPoint);
int b = color1.getBlue() +
Math.round((color2.getBlue() - color1.getBlue()) * midPoint);
int a = color1.getAlpha() +
Math.round((color2.getAlpha() - color1.getAlpha()) * midPoint);
return ((a & 0xFF) << 24) |
((r & 0xFF) << 16) |
((g & 0xFF) << 8) |
(b & 0xFF);
}
@Override
public void drawArea( AreaRenderEvent are ) throws ChartException
{
if ( iv != null )
{
iv.modifyEvent( are );
}
// CHECK IF THE LINE ATTRIBUTES ARE CORRECTLY DEFINED
final LineAttributes lia = are.getOutline( );
if ( !validateLineAttributes( are.getSource( ), lia ) )
{
return;
}
// SETUP THE FOREGROUND COLOR (DARKER BACKGROUND IF DEFINED AS NULL)
final Color cFG = (Color) validateEdgeColor( lia.getColor( ),
are.getBackground( ),
_ids );
// IF UNDEFINED OR TOTALLY TRANSPARENT, EXIT
if ( cFG == null || cFG.getAlpha( ) == 0 )
{
return;
}
// BUILD THE GENERAL PATH STRUCTURE
final GeneralPath gp = new GeneralPath( );
PrimitiveRenderEvent pre;
for ( int i = 0; i < are.getElementCount( ); i++ )
{
pre = are.getElement( i );
if ( pre instanceof ArcRenderEvent )
{
final ArcRenderEvent acre = (ArcRenderEvent) pre;
final Arc2D.Double a2d = new Arc2D.Double( acre.getTopLeft( )
.getX( ),
acre.getTopLeft( ).getY( ),
acre.getWidth( ),
acre.getHeight( ),
acre.getStartAngle( ),
acre.getAngleExtent( ),
toG2dArcType( acre.getStyle( ) ) );
gp.append( a2d, true );
}
else if ( pre instanceof LineRenderEvent )
{
final LineRenderEvent lre = (LineRenderEvent) pre;
final Line2D.Double l2d = new Line2D.Double( lre.getStart( )
.getX( ),
lre.getStart( ).getY( ),
lre.getEnd( ).getX( ),
lre.getEnd( ).getY( ) );
gp.append( l2d, true );
}
}
// DRAW THE GENERAL PATH
Stroke sPrevious = null;
Stroke sCurrent = getCachedStroke( lia );
if ( sCurrent != null ) // SOME STROKE DEFINED?
{
sPrevious = _g2d.getStroke( );
_g2d.setStroke( sCurrent );
}
_g2d.setColor( cFG );
_g2d.draw( gp );
if ( sPrevious != null ) // RESTORE PREVIOUS STROKE
{
_g2d.setStroke( sPrevious );
}
}
@Override
protected Color operateColor(Color color) {
int v = Math.min(Math.max(intPara1, 0), 255);
return new Color(v, color.getGreen(), v, color.getAlpha());
}
protected void buildPalette() {
reduceList = new ColorNode[MAXLEVEL + 1];
for (int i = 0; i < reduceList.length; i++) {
reduceList[i] = null;
}
numNodes = 0;
maxNodes = 0;
root = null;
currSize = 0;
currLevel = MAXLEVEL;
/*
from the book
*/
int w = src.getWidth();
int h = src.getHeight();
for (int y = 0; y < h; y++) {
for (int x = 0; x < w; x++) {
Color aColor = getSrcColor(w - x - 1, h - y - 1);
/*
* If transparency of given image is not opaque we assume all
* colors with alpha less than 1.0 as fully transparent.
