?
????/**
?????*?Constant?to?specify?that?the?bounding?box?should?be?not?be?changed?
?????*?for?any?angle?of?rotation?when?creating?the?rotated?image.??This?
?????*?means?the?returned?image?will?be?the?same?size?as?the?given?image.??
?????*?Of?course,?that?also?means?the?corners?of?the?image?may?be?cut?off.??
?????*/
????public?static?final?int?NO_BOUNDING_BOX?=?0;
?
????/**
?????*?Constant?to?specify?that?the?exact?bounding?box?should?be?used?for?
?????*?the?specified?angle?of?rotation?when?creating?the?rotated?image.??
?????*?This?is?the?default?option.??When?used,?the?rotated?image?may?be?
?????*?larger?then?the?source?image,?but?no?larger?then?needed?to?fit?the?
?????*?rotated?image?exactly.??Therefore,?rotating?the?same?image?to?various?
?????*?angles?may?result?in?varying?image?sizes.??
?????*/
????public?static?final?int?EXACT_BOUNDING_BOX?=?1;
?
????/**
?????*?Constant?to?specify?that?the?largest?bounding?box?should?be?used?when?
?????*?creating?the?rotated?image.??When?used,?the?rotated?image?will?be?
?????*?larger?then?the?source?image,?but?all?rotated?images?of?that?same?
?????*?source?image?will?be?the?same?size,?regardless?of?the?angle?of?
?????*?rotation.??This?may?result?in?significant?"empty?space"?between?the?
?????*?edge?of?the?returned?image?and?the?actual?drawn?pixel?areas.??
?????*/
????public?static?final?int?LARGEST_BOUNDING_BOX?=?2;
????/**
?????*?Rotates?the?specified?image?the?specified?number?of?degrees.??The?
?????*?rotation?is?performed?around?the?center?point?of?the?image.??
?????*?
?????*?@param??img?????????the?image?to?rotate
?????*?@param??degrees?????the?degrees?to?rotate
?????*?@param??bbm?????????the?bounding?box?mode,?default?is?EXACT_BOUNDING_BOX
?????*?@param??background??the?background?paint?(texture,?color?or?gradient),?
?????*?????????????????????can?be?null
?????*?@return??the?image
?????*?@see??#NO_BOUNDING_BOX
?????*?@see??#EXACT_BOUNDING_BOX
?????*?@see??#LARGEST_BOUNDING_BOX
?????*/
????public?static?BufferedImage?rotateDegrees(Image?img,?double?degrees,?int?bbm,?Paint?background)?{
????????return?rotateRadians(img,?Math.toRadians(degrees),?bbm,?background);
????}
?
????/**
?????*?Rotates?the?specified?image?the?specified?number?of?radians.??The?
?????*?rotation?is?performed?around?the?center?point?of?the?image.??This?
?????*?method?is?provided?for?convenience?of?applications?using?radians.??
?????*?For?most?people,?degrees?is?simpler?to?use.??
?????*?
?????*?@param??img?????????the?image?to?rotate
?????*?@param??radians?????the?radians?to?rotate
?????*?@param??bbm?????????the?bounding?box?mode,?default?is?EXACT_BOUNDING_BOX
?????*?@param??background??the?background?paint?(texture,?color?or?gradient),?
?????*?????????????????????can?be?null
?????*?@return??the?image
?????*?@see??#NO_BOUNDING_BOX
?????*?@see??#EXACT_BOUNDING_BOX
?????*?@see??#LARGEST_BOUNDING_BOX
?????*/
????public?static?BufferedImage?rotateRadians(Image?img,?double?radians,?int?bbm,?Paint?background)?{
????????//?get?the?original?image's?width?and?height
????????int?iw?=?img.getWidth(null);
????????int?ih?=?img.getHeight(null);
????????//?calculate?the?new?image's?size?based?on?bounding?box?mode
????????Dimension?dim;
????????if(bbm?==?NO_BOUNDING_BOX)?{
????????????dim?=?new?Dimension(iw,?ih);
????????}?else?if(bbm?==?LARGEST_BOUNDING_BOX)?{
????????????dim?=?getLargestBoundingBox(iw,?ih);
????????}?else?{?//?EXACT_BOUNDING_BOX
????????????dim?=?getBoundingBox(iw,?ih,?Math.toDegrees(radians));
????????}
????????//?get?the?new?image's?width?and?height
????????int?w?=?dim.width;
????????int?h?=?dim.height;
????????//?get?the?location?to?draw?the?original?image?on?the?new?image
????????int?x?=?(w/2)-(iw/2);
????????int?y?=?(h/2)-(ih/2);
????????//?need?to?copy?the?given?image?to?a?new?BufferedImage?because?
