/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.render.ps;
import java.awt.Color;
import java.awt.Point;
import java.io.IOException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.xmlgraphics.ps.PSGenerator;
import org.apache.fop.fo.Constants;
import org.apache.fop.render.intermediate.ArcToBezierCurveTransformer;
import org.apache.fop.render.intermediate.BezierCurvePainter;
import org.apache.fop.render.intermediate.BorderPainter;
import org.apache.fop.render.intermediate.GraphicsPainter;
import org.apache.fop.traits.RuleStyle;
import org.apache.fop.util.ColorUtil;
/**
* PostScript-specific implementation of the {@link BorderPainter}.
*/
public class PSGraphicsPainter implements GraphicsPainter, BezierCurvePainter {
/** logging instance */
private static Log log = LogFactory.getLog(PSGraphicsPainter.class);
private final PSGenerator generator;
/** Used for drawing arcs since PS does not natively support drawing elliptic curves */
private final ArcToBezierCurveTransformer arcToBezierCurveTransformer;
/**
* Creates a new border painter for PostScript.
* @param generator the PostScript generator
*/
public PSGraphicsPainter(PSGenerator generator) {
this.generator = generator;
this.arcToBezierCurveTransformer = new ArcToBezierCurveTransformer(this);
}
/** {@inheritDoc} */
public void drawBorderLine(int x1, int y1, int x2, int y2, boolean horz,
boolean startOrBefore, int style, Color col) throws IOException {
drawBorderLine(generator, toPoints(x1), toPoints(y1), toPoints(x2), toPoints(y2),
horz, startOrBefore, style, col);
}
private static void drawLine(PSGenerator gen,
float startx, float starty, float endx, float endy) throws IOException {
gen.writeln(gen.formatDouble(startx) + " "
+ gen.formatDouble(starty) + " " + gen.mapCommand("moveto") + " "
+ gen.formatDouble(endx) + " "
+ gen.formatDouble(endy) + " " + gen.mapCommand("lineto") + " "
+ gen.mapCommand("stroke") + " " + gen.mapCommand("newpath"));
}
/** {@inheritDoc} */
public static void drawBorderLine(PSGenerator gen,
float x1, float y1, float x2, float y2, boolean horz,
boolean startOrBefore, int style, Color col) throws IOException {
float w = x2 - x1;
float h = y2 - y1;
if ((w < 0) || (h < 0)) {
log.error("Negative extent received. Border won't be painted.");
return;
}
switch (style) {
case Constants.EN_DASHED:
gen.useColor(col);
if (horz) {
float dashWidth = BorderPainter.dashWidthCalculator(w, h);
gen.useDash("[" + dashWidth + " " + BorderPainter.DASHED_BORDER_SPACE_RATIO
* dashWidth + "] 0");
gen.useLineCap(0);
gen.useLineWidth(h);
float ym = y1 + (h / 2);
drawLine(gen, x1, ym, x2, ym);
} else {
float dashWidth = BorderPainter.dashWidthCalculator(h, w);
gen.useDash("[" + dashWidth + " " + BorderPainter.DASHED_BORDER_SPACE_RATIO
* dashWidth + "] 0");
gen.useLineCap(0);
gen.useLineWidth(w);
float xm = x1 + (w / 2);
drawLine(gen, xm, y1, xm, y2);
}
break;
case Constants.EN_DOTTED:
gen.useColor(col);
gen.useLineCap(1); //Rounded!
