/*
* $RCSfile: PathParser.java,v $
*
* Portions Copyright 2000-2009 Sun Microsystems, Inc. All Rights
* Reserved. Use is subject to license terms.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 only, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License version 2 for more details (a copy is
* included at /legal/license.txt).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this work; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
* Clara, CA 95054 or visit www.sun.com if you need additional
* information or have any questions.
*/
/*****************************************************************************
* Copyright (C) The Apache Software Foundation. All rights reserved. *
* ------------------------------------------------------------------------- *
* This software is published under the terms of the Apache Software License *
* version 1.1, a copy of which has been included with this distribution in *
* the LICENSE file. *
*****************************************************************************/
package com.sun.perseus.parser;
import com.sun.perseus.j2d.Path;
/**
* The <code>PathParser</code> class converts attributes conforming to the
* SVG <a href="http://www.w3.org/TR/SVG11/paths.html#PathDataBNF">path
* syntax</a> with the
* <a href="http://www.w3.org/TR/SVGMobile/#sec-shapes">limitation</a> of SVG
* Tiny which says that SVG Tiny does not support <code>arc to</code> commands.
*
* @version $Id: PathParser.java,v 1.4 2006/04/21 06:40:37 st125089 Exp $
*/
public class PathParser extends NumberParser {
/**
* Current x and y positions in the path, set by
* commands such as moveTo or lineTo.
*/
private float currentX, currentY;
/**
* Last moveTo command.
*/
private float lastMoveToX, lastMoveToY;
/**
* The smoothQCenter point is used for smootg quad curves
*/
private float smoothQCenterX, smoothQCenterY;
/**
* The smoothQCenter point is used for smooth cubic curves
*/
private float smoothCCenterX, smoothCCenterY;
/**
* The GeneralPath under construction
*/
private Path p;
/**
* Returns the current working path. This can be used,
* for example, when the parsePath method throws an error
* to retrieve the state of the path at the time the error
* occured
* @return the <code>Path</code> built from the parsed
* <code>String</code>
*/
public Path getPath() {
return p;
}
/**
* Parses the input <code>String</code> and returns the corresponding
* <code>Path</code>.
*
* @param s the <code>String</code> to parse.
* @return the <code>GeneralPath</code> built from the parsed
* <code>String</code>.
*/
public Path parsePoints(final String s) {
setString(s);
p = preparePath();
setString(s);
current = read();
skipSpaces();
if (current == -1) {
// No coordinate pair
return p;
}
// Initial moveTo
float x = parseNumber();
skipCommaSpaces();
float y = parseNumber();
p.moveTo(x, y);
lastMoveToX = x;
lastMoveToY = y;
while (current != -1) {
skipSpaces();
if (current != -1) {
skipCommaSpaces();
x = parseNumber();
skipCommaSpaces();
y = parseNumber();
p.lineTo(x, y);
}
}
return p;
}
/**
* Pre-parses the path data to allocate the optimal number of commands and data
* for the path.
*
* @return p a path with the proper capacity for the comming path.
*/
protected Path preparePath() {
int commandCapacity = 0;
int dataCapacity = 0;
current = read();
while (current != -1) {
skipCommaSpaces();
switch (current) {
case 'z':
case 'Z':
commandCapacity++;
break;
case 'm':
case 'l':
case 'M':
case 'L':
case 'h':
case 'H':
case 'v':
case 'V':
commandCapacity++;
dataCapacity += 1;
break;
case 'c':
case 'C':
case 's':
case 'S':
commandCapacity++;
dataCapacity += 3;
break;
case 'q':
case 'Q':
case 't':
case 'T':
commandCapacity++;
dataCapacity += 2;
break;
default:
break;
}
current = read();
}
return new Path(commandCapacity, dataCapacity);
}
/**
* Parses the input <code>String</code> and returns the corresponding
* <code>Path</code> if no error is found. If an error occurs,
* this method throws an <code>IllegalArgumentException</code>.
