Java tutorial
/* * 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.java2d; import java.awt.BasicStroke; import java.awt.Color; import java.awt.Graphics2D; import java.awt.Point; import java.awt.Rectangle; import java.awt.geom.GeneralPath; import java.awt.geom.Line2D; import java.io.IOException; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.apache.fop.fo.Constants; import org.apache.fop.render.intermediate.GraphicsPainter; import org.apache.fop.traits.RuleStyle; import org.apache.fop.util.ColorUtil; class Java2DGraphicsPainter implements GraphicsPainter { /** logging instance */ static final Log log = LogFactory.getLog(Java2DGraphicsPainter.class); private GeneralPath currentPath; private final Java2DPainter painter; Java2DGraphicsPainter(Java2DPainter painter) { this.painter = painter; } private Java2DGraphicsState getG2DState() { return this.painter.g2dState; } private Graphics2D getG2D() { return getG2DState().getGraph(); } public void drawBorderLine(int x1, int y1, int x2, int y2, boolean horz, boolean startOrBefore, int style, Color color) 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: getG2D().setColor(color); if (horz) { float unit = Math.abs(2 * h); int rep = (int) (w / unit); if (rep % 2 == 0) { rep++; } unit = w / rep; float ym = y1 + (h / 2); BasicStroke s = new BasicStroke(h, BasicStroke.CAP_BUTT, BasicStroke.JOIN_MITER, 10.0f, new float[] { unit }, 0); getG2D().setStroke(s); getG2D().draw(new Line2D.Float(x1, ym, x2, ym)); } else { float unit = Math.abs(2 * w); int rep = (int) (h / unit); if (rep % 2 == 0) { rep++; } unit = h / rep; float xm = x1 + (w / 2); BasicStroke s = new BasicStroke(w, BasicStroke.CAP_BUTT, BasicStroke.JOIN_MITER, 10.0f, new float[] { unit }, 0); getG2D().setStroke(s); getG2D().draw(new Line2D.Float(xm, y1, xm, y2)); } break; case Constants.EN_DOTTED: getG2D().setColor(color); if (horz) { float unit = Math.abs(2 * h); int rep = (int) (w / unit); if (rep % 2 == 0) { rep++; } unit = w / rep; float ym = y1 + (h / 2); BasicStroke s = new BasicStroke(h, BasicStroke.CAP_ROUND, BasicStroke.JOIN_MITER, 10.0f, new float[] { 0, unit }, 0); getG2D().setStroke(s); getG2D().draw(new Line2D.Float(x1, ym, x2, ym)); } else { float unit = Math.abs(2 * w); int rep = (int) (h / unit); if (rep % 2 == 0) { rep++; } unit = h / rep; float xm = x1 + (w / 2); BasicStroke s = new BasicStroke(w, BasicStroke.CAP_ROUND, BasicStroke.JOIN_MITER, 10.0f, new float[] { 0, unit }, 0); getG2D().setStroke(s); getG2D().draw(new Line2D.Float(xm, y1, xm, y2)); } break; case Constants.EN_DOUBLE: getG2D().setColor(color); if (horz) { float h3 = h / 3; float ym1 = y1 + (h3 / 2); float ym2 = ym1 + h3 + h3; BasicStroke s = new BasicStroke(h3); getG2D().setStroke(s); getG2D().draw(new Line2D.Float(x1, ym1, x2, ym1)); getG2D().draw(new Line2D.Float(x1, ym2, x2, ym2)); } else { float w3 = w / 3; float xm1 = x1 + (w3 / 2); float xm2 = xm1 + w3 + w3; BasicStroke s = new BasicStroke(w3); getG2D().setStroke(s); getG2D().draw(new Line2D.Float(xm1, y1, xm1, y2)); getG2D().draw(new Line2D.Float(xm2, y1, xm2, y2)); } break; case Constants.EN_GROOVE: case Constants.EN_RIDGE: float colFactor = (style == Constants.EN_GROOVE ? 