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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.pdf;
-
- import java.awt.Shape;
- import java.util.ArrayList;
- import java.util.HashMap;
- import java.util.Iterator;
- import java.awt.geom.GeneralPath;
- import java.awt.geom.Area;
-
- import java.awt.Color;
- import java.awt.Paint;
- import java.awt.geom.AffineTransform;
-
- /**
- * This keeps information about the current state when writing to pdf.
- * It allows for creating new graphics states with the q operator.
- * This class is only used to store the information about the state
- * the caller needs to handle the actual pdf operators.
- *
- * When setting the state for pdf there are three possible ways of
- * handling the situation.
- * The values can be set to override previous or default values.
- * A new state can be added and then the values set.
- * The current state can be popped and values will return to a
- * previous state then the necessary values can be overridden.
- * The current transform behaves differently to other values as the
- * matrix is combined with the current resolved value.
- * It is impossible to optimise the result without analysing the all
- * the possible combinations after completing.
- */
- public class PDFState {
- private static final String COLOR = "color";
- private static final String BACKCOLOR = "backcolor";
- private static final String PAINT = "paint";
- private static final String BACKPAINT = "backpaint";
- private static final String LINECAP = "lineCap";
- private static final String LINEJOIN = "lineJoin";
- private static final String LINEWIDTH = "lineWidth";
- private static final String MITERLIMIT = "miterLimit";
- private static final String TEXT = "text";
- private static final String DASHOFFSET = "dashOffset";
- private static final String DASHARRAY = "dashArray";
- private static final String TRANSFORM = "transform";
- private static final String FONTSIZE = "fontSize";
- private static final String FONTNAME = "fontName";
- private static final String CLIP = "clip";
- private static final String GSTATE = "gstate";
-
- private Color color = Color.black;
- private Color backcolor = Color.white;
- private Paint paint = null;
- private Paint backPaint = null;
- private int lineCap = 0;
- private int lineJoin = 0;
- private float lineWidth = 1;
- private float miterLimit = 0;
- private boolean text = false;
- private int dashOffset = 0;
- private int[] dashArray = new int[0];
- private AffineTransform transform = new AffineTransform();
- private float fontSize = 0;
- private String fontName = "";
- private Shape clip = null;
- private PDFGState gstate = null;
-
- private ArrayList stateStack = new ArrayList();
-
- /**
- * PDF State for storing graphics state.
- */
- public PDFState() {
-
- }
-
- /**
- * Push the current state onto the stack.
- * This call should be used when the q operator is used
- * so that the state is known when popped.
- */
- public void push() {
- HashMap saveMap = new HashMap();
- saveMap.put(COLOR, color);
- saveMap.put(BACKCOLOR, backcolor);
- saveMap.put(PAINT, paint);
- saveMap.put(BACKPAINT, backPaint);
- saveMap.put(LINECAP, new Integer(lineCap));
- saveMap.put(LINEJOIN, new Integer(lineJoin));
- saveMap.put(LINEWIDTH, new Float(lineWidth));
- saveMap.put(MITERLIMIT, new Float(miterLimit));
- saveMap.put(TEXT, new Boolean(text));
- saveMap.put(DASHOFFSET, new Integer(dashOffset));
- saveMap.put(DASHARRAY, dashArray);
- saveMap.put(TRANSFORM, transform);
- saveMap.put(FONTSIZE, new Float(fontSize));
- saveMap.put(FONTNAME, fontName);
- saveMap.put(CLIP, clip);
- saveMap.put(GSTATE, gstate);
-
- stateStack.add(saveMap);
-
- transform = new AffineTransform();
- }
-
- /**
- * Pop the state from the stack and set current values to popped state.
- * This should be called when a Q operator is used so
- * the state is restored to the correct values.
- */
- public void pop() {
- if (getStackLevel() > 0) {
- HashMap saveMap = (HashMap)stateStack.get(stateStack.size() - 1);
- stateStack.remove(stateStack.size() - 1);
- color = (Color)saveMap.get(COLOR);
- backcolor = (Color)saveMap.get(BACKCOLOR);
- paint = (Paint)saveMap.get(PAINT);
- backPaint = (Paint)saveMap.get(BACKPAINT);
- lineCap = ((Integer)saveMap.get(LINECAP)).intValue();
- lineJoin = ((Integer)saveMap.get(LINEJOIN)).intValue();
- lineWidth = ((Float)saveMap.get(LINEWIDTH)).floatValue();
- miterLimit = ((Float)saveMap.get(MITERLIMIT)).floatValue();
- text = ((Boolean)saveMap.get(TEXT)).booleanValue();
- dashOffset = ((Integer)saveMap.get(DASHOFFSET)).intValue();
- dashArray = (int[])saveMap.get(DASHARRAY);
- transform = (AffineTransform)saveMap.get(TRANSFORM);
- fontSize = ((Float)saveMap.get(FONTSIZE)).floatValue();
- fontName = (String)saveMap.get(FONTNAME);
- clip = (Shape)saveMap.get(CLIP);
- gstate = (PDFGState)saveMap.get(GSTATE);
- }
- }
-
- /**
- * Get the current stack level.