*
* @param s the <code>String</code> to parse.
* @return the <code>Path</code> built from the parsed
* <code>String</code>
*/
public Path parsePath(final String s) {
setString(s);
p = preparePath();
setString(s);
currentX = 0;
currentY = 0;
smoothQCenterX = 0;
smoothQCenterY = 0;
smoothCCenterX = 0;
smoothCCenterY = 0;
current = read();
skipSpaces();
// Multiple coordinate pairs after a moveto
// are like a moveto followed by lineto
switch(current) {
case 'm':
parsem();
parsel();
break;
case 'M':
parseM();
parseL();
break;
case -1:
//an empty path is valid.
break;
default:
throw new IllegalArgumentException();
}
loop: for (;;) {
switch (current) {
case 0xD:
case 0xA:
case 0x20:
case 0x9:
current = read();
break;
case 'z':
case 'Z':
current = read();
p.close();
currentX = lastMoveToX;
currentY = lastMoveToY;
break;
case 'm':
parsem();
case 'l':
parsel();
break;
case 'M':
parseM();
case 'L':
parseL();
break;
case 'h':
parseh();
break;
case 'H':
parseH();
break;
case 'v':
parsev();
break;
case 'V':
parseV();
break;
case 'c':
parsec();
break;
case 'C':
parseC();
break;
case 'q':
parseq();
break;
case 'Q':
parseQ();
break;
case 's':
parses();
break;
case 'S':
parseS();
break;
case 't':
parset();
break;
case 'T':
parseT();
break;
case -1:
break loop;
default:
throw new IllegalArgumentException();
}
}
skipSpaces();
if (current != -1) {
throw new IllegalArgumentException();
}
return p;
}
/**
* Parses a 'm' command.
*/
protected final void parsem() {
current = read();
skipSpaces();
final float x = parseNumber();
skipCommaSpaces();
final float y = parseNumber();
currentX += x;
smoothQCenterX = currentX;
smoothCCenterX = currentX;
currentY += y;
smoothQCenterY = currentY;
smoothCCenterY = currentY;
p.moveTo(smoothCCenterX, smoothCCenterY);
lastMoveToX = smoothCCenterX;
lastMoveToY = smoothCCenterY;
skipCommaSpaces();
}
/**
* Parses a 'l' command.
*/
protected final void parsel() {
if (current == 'l') {
current = read();
}
skipSpaces();
for (;;) {
switch (current) {
case '+': case '-': case '.':
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
float x = parseNumber();
skipCommaSpaces();
float y = parseNumber();
currentX += x;
smoothQCenterX = currentX;
smoothCCenterX = currentX;
currentY += y;
smoothQCenterY = currentY;
smoothCCenterY = currentY;
p.lineTo(smoothCCenterX, smoothCCenterY);
break;
default:
return;
}
skipCommaSpaces();
}
}
/**
* Parses a 'M' command.
*/
protected final void parseM() {
current = read();
skipSpaces();
float x = parseNumber();
skipCommaSpaces();
float y = parseNumber();
currentX = x;
smoothQCenterX = x;
smoothCCenterX = x;
currentY = y;
smoothQCenterY = y;
smoothCCenterY = y;
p.moveTo(x, y);
lastMoveToX = x;
lastMoveToY = y;
skipCommaSpaces();
}
/**
* Parses a 'L' command.
*/
protected final void parseL() {
if (current == 'L') {
current = read();
}
skipSpaces();
for (;;) {
switch (current) {
case '+': case '-': case '.':
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
float x = parseNumber();
skipCommaSpaces();
float y = parseNumber();
currentX = x;
smoothQCenterX = x;
smoothCCenterX = x;
currentY = y;
smoothQCenterY = y;
smoothCCenterY = y;
p.lineTo(smoothCCenterX, smoothCCenterY);
break;
default:
return;
}
skipCommaSpaces();
}
}
/**
* Parses a 'h' command.
