114 lines
4.2 KiB
Java
114 lines
4.2 KiB
Java
/*
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* Copyright (c) 2022, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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@test
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@bug 8165943
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@summary LineBreakMeasurer does not measure correctly if TextAttribute.TRACKING is set
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@run main/othervm LineBreakWithTrackingAuto
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*/
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import java.awt.font.FontRenderContext;
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import java.awt.font.LineBreakMeasurer;
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import java.awt.font.TextAttribute;
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import java.awt.font.TextLayout;
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import java.text.AttributedString;
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public class LineBreakWithTrackingAuto {
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private static final String WORD = "word";
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private static final String SPACE = " ";
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private static final int NUM_WORDS = 12;
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private static final float FONT_SIZE = 24.0f;
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private static final float TEXT_TRACKING[] = { -0.1f, 0f, 0.1f, 0.2f, 0.3f };
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private static final float EPSILON = 0.005f;
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public static void main(String[] args) {
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new LineBreakWithTrackingAuto().test();
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}
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public void test() {
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final FontRenderContext frc = new FontRenderContext(null, false, false);
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// construct a paragraph as follows: [SPACE + WORD] + ...
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StringBuffer text = new StringBuffer();
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for (int i = 0; i < NUM_WORDS; i++) {
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text.append(SPACE);
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text.append(WORD);
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}
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AttributedString attrString = new AttributedString(text.toString());
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attrString.addAttribute(TextAttribute.SIZE, Float.valueOf(FONT_SIZE));
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// test different tracking values: -0.1f, 0f, 0.1f, 0.2f, 0.3f
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for (float textTracking : TEXT_TRACKING) {
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final float trackingAdvance = FONT_SIZE * textTracking;
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attrString.addAttribute(TextAttribute.TRACKING, textTracking);
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LineBreakMeasurer measurer = new LineBreakMeasurer(attrString.getIterator(), frc);
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final int sequenceLength = WORD.length() + SPACE.length();
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final float sequenceAdvance = getSequenceAdvance(measurer, text.length(), sequenceLength);
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final float textAdvance = NUM_WORDS * sequenceAdvance;
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// test different wrapping width starting from the WORD+SPACE to TEXT width
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for (float wrappingWidth = sequenceAdvance; wrappingWidth < textAdvance; wrappingWidth += sequenceAdvance / sequenceLength) {
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measurer.setPosition(0);
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// break a paragraph into lines that fit the given wrapping width
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do {
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TextLayout layout = measurer.nextLayout(wrappingWidth);
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float visAdvance = layout.getVisibleAdvance();
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int currPos = measurer.getPosition();
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if ((trackingAdvance <= 0 && visAdvance - wrappingWidth > EPSILON)
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|| (trackingAdvance > 0 && visAdvance - wrappingWidth > trackingAdvance + EPSILON)) {
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throw new Error("text line is too long for given wrapping width");
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}
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if (currPos < text.length() && visAdvance <= wrappingWidth - sequenceAdvance) {
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throw new Error("text line is too short for given wrapping width");
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}
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} while (measurer.getPosition() != text.length());
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}
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}
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}
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private float getSequenceAdvance(LineBreakMeasurer measurer, int textLength, int sequenceLength) {
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measurer.setPosition(textLength - sequenceLength);
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TextLayout layout = measurer.nextLayout(10000.0f);
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if (layout.getCharacterCount() != sequenceLength) {
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throw new Error("layout length is incorrect");
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}
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return layout.getVisibleAdvance();
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}
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}
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