Java tutorial
/* * Copyright (C) 2009 Camptocamp * * This file is part of MapFish Server * * MapFish Server is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * MapFish Server 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 Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with MapFish Server. If not, see <http://www.gnu.org/licenses/>. */ package org.mapfish.print.scalebar; import com.lowagie.text.Font; import com.lowagie.text.Rectangle; import com.lowagie.text.pdf.PdfContentByte; import org.mapfish.print.ChunkDrawer; import org.mapfish.print.PDFCustomBlocks; import org.mapfish.print.config.layout.ScalebarBlock; import java.awt.geom.AffineTransform; import java.util.List; /** * Base class for drawing a scale bar. */ public abstract class ScalebarDrawer extends ChunkDrawer { protected final ScalebarBlock block; protected final List<Label> labels; protected final int barSize; private final int labelDistance; protected final int subIntervals; protected final float intervalWidth; private final Font pdfFont; private final float leftLabelMargin; private final float rightLabelMargin; private final float maxLabelWidth; private final float maxLabelHeight; public ScalebarDrawer(PDFCustomBlocks customBlocks, ScalebarBlock block, List<Label> labels, int barSize, int labelDistance, int subIntervals, float intervalWidth, Font pdfFont, float leftLabelMargin, float rightLabelMargin, float maxLabelWidth, float maxLabelHeight) { super(customBlocks); this.block = block; this.labels = labels; this.barSize = barSize; this.labelDistance = labelDistance; this.subIntervals = subIntervals; this.intervalWidth = intervalWidth; this.pdfFont = pdfFont; this.leftLabelMargin = leftLabelMargin; this.rightLabelMargin = rightLabelMargin; this.maxLabelWidth = maxLabelWidth; this.maxLabelHeight = maxLabelHeight; } public static ScalebarDrawer create(PDFCustomBlocks customBlocks, ScalebarBlock block, Type type, List<Label> labels, int barSize, int labelDistance, int subIntervals, float intervalWidth, Font pdfFont, float leftLabelMargin, float rightLabelMargin, float maxLabelWidth, float maxLabelHeight) { switch (type) { case BAR: return new BarScalebarDrawer(customBlocks, block, labels, barSize, labelDistance, subIntervals, intervalWidth, pdfFont, leftLabelMargin, rightLabelMargin, maxLabelWidth, maxLabelHeight); case BAR_SUB: return new BarSubScalebarDrawer(customBlocks, block, labels, barSize, labelDistance, subIntervals, intervalWidth, pdfFont, leftLabelMargin, rightLabelMargin, maxLabelWidth, maxLabelHeight); case LINE: return new LineScalebarDrawer(customBlocks, block, labels, barSize, labelDistance, subIntervals, intervalWidth, pdfFont, leftLabelMargin, rightLabelMargin, maxLabelWidth, maxLabelHeight); default: throw new RuntimeException("Unknown type: " + type); } } public void renderImpl(Rectangle rectangle, PdfContentByte dc) { dc.saveState(); try { //sets the transformation for drawing the labels and do it final AffineTransform rotate = getRotationTransform(block.getBarDirection()); final AffineTransform labelTransform = AffineTransform.getTranslateInstance(rectangle.getLeft(), rectangle.getBottom()); labelTransform.concatenate(rotate); labelTransform.translate(leftLabelMargin, maxLabelHeight); dc.transform(labelTransform); dc.setColorStroke(block.getColorVal()); dc.setFontAndSize(pdfFont.getCalculatedBaseFont(false), pdfFont.getSize()); drawLabels(dc); dc.restoreState(); dc.saveState(); //sets the transformation for drawing the bar and do it final AffineTransform lineTransform = AffineTransform.getTranslateInstance(rectangle.getLeft(), rectangle.getBottom()); lineTransform.concatenate(rotate); lineTransform.translate(leftLabelMargin, labelDistance + maxLabelHeight); dc.transform(lineTransform); dc.setLineWidth((float) block.getLineWidth()); dc.setColorStroke(block.getColorVal()); drawBar(dc); } finally { dc.restoreState(); } } private AffineTransform getRotationTransform(Direction direction) { AffineTransform rotate; switch (direction) { case UP: rotate = new AffineTransform(1, 0, 0, 1, 0, 0); break; case DOWN: rotate = new AffineTransform(-1, 0, 0, -1, getTotalWidth(), getTotalHeight()); break; case LEFT: rotate = new AffineTransform(0, 1, -1, 0, getTotalHeight(), 0); break; case RIGHT: rotate = new AffineTransform(0, -1, 1, 0, 0, getTotalWidth()); break; default: throw new RuntimeException("Unknown orientation: " + direction); } return rotate; } private float getTotalWidth() { return intervalWidth * block.getIntervals() + leftLabelMargin + rightLabelMargin; } private float getTotalHeight() { return barSize + labelDistance + maxLabelHeight; } /** * Draws the labels. The transformation is setup in a manner where the * position of the labels is at (label.paperOffset,0). */ private void drawLabels(PdfContentByte dc) { float prevPos = getTotalWidth(); for (int i = labels.size() - 1; i >= 0; --i) { Label label = labels.get(i); final float offsetH; final float offsetV; if (block.getTextDirection().getAngle() == block.getBarDirection().getAngle()) { //same direction offsetH = -label.width / 2; offsetV = -maxLabelHeight; } else if (block.getTextDirection().getAngle() == -block.getBarDirection().getAngle()) { //opposite direction offsetH = label.width / 2; offsetV = 0; } else if (block.getTextDirection().getAngle() - block.getBarDirection().getAngle() < 0) { offsetH = label.width / 2; offsetV = -label.height; } else { offsetH = -label.width / 2; offsetV = 0; } if (label.paperOffset + Math.abs(offsetH) <= prevPos - 1) { dc.beginText(); dc.showTextAligned(PdfContentByte.ALIGN_LEFT, label.label, label.paperOffset + offsetH, offsetV, (float) (block.getBarDirection().getAngle() - block.getTextDirection().getAngle())); dc.endText(); prevPos = label.paperOffset - Math.abs(offsetH); } else { //the label would be written over the previous one => ignore it label.label = null; } } } /** * Draws the bar itself. The transformation is setup in a manner where the * bar starts at (0,0) and ends at (intervals*intervalWidth, lineWidth) */ protected abstract void drawBar(PdfContentByte dc); }