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Add line clipping algorithms (#5580)
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package com.thealgorithms.lineclipping;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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import static org.junit.jupiter.api.Assertions.assertNotNull;
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import static org.junit.jupiter.api.Assertions.assertNull;
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import com.thealgorithms.lineclipping.utils.Line;
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import com.thealgorithms.lineclipping.utils.Point;
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import org.junit.jupiter.api.Test;
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/**
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* @author shikarisohan
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* @since 10/4/24
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*/
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class CohenSutherlandTest {
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// Define the clipping window (1.0, 1.0) to (10.0, 10.0)
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CohenSutherland cs = new CohenSutherland(1.0, 1.0, 10.0, 10.0);
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@Test
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void testLineCompletelyInside() {
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// Line fully inside the clipping window
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Line line = new Line(new Point(2.0, 2.0), new Point(8.0, 8.0));
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Line clippedLine = cs.cohenSutherlandClip(line);
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assertNotNull(clippedLine, "Line should not be null.");
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assertEquals(line, clippedLine, "Line inside the window should remain unchanged.");
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}
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@Test
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void testLineCompletelyOutside() {
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// Line completely outside and above the clipping window
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Line line = new Line(new Point(11.0, 12.0), new Point(15.0, 18.0));
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Line clippedLine = cs.cohenSutherlandClip(line);
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assertNull(clippedLine, "Line should be null because it's completely outside.");
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}
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@Test
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void testLinePartiallyInside() {
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// Line partially inside the clipping window
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Line line = new Line(new Point(5.0, 5.0), new Point(12.0, 12.0));
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Line expectedClippedLine = new Line(new Point(5.0, 5.0), new Point(10.0, 10.0)); // Clipped at (10, 10)
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Line clippedLine = cs.cohenSutherlandClip(line);
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assertNotNull(clippedLine, "Line should not be null.");
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assertEquals(expectedClippedLine, clippedLine, "Line should be clipped correctly.");
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}
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@Test
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void testLineOnBoundary() {
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// Line exactly on the boundary of the clipping window
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Line line = new Line(new Point(1.0, 5.0), new Point(10.0, 5.0));
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Line clippedLine = cs.cohenSutherlandClip(line);
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assertNotNull(clippedLine, "Line should not be null.");
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assertEquals(line, clippedLine, "Line on the boundary should remain unchanged.");
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}
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@Test
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void testDiagonalLineThroughClippingWindow() {
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// Diagonal line crossing from outside to outside through the window
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Line line = new Line(new Point(0.0, 0.0), new Point(12.0, 12.0));
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Line expectedClippedLine = new Line(new Point(1.0, 1.0), new Point(10.0, 10.0)); // Clipped at both boundaries
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Line clippedLine = cs.cohenSutherlandClip(line);
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assertNotNull(clippedLine, "Line should not be null.");
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assertEquals(expectedClippedLine, clippedLine, "Diagonal line should be clipped correctly.");
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}
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@Test
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void testVerticalLineClipping() {
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// Vertical line crossing the top and bottom of the clipping window
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Line line = new Line(new Point(5.0, 0.0), new Point(5.0, 12.0));
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Line expectedClippedLine = new Line(new Point(5.0, 1.0), new Point(5.0, 10.0)); // Clipped at yMin and yMax
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Line clippedLine = cs.cohenSutherlandClip(line);
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assertNotNull(clippedLine, "Line should not be null.");
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assertEquals(expectedClippedLine, clippedLine, "Vertical line should be clipped correctly.");
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}
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}
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@ -0,0 +1,65 @@
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package com.thealgorithms.lineclipping;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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import static org.junit.jupiter.api.Assertions.assertNotNull;
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import static org.junit.jupiter.api.Assertions.assertNull;
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import com.thealgorithms.lineclipping.utils.Line;
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import com.thealgorithms.lineclipping.utils.Point;
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import org.junit.jupiter.api.Test;
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/**
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* @author shikarisohan
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* @since 10/5/24
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*/
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class LiangBarskyTest {
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LiangBarsky lb = new LiangBarsky(1.0, 1.0, 10.0, 10.0);
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@Test
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void testLineCompletelyInside() {
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Line line = new Line(new Point(2.0, 2.0), new Point(8.0, 8.0));
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Line clippedLine = lb.liangBarskyClip(line);
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assertNotNull(clippedLine, "Line should not be null.");
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assertEquals(line, clippedLine, "Line inside the window should remain unchanged.");
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}
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@Test
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void testLineCompletelyOutside() {
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Line line = new Line(new Point(12.0, 12.0), new Point(15.0, 18.0));
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Line clippedLine = lb.liangBarskyClip(line);
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assertNull(clippedLine, "Line should be null because it's completely outside.");
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}
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@Test
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void testLinePartiallyInside() {
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Line line = new Line(new Point(5.0, 5.0), new Point(12.0, 12.0));
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Line expectedClippedLine = new Line(new Point(5.0, 5.0), new Point(10.0, 10.0)); // Clipped at (10, 10)
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Line clippedLine = lb.liangBarskyClip(line);
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assertNotNull(clippedLine, "Line should not be null.");
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assertEquals(expectedClippedLine, clippedLine, "Line should be clipped correctly.");
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}
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@Test
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void testDiagonalLineThroughClippingWindow() {
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Line line = new Line(new Point(0.0, 0.0), new Point(12.0, 12.0));
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Line expectedClippedLine = new Line(new Point(1.0, 1.0), new Point(10.0, 10.0)); // Clipped at both boundaries
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Line clippedLine = lb.liangBarskyClip(line);
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assertNotNull(clippedLine, "Line should not be null.");
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assertEquals(expectedClippedLine, clippedLine, "Diagonal line should be clipped correctly.");
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}
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@Test
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void testVerticalLineClipping() {
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Line line = new Line(new Point(5.0, 0.0), new Point(5.0, 12.0));
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Line expectedClippedLine = new Line(new Point(5.0, 1.0), new Point(5.0, 10.0)); // Clipped at yMin and yMax
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Line clippedLine = lb.liangBarskyClip(line);
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assertNotNull(clippedLine, "Line should not be null.");
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assertEquals(expectedClippedLine, clippedLine, "Vertical line should be clipped correctly.");
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}
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}
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