if (horz) {
float unit = Math.abs(2 * h);
int rep = (int) (w / unit);
if (rep % 2 == 0) {
rep++;
}
unit = w / rep;
gen.useDash("[0 " + unit + "] 0");
gen.useLineWidth(h);
float ym = y1 + (h / 2);
drawLine(gen, x1, ym, x2, ym);
} else {
float unit = Math.abs(2 * w);
int rep = (int) (h / unit);
if (rep % 2 == 0) {
rep++;
}
unit = h / rep;
gen.useDash("[0 " + unit + "] 0");
gen.useLineWidth(w);
float xm = x1 + (w / 2);
drawLine(gen, xm, y1, xm, y2);
}
break;
case Constants.EN_DOUBLE:
gen.useColor(col);
gen.useDash(null);
if (horz) {
float h3 = h / 3;
gen.useLineWidth(h3);
float ym1 = y1 + (h3 / 2);
float ym2 = ym1 + h3 + h3;
drawLine(gen, x1, ym1, x2, ym1);
drawLine(gen, x1, ym2, x2, ym2);
} else {
float w3 = w / 3;
gen.useLineWidth(w3);
float xm1 = x1 + (w3 / 2);
float xm2 = xm1 + w3 + w3;
drawLine(gen, xm1, y1, xm1, y2);
drawLine(gen, xm2, y1, xm2, y2);
}
break;
case Constants.EN_GROOVE:
case Constants.EN_RIDGE:
float colFactor = (style == Constants.EN_GROOVE ? 0.4f : -0.4f);
gen.useDash(null);
if (horz) {
Color uppercol = ColorUtil.lightenColor(col, -colFactor);
Color lowercol = ColorUtil.lightenColor(col, colFactor);
float h3 = h / 3;
gen.useLineWidth(h3);
float ym1 = y1 + (h3 / 2);
gen.useColor(uppercol);
drawLine(gen, x1, ym1, x2, ym1);
gen.useColor(col);
drawLine(gen, x1, ym1 + h3, x2, ym1 + h3);
gen.useColor(lowercol);
drawLine(gen, x1, ym1 + h3 + h3, x2, ym1 + h3 + h3);
} else {
Color leftcol = ColorUtil.lightenColor(col, -colFactor);
Color rightcol = ColorUtil.lightenColor(col, colFactor);
float w3 = w / 3;
gen.useLineWidth(w3);
float xm1 = x1 + (w3 / 2);
gen.useColor(leftcol);
drawLine(gen, xm1, y1, xm1, y2);
gen.useColor(col);
drawLine(gen, xm1 + w3, y1, xm1 + w3, y2);
gen.useColor(rightcol);
drawLine(gen, xm1 + w3 + w3, y1, xm1 + w3 + w3, y2);
}
break;
case Constants.EN_INSET:
case Constants.EN_OUTSET:
colFactor = (style == Constants.EN_OUTSET ? 0.4f : -0.4f);
gen.useDash(null);
if (horz) {
Color c = ColorUtil.lightenColor(col, (startOrBefore ? 1 : -1) * colFactor);
gen.useLineWidth(h);
float ym1 = y1 + (h / 2);
gen.useColor(c);
drawLine(gen, x1, ym1, x2, ym1);
} else {
Color c = ColorUtil.lightenColor(col, (startOrBefore ? 1 : -1) * colFactor);
gen.useLineWidth(w);
float xm1 = x1 + (w / 2);
gen.useColor(c);
drawLine(gen, xm1, y1, xm1, y2);
}
break;
case Constants.EN_HIDDEN:
break;
default:
gen.useColor(col);
gen.useDash(null);
gen.useLineCap(0);
if (horz) {
gen.useLineWidth(h);
float ym = y1 + (h / 2);
drawLine(gen, x1, ym, x2, ym);
} else {
gen.useLineWidth(w);
float xm = x1 + (w / 2);
drawLine(gen, xm, y1, xm, y2);
}
}
}
/** {@inheritDoc} */
public void drawLine(Point start, Point end,
int width, Color color, RuleStyle style) throws IOException {
if (start.y != end.y) {
//TODO Support arbitrary lines if necessary
throw new UnsupportedOperationException(
"Can only deal with horizontal lines right now");
}
saveGraphicsState();
int half = width / 2;
int starty = start.y - half;
//Rectangle boundingRect = new Rectangle(start.x, start.y - half, end.x - start.x, width);
switch (style.getEnumValue()) {
case Constants.EN_SOLID:
case Constants.EN_DASHED:
case Constants.EN_DOUBLE:
drawBorderLine(start.x, starty, end.x, starty + width,
true, true, style.getEnumValue(), color);
break;
case Constants.EN_DOTTED:
clipRect(start.x, starty, end.x - start.x, width);
//This displaces the dots to the right by half a dot's width
//TODO There's room for improvement here
generator.concatMatrix(1, 0, 0, 1, toPoints(half), 0);
drawBorderLine(start.x, starty, end.x, starty + width,
true, true, style.getEnumValue(), color);
break;
case Constants.EN_GROOVE:
case Constants.EN_RIDGE:
generator.useColor(ColorUtil.lightenColor(color, 0.6f));