*/
if (transparency != Transparency.OPAQUE &&
aColor.getAlpha() != 0xff)
{
if (transColor == null) {
this.requiredSize --; // one slot for transparent color
transColor = new ColorNode();
transColor.isLeaf = true;
}
transColor = insertNode(transColor, aColor, 0);
} else {
root = insertNode(root, aColor, 0);
}
if (currSize > requiredSize) {
reduceTree();
}
}
}
}
@Override
protected Color operateColor(Color color) {
return new Color(255 - color.getRed(), color.getGreen(), color.getBlue(), color.getAlpha());
}
@Override
protected Color operateColor(Color color) {
return new Color(color.getRed(), Math.min(Math.max(intPara1, 0), 255),
color.getBlue(), color.getAlpha());
}
protected void buildPalette() {
reduceList = new ColorNode[MAXLEVEL + 1];
for (int i = 0; i < reduceList.length; i++) {
reduceList[i] = null;
}
numNodes = 0;
maxNodes = 0;
root = null;
currSize = 0;
currLevel = MAXLEVEL;
/*
from the book
*/
int w = src.getWidth();
int h = src.getHeight();
for (int y = 0; y < h; y++) {
for (int x = 0; x < w; x++) {
Color aColor = getSrcColor(w - x - 1, h - y - 1);
/*
* If transparency of given image is not opaque we assume all
* colors with alpha less than 1.0 as fully transparent.
*/
if (transparency != Transparency.OPAQUE &&
aColor.getAlpha() != 0xff)
{
if (transColor == null) {
this.requiredSize --; // one slot for transparent color
transColor = new ColorNode();
transColor.isLeaf = true;
}
transColor = insertNode(transColor, aColor, 0);
} else {
root = insertNode(root, aColor, 0);
}
if (currSize > requiredSize) {
reduceTree();
}
}
}
}
protected void buildPalette() {
reduceList = new ColorNode[MAXLEVEL + 1];
for (int i = 0; i < reduceList.length; i++) {
reduceList[i] = null;
}
numNodes = 0;
maxNodes = 0;
root = null;
currSize = 0;
currLevel = MAXLEVEL;
/*
from the book
*/
int w = src.getWidth();
int h = src.getHeight();
for (int y = 0; y < h; y++) {
for (int x = 0; x < w; x++) {
Color aColor = getSrcColor(w - x - 1, h - y - 1);
/*
* If transparency of given image is not opaque we assume all
* colors with alpha less than 1.0 as fully transparent.
*/
if (transparency != Transparency.OPAQUE &&
aColor.getAlpha() != 0xff)
{
if (transColor == null) {
this.requiredSize --; // one slot for transparent color
transColor = new ColorNode();
transColor.isLeaf = true;
}
transColor = insertNode(transColor, aColor, 0);
} else {
root = insertNode(root, aColor, 0);
}
if (currSize > requiredSize) {
reduceTree();
}
}
}
}
protected void buildPalette() {
reduceList = new ColorNode[MAXLEVEL + 1];
for (int i = 0; i < reduceList.length; i++) {
reduceList[i] = null;
}
numNodes = 0;
maxNodes = 0;
root = null;
currSize = 0;
currLevel = MAXLEVEL;
/*
from the book
*/
int w = src.getWidth();
int h = src.getHeight();
for (int y = 0; y < h; y++) {
for (int x = 0; x < w; x++) {
Color aColor = getSrcColor(w - x - 1, h - y - 1);
/*
* If transparency of given image is not opaque we assume all
* colors with alpha less than 1.0 as fully transparent.
*/
if (transparency != Transparency.OPAQUE &&
aColor.getAlpha() != 0xff)
{
if (transColor == null) {
this.requiredSize --; // one slot for transparent color
transColor = new ColorNode();
transColor.isLeaf = true;
}
transColor = insertNode(transColor, aColor, 0);
} else {
root = insertNode(root, aColor, 0);
}
if (currSize > requiredSize) {
reduceTree();
}
}
}
}
/**
* Creates a new <code>Color</code> that is a darker version of this
* <code>Color</code>. This is a copy of Color.darker(), but lets you choose
* the factor.
* @param c the color to be darkened
* @param factor value < 1.0; Color.darker() uses 0.7
* @return a new <code>Color</code> object that is
* a darker version of this <code>Color</code>
* with the same {@code alpha} value.
*/
public static Color darker(Color c, float factor) {
return new Color(Math.max((int)(c.getRed() *factor), 0),
Math.max((int)(c.getGreen()*factor), 0),
Math.max((int)(c.getBlue() *factor), 0),
c.getAlpha());
}
/**
* Converts a {@link Color} input to a {@link ColorRGB} object including the alpha value.
*
* @param colorRGB
* @return
*/
public static ColorRGB convertColorWithAlphaToColorRGB(Color color) {
return new ColorRGB(color.getRed(), color.getGreen(), color.getBlue(), color.getAlpha());
}