*/
protected final void parseh() {
current = read();
skipSpaces();
for (;;) {
switch (current) {
case '+': case '-': case '.':
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
float x = parseNumber();
currentX += x;
smoothQCenterX = currentX;
smoothCCenterX = currentX;
smoothQCenterY = currentY;
smoothCCenterY = currentY;
p.lineTo(smoothCCenterX, smoothCCenterY);
break;
default:
return;
}
skipCommaSpaces();
}
}
/**
* Parses a 'H' command.
*/
protected final void parseH() {
current = read();
skipSpaces();
for (;;) {
switch (current) {
case '+': case '-': case '.':
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
float x = parseNumber();
currentX = x;
smoothQCenterX = x;
smoothCCenterX = x;
smoothQCenterY = currentY;
smoothCCenterY = currentY;
p.lineTo(smoothCCenterX, smoothCCenterY);
break;
default:
return;
}
skipCommaSpaces();
}
}
/**
* Parses a 'v' command.
*/
protected final void parsev() {
current = read();
skipSpaces();
for (;;) {
switch (current) {
case '+': case '-': case '.':
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
float y = parseNumber();
smoothQCenterX = currentX;
smoothCCenterX = currentX;
currentY += y;
smoothQCenterY = currentY;
smoothCCenterY = currentY;
p.lineTo(smoothCCenterX, smoothCCenterY);
break;
default:
return;
}
skipCommaSpaces();
}
}
/**
* Parses a 'V' command.
*/
protected final void parseV() {
current = read();
skipSpaces();
for (;;) {
switch (current) {
case '+': case '-': case '.':
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
float y = parseNumber();
smoothQCenterX = currentX;
smoothCCenterX = currentX;
currentY = y;
smoothQCenterY = y;
smoothCCenterY = y;
p.lineTo(smoothCCenterX, smoothCCenterY);
break;
default:
return;
}
skipCommaSpaces();
}
}
/**
* Parses a 'c' command.
*/
protected final void parsec() {
current = read();
skipSpaces();
for (;;) {
switch (current) {
default:
return;
case '+': case '-': case '.':
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
}
float x1 = parseNumber();
skipCommaSpaces();
float y1 = parseNumber();
skipCommaSpaces();
float x2 = parseNumber();
skipCommaSpaces();
float y2 = parseNumber();
skipCommaSpaces();
float x = parseNumber();
skipCommaSpaces();
float y = parseNumber();
smoothCCenterX = currentX + x2;
smoothCCenterY = currentY + y2;
smoothQCenterX = currentX + x;
smoothQCenterY = currentY + y;
p.curveTo(currentX + x1, currentY + y1,
smoothCCenterX, smoothCCenterY,
smoothQCenterX, smoothQCenterY);
currentX = smoothQCenterX;
currentY = smoothQCenterY;
skipCommaSpaces();
}
}
/**
* Parses a 'C' command.
*/
protected final void parseC() {
current = read();
skipSpaces();
for (;;) {
switch (current) {
default:
return;
case '+': case '-': case '.':
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
}
float x1 = parseNumber();
skipCommaSpaces();
float y1 = parseNumber();
skipCommaSpaces();
float x2 = parseNumber();
skipCommaSpaces();
float y2 = parseNumber();
skipCommaSpaces();
float x = parseNumber();
skipCommaSpaces();
float y = parseNumber();
smoothCCenterX = x2;
smoothCCenterY = y2;
currentX = x;
currentY = y;
p.curveTo(x1, y1, smoothCCenterX, smoothCCenterY,
currentX, currentY);
smoothQCenterX = currentX;
smoothQCenterY = currentY;
skipCommaSpaces();
}
}
/**
* Parses a 'q' command.
