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/*
* Copyright 1999-2004 The Apache Software Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* $Id$ */
package org.apache.fop.layoutmgr;
// Java
import java.awt.geom.Rectangle2D;
// FOP
import org.apache.fop.area.inline.Image;
import org.apache.fop.area.inline.InlineArea;
import org.apache.fop.area.inline.Viewport;
import org.apache.fop.datatypes.Length;
import org.apache.fop.fo.flow.ExternalGraphic;
/**
* LayoutManager for the fo:external-graphic formatting object
*/
public class ExternalGraphicLayoutManager extends LeafNodeLayoutManager {
private ExternalGraphic fobj;
private int breakAfter;
private int breakBefore;
private int align;
private int startIndent;
private int endIndent;
private int spaceBefore;
private int spaceAfter;
private int viewWidth = -1;
private int viewHeight = -1;
private boolean clip = false;
private Rectangle2D placement = null;
/**
* Constructor
*
* @param node the fo:external-graphic formatting object that creates the area
*/
public ExternalGraphicLayoutManager(ExternalGraphic node) {
super(node);
fobj = node;
setup();
InlineArea area = getExternalGraphicInlineArea();
setCurrentArea(area);
setAlignment(fobj.getVerticalAlign());
setLead(viewHeight);
}
/**
* Setup this image.
* This gets the sizes for the image and the dimensions and clipping.
* @todo see if can simplify property handling logic
*/
private void setup() {
// assume lr-tb for now and just use the .optimum value of the range
Length ipd = fobj.getInlineProgressionDimension().getOptimum().getLength();
if (ipd.getEnum() != EN_AUTO) {
viewWidth = ipd.getValue();
} else {
ipd = fobj.getWidth();
if (ipd.getEnum() != EN_AUTO) {
viewWidth = ipd.getValue();
}
}
Length bpd = fobj.getBlockProgressionDimension().getOptimum().getLength();
if (bpd.getEnum() != EN_AUTO) {
viewHeight = bpd.getValue();
} else {
bpd = fobj.getHeight();
if (bpd.getEnum() != EN_AUTO) {
viewHeight = bpd.getValue();
}
}
int cwidth = -1;
int cheight = -1;
Length ch = fobj.getContentHeight();
if (ch.getEnum() != EN_AUTO) {
if (ch.getEnum() == EN_SCALE_TO_FIT) {
if (viewHeight != -1) {
cheight = viewHeight;
}
} else {
cheight = ch.getValue();
}
}
Length cw = fobj.getContentWidth();
if (cw.getEnum() != EN_AUTO) {
if (cw.getEnum() == EN_SCALE_TO_FIT) {
if (viewWidth != -1) {
cwidth = viewWidth;
}
} else {
cwidth = cw.getValue();
}
}
int scaling = fobj.getScaling();
if ((scaling == EN_UNIFORM) || (cwidth == -1) || cheight == -1) {
if (cwidth == -1 && cheight == -1) {
cwidth = fobj.getIntrinsicWidth();
cheight = fobj.getIntrinsicHeight();
} else if (cwidth == -1) {
cwidth = (int)(fobj.getIntrinsicWidth() * (double)cheight
/ fobj.getIntrinsicHeight());
} else if (cheight == -1) {
cheight = (int)(fobj.getIntrinsicHeight() * (double)cwidth
/ fobj.getIntrinsicWidth());
} else {
// adjust the larger
double rat1 = cwidth / fobj.getIntrinsicWidth();
double rat2 = cheight / fobj.getIntrinsicHeight();
if (rat1 < rat2) {
// reduce cheight
cheight = (int)(rat1 * fobj.getIntrinsicHeight());
} else if (rat1 > rat2) {
cwidth = (int)(rat2 * fobj.getIntrinsicWidth());
}
}
}
if (viewWidth == -1) {
viewWidth = cwidth;
}
if (viewHeight == -1) {
viewHeight = cheight;
}
if (cwidth > viewWidth || cheight > viewHeight) {
int overflow = fobj.getOverflow();
if (overflow == EN_HIDDEN) {
clip = true;
} else if (overflow == EN_ERROR_IF_OVERFLOW) {
fobj.getLogger().error("Image: " + fobj.getURL()
+ " overflows the viewport, clipping to viewport");
clip = true;
}
}
int xoffset = 0;
int yoffset = 0;
switch(fobj.getDisplayAlign()) {
case EN_BEFORE:
break;
case EN_AFTER:
yoffset = viewHeight - cheight;
break;
case EN_CENTER:
yoffset = (viewHeight - cheight) / 2;
break;
case EN_AUTO:
default:
break;
}
switch(fobj.getTextAlign()) {
case EN_CENTER:
xoffset = (viewWidth - cwidth) / 2;
break;
case EN_END:
xoffset = viewWidth - cwidth;
break;
case EN_START:
break;
case EN_JUSTIFY:
default:
break;
}
placement = new Rectangle2D.Float(xoffset, yoffset, cwidth, cheight);
}
/**
* Get the inline area for this external grpahic.
* This creates the image area and puts it inside a viewport.
*
* @return the viewport containing the image area
*/
public InlineArea getExternalGraphicInlineArea() {
Image imArea = new Image(fobj.getSrc());
Viewport vp = new Viewport(imArea);
vp.setIPD(viewWidth);
vp.setBPD(viewHeight);
vp.setClip(clip);
vp.setContentPosition(placement);
vp.setOffset(0);
// Common Border, Padding, and Background Properties
TraitSetter.addBorders(vp, fobj.getCommonBorderPaddingBackground());
TraitSetter.addBackground(vp, fobj.getCommonBorderPaddingBackground());
return vp;
}
protected void addId() {
getPSLM().addIDToPage(fobj.getId());
}
}
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