0.4f : -0.4f); if (horz) { Color uppercol = ColorUtil.lightenColor(color, -colFactor); Color lowercol = ColorUtil.lightenColor(color, colFactor); float h3 = h / 3; float ym1 = y1 + (h3 / 2); getG2D().setStroke(new BasicStroke(h3)); getG2D().setColor(uppercol); getG2D().draw(new Line2D.Float(x1, ym1, x2, ym1)); getG2D().setColor(color); getG2D().draw(new Line2D.Float(x1, ym1 + h3, x2, ym1 + h3)); getG2D().setColor(lowercol); getG2D().draw(new Line2D.Float(x1, ym1 + h3 + h3, x2, ym1 + h3 + h3)); } else { Color leftcol = ColorUtil.lightenColor(color, -colFactor); Color rightcol = ColorUtil.lightenColor(color, colFactor); float w3 = w / 3; float xm1 = x1 + (w3 / 2); getG2D().setStroke(new BasicStroke(w3)); getG2D().setColor(leftcol); getG2D().draw(new Line2D.Float(xm1, y1, xm1, y2)); getG2D().setColor(color); getG2D().draw(new Line2D.Float(xm1 + w3, y1, xm1 + w3, y2)); getG2D().setColor(rightcol); getG2D().draw(new Line2D.Float(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); if (horz) { color = ColorUtil.lightenColor(color, (startOrBefore ? 1 : -1) * colFactor); getG2D().setStroke(new BasicStroke(h)); float ym1 = y1 + (h / 2); getG2D().setColor(color); getG2D().draw(new Line2D.Float(x1, ym1, x2, ym1)); } else { color = ColorUtil.lightenColor(color, (startOrBefore ? 1 : -1) * colFactor); float xm1 = x1 + (w / 2); getG2D().setStroke(new BasicStroke(w)); getG2D().setColor(color); getG2D().draw(new Line2D.Float(xm1, y1, xm1, y2)); } break; case Constants.EN_HIDDEN: break; default: getG2D().setColor(color); if (horz) { float ym = y1 + (h / 2); getG2D().setStroke(new BasicStroke(h)); getG2D().draw(new Line2D.Float(x1, ym, x2, ym)); } else { float xm = x1 + (w / 2); getG2D().setStroke(new BasicStroke(w)); getG2D().draw(new Line2D.Float(xm, y1, xm, y2)); } } } 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); getG2DState().updateClip(boundingRect); switch (style.getEnumValue()) { case Constants.EN_SOLID: case Constants.EN_DASHED: case Constants.EN_DOUBLE: drawBorderLine(start.x, start.y - half, end.x, end.y + half, true, true, style.getEnumValue(), color); break; case Constants.EN_DOTTED: int shift = half; //This shifts the dots to the right by half a dot's width drawBorderLine(start.x + shift, start.y - half, end.x + shift, end.y + half, true, true, style.getEnumValue(), color); break; case Constants.EN_GROOVE: case Constants.EN_RIDGE: getG2DState().updateColor(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(); getG2D().fill(currentPath); currentPath = null; getG2DState().updateColor(color); if (style.getEnumValue() == Constants.EN_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(); getG2D().fill(currentPath); currentPath = null; break; case Constants.EN_NONE: // No rule is drawn break; default: break; } // end switch restoreGraphicsState(); } /** {@inheritDoc} */ public void moveTo(int x, int y) throws IOException { if (currentPath == null) { currentPath = new GeneralPath(); } currentPath.moveTo(x, y); } /** {@inheritDoc} */ public void lineTo(int x, int y) throws IOException { if (currentPath == null) { currentPath = new GeneralPath(); } currentPath.lineTo(x, y); } /** {@inheritDoc} */ public void arcTo(double startAngle, double endAngle, int cx, int cy, int width, int height) throws IOException { } /** {@inheritDoc} */ public void rotateCoordinates(double angle) throws IOException { } /** {@inheritDoc} */ public void translateCoordinates(int xTranslate, int yTranslate) throws IOException { } /** {@inheritDoc} */ public void scaleCoordinates(float xScale, float yScale) throws IOException { } /** {@inheritDoc} */ public void closePath() throws IOException { currentPath.closePath(); } /** {@inheritDoc} */ public void clip() throws IOException { if (currentPath == null) { throw new IllegalStateException("No current path available!"); } getG2DState().updateClip(currentPath); currentPath = null; } /** {@inheritDoc} */ public void saveGraphicsState() throws IOException { this.painter.saveGraphicsState(); } /** {@inheritDoc} */ public void restoreGraphicsState() throws IOException { this.painter.restoreGraphicsState(); this.currentPath = null; } }