????????//?it?is,?in?most?cases,?going?to?be?a?larger?image?so?it?
????????//?needs?to?be?drawn?centered?on?the?larger?image
????????BufferedImage?bi?=?new?BufferedImage(w,?h,?BufferedImage.TYPE_INT_ARGB);
????????Graphics2D?g2d?=?bi.createGraphics();
????????//?set?some?rendering?hints?for?better?looking?images
????????g2d.setRenderingHints(renderingHints);
????????//?draw?the?background?paint,?if?necessary
????????if(background?!=?null)?{
????????????g2d.setPaint(background);
????????????g2d.fillRect(0,?0,?w,?h);
????????}
????????//?if?not?rotating,?just?draw?it?normally,?else?create?a?transform
????????if(radians?==?0.0)?{
????????????g2d.drawImage(img,?x,?y,?iw,?ih,?null);
????????}?else?{
????????????g2d.rotate(radians,?w/2,?h/2);
????????????g2d.translate(x,?y);
????????????g2d.drawImage(img,?0,?0,?iw,?ih,?null);
????????}
????????g2d.dispose();
????????return?bi;
????}
?
????/**
?????*?Gets?the?largest?bounding?box?size?that?can?hold?an?image?of?the?
?????*?specified?size?at?any?angle?of?rotation.??
?????*?
?????*?@param??width???the?image?width
?????*?@param??height??the?image?height
?????*?@return??the?bounding?box?size
?????*/
????public?static?Dimension?getLargestBoundingBox(int?width,?int?height)?{
????????//?The?largest?bounding?box?is?the?largest?area?needed?to?fit?the?
????????//?specified?image?at?any?angle?or?rotation.??This?is?simpler?then?
????????//?getting?the?bounding?box?for?a?given?angle?because?the?largest?
????????//?box?will?put?the?corner?of?the?image?box?directly?along?the?
????????//?vertical?or?horizontal?axis?from?the?image?center?point.??The?
????????//?distance?between?the?image?rectangle's?center?and?any?corner?
????????//?is?the?hypotenuse?of?a?right?triangle?who's?other?sides?are?
????????//?half?the?width?(a)?and?half?the?height?(b)?of?the?rectangle.??
????????//?A?little?a^2?+?b^2?=?c^2?calculation?and?we?get?the?length?of?
????????//?the?hypotenuse.??Double?that?to?get?a?square?within?which?the?
????????//?image?can?be?rotated?at?any?angle?without?clipping?the?image.??
????????double?a?=?(double)width?/?2.0;
????????double?b?=?(double)height?/?2.0;
????????//?use?Math.ceil()?to?round?up?to?an?int?value
????????int?c?=?(int)Math.ceil(Math.sqrt((a?*?a)?+?(b?*?b))?*?2.0);
????????return?new?Dimension(c,?c);
????}
?
????/**
?????*?Gets?the?optimal/smallest?bounding?box?size?that?can?hold?an?image?of?
?????*?the?specified?size?at?the?specified?angle?of?rotation.??
?????*?
?????*?@param??width???the?image?width
?????*?@param??height??the?image?height
?????*?@return??the?bounding?box?size
?????*/
????public?static?Dimension?getBoundingBox(int?width,?int?height,?double?degrees)?{
????????degrees?=?normalizeDegrees(degrees);
????????//?if?no?rotation?or?180?degrees,?the?size?won't?change
????????if(degrees?==?0.0?||?degrees?==?180.0)?{
????????????return?new?Dimension(width,?height);
????????}
????????//?if?90?or?270?(quarter?or?3-quarter?rotations)?the?width?becomes?
????????//?the?height,?and?vice?versa
????????if(degrees?==?90.0?||?degrees?==?270.0)?{
????????????return?new?Dimension(height,?width);
????????}
????????//?for?any?other?rotation,?we?need?to?do?some?trigonometry,?
????????//?derived?from?description?found?at:??
????????//?http://www.codeproject.com/csharp/rotateimage.asp
????????double?radians?=?Math.toRadians(degrees);
????????double?aW?=?Math.abs(Math.cos(radians)?*?width);
????????double?oW?=?Math.abs(Math.sin(radians)?*?width);
????????double?aH?=?Math.abs(Math.cos(radians)?*?height);
????????double?oH?=?Math.abs(Math.sin(radians)?*?height);
????????//?use?Math.ceil()?to?round?up?to?an?int?value
????????int?w?=?(int)Math.ceil(aW?+?oH);
????????int?h?=?(int)Math.ceil(oW?+?aH);
????????return?new?Dimension(w,?h);
????}
posted on 2005-09-22 07:26
Pudgy's World 閱讀(287)
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