- *
- * @return the current stack level
- */
- public int getStackLevel() {
- return stateStack.size();
- }
-
- /**
- * Restore the state to a particular level.
- * this can be used to restore to a known level without making
- * multiple pop calls.
- *
- * @param stack the level to restore to
- */
- public void restoreLevel(int stack) {
- int pos = stack;
- while (stateStack.size() > pos + 1) {
- stateStack.remove(stateStack.size() - 1);
- }
- if (stateStack.size() > pos) {
- pop();
- }
- }
-
- /**
- * Set the current line dash.
- * Check if setting the line dash to the given values
- * will make a change and then set the state to the new values.
- *
- * @param array the line dash array
- * @param offset the line dash start offset
- * @return true if the line dash has changed
- */
- public boolean setLineDash(int[] array, int offset) {
- return false;
- }
-
- /**
- * Set the current color.
- * Check if the new color is a change and then set the current color.
- *
- * @param col the color to set
- * @return true if the color has changed
- */
- public boolean setColor(Color col) {
- if (!col.equals(color)) {
- color = col;
- return true;
- }
- return false;
- }
-
- /**
- * Set the current background color.
- * Check if the background color will change and then set the new color.
- *
- * @param col the new background color
- * @return true if the background color has changed
- */
- public boolean setBackColor(Color col) {
- if (!col.equals(backcolor)) {
- backcolor = col;
- return true;
- }
- return false;
- }
-
- /**
- * Set the current paint.
- * This checks if the paint will change and then sets the current paint.
- *
- * @param p the new paint
- * @return true if the new paint changes the current paint
- */
- public boolean setPaint(Paint p) {
- if (paint == null) {
- if (p != null) {
- paint = p;
- return true;
- }
- } else if (!paint.equals(p)) {
- paint = p;
- return true;
- }
- return false;
- }
-
- /**
- * Check if the clip will change the current state.
- * A clip is assumed to be used in a situation where it will add
- * to any clip in the current or parent states.
- * A clip cannot be cleared, this can only be achieved by going to
- * a parent level with the correct clip.
- * If the clip is different then it may start a new state so that
- * it can return to the previous clip.
- *
- * @param cl the clip shape to check
- * @return true if the clip will change the current clip.
- */
- public boolean checkClip(Shape cl) {
- if (clip == null) {
- if (cl != null) {
- return true;
- }
- } else if (!new Area(clip).equals(new Area(cl))) {
- return true;
- }
- // todo check for clips that are larger than the current
- return false;
- }
-
- /**
- * Set the current clip.
- * This either sets a new clip or sets the clip to the intersect of
- * the old clip and the new clip.
- *
- * @param cl the new clip in the current state
- */
- public void setClip(Shape cl) {
- if (clip != null) {
- Area newClip = new Area(clip);
- newClip.intersect(new Area(cl));
- clip = new GeneralPath(newClip);
- } else {
- clip = cl;
- }
- }
-
- /**
- * Check the current transform.
- * The transform for the current state is the combination of all
- * transforms in the current state. The parameter is compared
- * against this current transform.
- *
- * @param tf the transform the check against
- * @return true if the new transform is different then the current transform
- */
- public boolean checkTransform(AffineTransform tf) {
- return !tf.equals(transform);
- }
-
- /**
- * Set a new transform.
- * This transform is appended to the transform of
- * the current graphic state.
- *
- * @param tf the transform to concatonate to the current level transform
- */
- public void setTransform(AffineTransform tf) {
- transform.concatenate(tf);
- }
-
- /**
- * Get the current transform.
- * This gets the combination of all transforms in the
- * current state.
- *
- * @return the calculate combined transform for the current state
- */
- public AffineTransform getTransform() {
- AffineTransform tf;
- AffineTransform at = new AffineTransform();
- for (Iterator iter = stateStack.iterator(); iter.hasNext();) {
- HashMap map = (HashMap)iter.next();
- tf = (AffineTransform)map.get(TRANSFORM);
- at.concatenate(tf);
- }
- at.concatenate(transform);
-
- return at;
- }
-
- /**
- * Get the grapics state.
- * This gets the combination of all graphic states for
- * the current context.
- * This is the graphic state set with the gs operator not
- * the other graphic state changes.
- *
- * @return the calculated ExtGState in the current context
- */
- public PDFGState getGState() {
- PDFGState defaultState = PDFGState.DEFAULT;
-
- PDFGState state;
- PDFGState newstate = new PDFGState();
- newstate.addValues(defaultState);
- for (Iterator iter = stateStack.iterator(); iter.hasNext();) {
- HashMap map = (HashMap)iter.next();
- state = (PDFGState)map.get(GSTATE);
- if (state != null) {
- newstate.addValues(state);
- }
- }
- if (gstate != null) {
- newstate.addValues(gstate);
- }
-
- return newstate;
- }
- }
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