*/
protected final void parseq() {
current = read();
skipSpaces();
for (;;) {
switch (current) {
default:
return;
case '+': case '-': case '.':
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
}
float x1 = parseNumber();
skipCommaSpaces();
float y1 = parseNumber();
skipCommaSpaces();
float x = parseNumber();
skipCommaSpaces();
float y = parseNumber();
smoothQCenterX = currentX + x1;
smoothQCenterY = currentY + y1;
currentX += x;
currentY += y;
p.quadTo(smoothQCenterX, smoothQCenterY, currentX, currentY);
smoothCCenterX = currentX;
smoothCCenterY = currentY;
skipCommaSpaces();
}
}
/**
* Parses a 'Q' command.
*/
protected final void parseQ() {
current = read();
skipSpaces();
for (;;) {
switch (current) {
default:
return;
case '+': case '-': case '.':
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
}
float x1 = parseNumber();
skipCommaSpaces();
float y1 = parseNumber();
skipCommaSpaces();
float x = parseNumber();
skipCommaSpaces();
float y = parseNumber();
smoothQCenterX = x1;
smoothQCenterY = y1;
currentX = x;
currentY = y;
p.quadTo(smoothQCenterX, smoothQCenterY, currentX, currentY);
smoothCCenterX = currentX;
smoothCCenterY = currentY;
skipCommaSpaces();
}
}
/**
* Parses a 's' command.
*/
protected final void parses() {
current = read();
skipSpaces();
for (;;) {
switch (current) {
default:
return;
case '+': case '-': case '.':
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
}
float x2 = parseNumber();
skipCommaSpaces();
float y2 = parseNumber();
skipCommaSpaces();
float x = parseNumber();
skipCommaSpaces();
float y = parseNumber();
float smoothX = currentX * 2 - smoothCCenterX;
float smoothY = currentY * 2 - smoothCCenterY;
smoothCCenterX = currentX + x2;
smoothCCenterY = currentY + y2;
currentX += x;
currentY += y;
p.curveTo(smoothX, smoothY,
smoothCCenterX, smoothCCenterY,
currentX, currentY);
smoothQCenterX = currentX;
smoothQCenterY = currentY;
skipCommaSpaces();
}
}
/**
* Parses a 'S' command.
*/
protected final void parseS() {
current = read();
skipSpaces();
for (;;) {
switch (current) {
default:
return;
case '+': case '-': case '.':
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
}
float x2 = parseNumber();
skipCommaSpaces();
float y2 = parseNumber();
skipCommaSpaces();
float x = parseNumber();
skipCommaSpaces();
float y = parseNumber();
float smoothX = currentX * 2 - smoothCCenterX;
float smoothY = currentY * 2 - smoothCCenterY;
currentX = x;
currentY = y;
p.curveTo(smoothX, smoothY,
x2, y2,
currentX, currentY);
smoothCCenterX = x2;
smoothCCenterY = y2;
smoothQCenterX = currentX;
smoothQCenterY = currentY;
skipCommaSpaces();
}
}
/**
* Parses a 't' command.
*/
protected final void parset() {
current = read();
skipSpaces();
for (;;) {
switch (current) {
default:
return;
case '+': case '-': case '.':
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
}
float x = parseNumber();
skipCommaSpaces();
float y = parseNumber();
smoothQCenterX = currentX * 2 - smoothQCenterX;
smoothQCenterY = currentY * 2 - smoothQCenterY;
currentX += x;
currentY += y;
p.quadTo(smoothQCenterX, smoothQCenterY, currentX, currentY);
smoothCCenterX = currentX;
smoothCCenterY = currentY;
skipCommaSpaces();
}
}
/**
* Parses a 'T' command.
*/
protected final void parseT() {
current = read();
skipSpaces();
for (;;) {
switch (current) {
default:
return;
case '+': case '-': case '.':
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
}
float x = parseNumber();
skipCommaSpaces();
float y = parseNumber();
smoothQCenterX = currentX * 2 - smoothQCenterX;
smoothQCenterY = currentY * 2 - smoothQCenterY;
currentX = x;
currentY = y;
p.quadTo(smoothQCenterX, smoothQCenterY,
currentX, currentY);
smoothCCenterX = currentX;
smoothCCenterY = currentY;
skipCommaSpaces();
}
}
}