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Merge pull request #5 from kruland2607/bugfixes-1

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Bugfixes 1
This commit is contained in:
plaa 2012-10-08 11:58:50 -07:00
commit 78e3931c9e
4 changed files with 180 additions and 31 deletions
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2
core/src/net/sf/openrocket/file/openrocket/importt/OpenRocketLoader.java
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@ -1494,7 +1494,7 @@ class SimulationConditionsHandler extends AbstractElementHandler {
} else if (element.equals("atmosphere")) {
atmosphereHandler.storeSettings(conditions, warnings);
} else if (element.equals("timestep")) {
if (Double.isNaN(d)) {
if (Double.isNaN(d) || d <= 0 ) {
warnings.add("Illegal time step defined, ignoring.");
} else {
conditions.setTimeStep(d);

2
core/src/net/sf/openrocket/rocketcomponent/FinSet.java
View File

@ -440,7 +440,7 @@ public abstract class FinSet extends ExternalComponent {
double da = (y0 + y1) * (x1 - x0) / 2;
finArea += da;
if (Math.abs(y0 - y1) < 0.00001) {
if (Math.abs(y0 + y1) < 0.00001) {
finCGx += (x0 + x1) / 2 * da;
finCGy += y0 / 2 * da;
} else {

3
core/src/net/sf/openrocket/simulation/RK4SimulationStepper.java
View File

@ -139,7 +139,8 @@ public class RK4SimulationStepper extends AbstractSimulationStepper {
double[] dt = new double[8];
Arrays.fill(dt, Double.MAX_VALUE);
dt[0] = status.getSimulationConditions().getTimeStep();
// If the user selected a really small timestep, use MIN_TIME_STEP instead.
dt[0] = MathUtil.max(status.getSimulationConditions().getTimeStep(),MIN_TIME_STEP);
dt[1] = maxTimeStep;
dt[2] = status.getSimulationConditions().getMaximumAngleStep() / store.lateralPitchRate;
dt[3] = Math.abs(MAX_ROLL_STEP_ANGLE / store.flightConditions.getRollRate());

150
core/test/net/sf/openrocket/rocketcomponent/FinSetTest.java
View File

@ -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 +21,151 @@ import org.junit.Test;
public class FinSetTest extends BaseTestCase {
@Test
public void testTrapezoidCGComputation() {
{
// This is a simple square fin with sides of 1.0.
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);
}
{
// This is a trapezoid. Height 1, root 1, tip 1/2 no sweep.
// It can be decomposed into a rectangle followed by a triangle
// +---+
// | \
// | \
// +------+
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);
}
}
@Test
public void testFreeformCGComputation() throws Exception {
{
// This is a trapezoid. Height 1, root 1, tip 1/2 no sweep.
// It can be decomposed into a rectangle followed by a triangle
// +---+
// | \
// | \
// +------+
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);
}
{
// This is the same trapezoid as previous free form, but it has
// some extra points along the lines.
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);
}
{
// This is the same trapezoid as previous free form, but it has
// some extra points which are very close to previous points.
// in particular for points 0 & 1,
// y0 + y1 is very small.
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);
}
}
@Test
public void testFreeFormCGWithNegativeY() throws Exception {
// This particular fin shape is currently not allowed in OR since the y values are negative
// however, it is possible to convert RockSim files and end up with fins which
// have negative y values.
// A user submitted an ork file which could not be simulated because the fin
// was constructed on a tail cone. It so happened that for one pair of points
// y_n = - y_(n+1) which caused a divide by zero and resulted in CGx = NaN.
// This Fin set is constructed to have the same problem. It is a square and rectagle
// where the two trailing edge corners of the rectangle satisfy 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);
assertEquals(3.5/3.0, coords.x, 0.001);
assertEquals(0.5/3.0, coords.y, 0.001);
}
@Test
public void testFreeformConvert() {