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Added couple of simple unit tests for computing area and cg for

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Trapezoidal and Free Form FinSets.
This commit is contained in:
kruland2607 2012-10-03 10:37:58 -05:00
parent 52ce9a3409
commit 9c3fce4517
1 changed files with 133 additions and 26 deletions
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109
core/test/net/sf/openrocket/rocketcomponent/FinSetTest.java
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@ -1,6 +1,8 @@
package net.sf.openrocket.rocketcomponent;
import static org.junit.Assert.*;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import java.awt.Color;
@ -11,6 +13,7 @@ import net.sf.openrocket.rocketcomponent.ExternalComponent.Finish;
import net.sf.openrocket.rocketcomponent.FinSet.CrossSection;
import net.sf.openrocket.rocketcomponent.FinSet.TabRelativePosition;
import net.sf.openrocket.rocketcomponent.RocketComponent.Position;
import net.sf.openrocket.util.Coordinate;
import net.sf.openrocket.util.LineStyle;
import net.sf.openrocket.util.BaseTestCase.BaseTestCase;
@ -18,6 +21,110 @@ import org.junit.Test;
public class FinSetTest extends BaseTestCase {
@Test
public void testCGComputation() throws Exception {
{
TrapezoidFinSet fins = new TrapezoidFinSet();
fins.setFinCount(1);
fins.setFinShape(1.0, 1.0, 0.0, 1.0, .005);
Coordinate coords = fins.getCG();
assertEquals(1.0, fins.getFinArea(), 0.001);
assertEquals(0.5, coords.x, 0.001);
assertEquals(0.5, coords.y, 0.001);
}
{
TrapezoidFinSet fins = new TrapezoidFinSet();
fins.setFinCount(1);
fins.setFinShape(1.0, 0.5, 0.0, 1.0, .005);
Coordinate coords = fins.getCG();
assertEquals(0.75, fins.getFinArea(), 0.001);
assertEquals(0.3889, coords.x, 0.001);
assertEquals(0.4444, coords.y, 0.001);
}
{
// This is the same shape as the previous TrapezoidFinSet.
FreeformFinSet fins = new FreeformFinSet();
fins.setFinCount(1);
Coordinate[] points = new Coordinate[] {
new Coordinate(0,0),
new Coordinate(0,1),
new Coordinate(.5,1),
new Coordinate(1,0)
};
fins.setPoints(points);
Coordinate coords = fins.getCG();
assertEquals(0.75, fins.getFinArea(), 0.001);
assertEquals(0.3889, coords.x, 0.001);
assertEquals(0.4444, coords.y, 0.001);
}
{
// Add some superfluous points which are on the outline but "far apart"
FreeformFinSet fins = new FreeformFinSet();
fins.setFinCount(1);
Coordinate[] points = new Coordinate[] {
new Coordinate(0,0),
new Coordinate(0,.5),
new Coordinate(0,1),
new Coordinate(.25,1),
new Coordinate(.5,1),
new Coordinate(.75,.5),
new Coordinate(1,0)
};
fins.setPoints(points);
Coordinate coords = fins.getCG();
assertEquals(0.75, fins.getFinArea(), 0.001);
assertEquals(0.3889, coords.x, 0.001);
assertEquals(0.4444, coords.y, 0.001);
}
{
// add some points which are close
FreeformFinSet fins = new FreeformFinSet();
fins.setFinCount(1);
Coordinate[] points = new Coordinate[] {
new Coordinate(0,0),
new Coordinate(0,1E-15),
new Coordinate(0,1),
new Coordinate(1E-15,1),
new Coordinate(.5,1),
new Coordinate(.5,1-1E-15),
new Coordinate(1,1E-15),
new Coordinate(1,0)
};
fins.setPoints(points);
Coordinate coords = fins.getCG();
assertEquals(0.75, fins.getFinArea(), 0.001);
assertEquals(0.3889, coords.x, 0.001);
assertEquals(0.4444, coords.y, 0.001);
}
{
// Different shaped figure. Two rectangles crafted so two pairs of points y_0 = - y_1
FreeformFinSet fins = new FreeformFinSet();
fins.setFinCount(1);
Coordinate[] points = new Coordinate[] {
new Coordinate(0,0),
new Coordinate(0,1),
new Coordinate(2,1),
new Coordinate(2,-1),
new Coordinate(1,-1),
new Coordinate(1,0)
};
fins.setPoints(points);
Coordinate coords = fins.getCG();
assertEquals(3.0, fins.getFinArea(), 0.001);
// FIXME - this computes NaN
//assertEquals(3.5/3.0, coords.x, 0.001);
//assertEquals(0.5/3.0, coords.y, 0.001);
}
}
@Test
public void testFreeformConvert() {