moveTo(start.x, starty);
lineTo(end.x, starty);
lineTo(end.x, starty + 2 * half);
lineTo(start.x, starty + 2 * half);
closePath();
generator.write(" " + generator.mapCommand("fill"));
generator.writeln(" " + generator.mapCommand("newpath"));
generator.useColor(color);
if (style == RuleStyle.GROOVE) {
moveTo(start.x, starty);
lineTo(end.x, starty);
lineTo(end.x, starty + half);
lineTo(start.x + half, starty + half);
lineTo(start.x, starty + 2 * half);
} else {
moveTo(end.x, starty);
lineTo(end.x, starty + 2 * half);
lineTo(start.x, starty + 2 * half);
lineTo(start.x, starty + half);
lineTo(end.x - half, starty + half);
}
closePath();
generator.write(" " + generator.mapCommand("fill"));
generator.writeln(" " + generator.mapCommand("newpath"));
break;
default:
throw new UnsupportedOperationException("rule style not supported");
}
restoreGraphicsState();
}
private static float toPoints(int mpt) {
return mpt / 1000f;
}
/** {@inheritDoc} */
public void moveTo(int x, int y) throws IOException {
generator.writeln(generator.formatDouble(toPoints(x)) + " "
+ generator.formatDouble(toPoints(y)) + " " + generator.mapCommand("moveto"));
}
/** {@inheritDoc} */
public void lineTo(int x, int y) throws IOException {
generator.writeln(generator.formatDouble(toPoints(x)) + " "
+ generator.formatDouble(toPoints(y)) + " " + generator.mapCommand("lineto"));
}
/** {@inheritDoc} */
public void arcTo(final double startAngle, final double endAngle, final int cx, final int cy,
final int width, final int height) throws IOException {
arcToBezierCurveTransformer.arcTo(startAngle, endAngle, cx, cy, width, height);
}
/** {@inheritDoc} */
public void closePath() throws IOException {
generator.writeln("cp");
}
private void clipRect(int x, int y, int width, int height) throws IOException {
generator.defineRect(toPoints(x), toPoints(y), toPoints(width), toPoints(height));
clip();
}
/** {@inheritDoc} */
public void clip() throws IOException {
generator.writeln(generator.mapCommand("clip") + " " + generator.mapCommand("newpath"));
}
/** {@inheritDoc} */
public void saveGraphicsState() throws IOException {
generator.saveGraphicsState();
}
/** {@inheritDoc} */
public void restoreGraphicsState() throws IOException {
generator.restoreGraphicsState();
}
/** {@inheritDoc} */
public void rotateCoordinates(double angle) throws IOException {
StringBuffer sb = new StringBuffer()
.append(generator.formatDouble(angle * 180d / Math.PI))
.append(" rotate ");
generator.writeln(sb.toString());
}
/** {@inheritDoc} */
public void translateCoordinates(int xTranslate, int yTranslate) throws IOException {
StringBuffer sb = new StringBuffer()
.append(generator.formatDouble(toPoints(xTranslate)))
.append(" ")
.append(generator.formatDouble(toPoints(yTranslate)))
.append(" translate ");
generator.writeln(sb.toString());
}
/** {@inheritDoc} */
public void scaleCoordinates(float xScale, float yScale) throws IOException {
StringBuffer sb = new StringBuffer()
.append(generator.formatDouble(xScale))
.append(" ")
.append(generator.formatDouble(yScale))
.append(" scale ");
generator.writeln(sb.toString());
}
/** {@inheritDoc} */
public void cubicBezierTo(int p1x, int p1y, int p2x, int p2y, int p3x, int p3y)
throws IOException {
StringBuffer sb = new StringBuffer()
.append(generator.formatDouble(toPoints(p1x)))
.append(" ")
.append(generator.formatDouble(toPoints(p1y)))
.append(" ")
.append(generator.formatDouble(toPoints(p2x)))
.append(" ")
.append(generator.formatDouble(toPoints(p2y)))
.append(" ")
.append(generator.formatDouble(toPoints(p3x)))
.append(" ")
.append(generator.formatDouble(toPoints(p3y)))
.append(" curveto ");
generator.writeln(sb.toString());
}
}