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Add contour angle to contours report
Angle is from minAreaRect, and is in the range [-90, 0) Rework contours operations to be a bit more functional Make filter contours a bit more optimized
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,44 @@ | ||
| package edu.wpi.grip.core.util; | ||
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| import java.util.Objects; | ||
| import java.util.function.Supplier; | ||
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| /** | ||
| * A holder for data that gets lazily initialized. | ||
| * | ||
| * @param <T> the type of held data | ||
| */ | ||
| public class LazyInit<T> { | ||
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| private T value = null; | ||
| private final Supplier<? extends T> factory; | ||
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| /** | ||
| * Creates a new lazily initialized data holder. | ||
| * | ||
| * @param factory the factory to use to create the held value | ||
| */ | ||
| public LazyInit(Supplier<? extends T> factory) { | ||
| this.factory = Objects.requireNonNull(factory, "factory"); | ||
| } | ||
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| /** | ||
| * Gets the value, initializing it if it has not yet been created. | ||
| * | ||
| * @return the held value | ||
| */ | ||
| public T get() { | ||
| if (value == null) { | ||
| value = factory.get(); | ||
| } | ||
| return value; | ||
| } | ||
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| /** | ||
| * Clears the held value. The next call to {@link #get()} will re-instantiate the held value. | ||
| */ | ||
| public void clear() { | ||
| value = null; | ||
| } | ||
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| } |
26 changes: 26 additions & 0 deletions
26
core/src/main/java/edu/wpi/grip/core/util/PointerStream.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,26 @@ | ||
| package edu.wpi.grip.core.util; | ||
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| import java.util.stream.LongStream; | ||
| import java.util.stream.Stream; | ||
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| import static org.bytedeco.javacpp.opencv_core.Mat; | ||
| import static org.bytedeco.javacpp.opencv_core.MatVector; | ||
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| /** | ||
| * Utility class for streaming native vector wrappers like {@code MatVector} | ||
| * ({@code std::vector<T>}) with the Java {@link Stream} API. | ||
| */ | ||
| public final class PointerStream { | ||
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| /** | ||
| * Creates a stream of {@code Mat} objects in a {@code MatVector}. | ||
| * | ||
| * @param vector the vector of {@code Mats} to stream | ||
| * | ||
| * @return a new stream object for the contents of the vector | ||
| */ | ||
| public static Stream<Mat> ofMatVector(MatVector vector) { | ||
| return LongStream.range(0, vector.size()) | ||
| .mapToObj(vector::get); | ||
| } | ||
| } |
45 changes: 45 additions & 0 deletions
45
core/src/test/java/edu/wpi/grip/core/util/LazyInitTest.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,45 @@ | ||
| package edu.wpi.grip.core.util; | ||
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| import org.junit.Test; | ||
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| import java.util.function.Supplier; | ||
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| import static org.junit.Assert.assertEquals; | ||
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| public class LazyInitTest { | ||
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| @Test | ||
| public void testFactoryIsOnlyCalledOnce() { | ||
| final String output = "foo"; | ||
| final int[] count = {0}; | ||
| final Supplier<String> factory = () -> { | ||
| count[0]++; | ||
| return output; | ||
| }; | ||
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| LazyInit<String> lazyInit = new LazyInit<>(factory); | ||
| lazyInit.get(); | ||
| assertEquals(1, count[0]); | ||
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| lazyInit.get(); | ||
| assertEquals("Calling get() more than once should only call the factory once", 1, count[0]); | ||
| } | ||
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| @Test | ||
| public void testClear() { | ||
| final String output = "foo"; | ||
| final int[] count = {0}; | ||
| final Supplier<String> factory = () -> { | ||
| count[0]++; | ||
| return output; | ||
| }; | ||
| LazyInit<String> lazyInit = new LazyInit<>(factory); | ||
| lazyInit.get(); | ||
| assertEquals(1, count[0]); | ||
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| lazyInit.clear(); | ||
| lazyInit.get(); | ||
| assertEquals(2, count[0]); | ||
| } | ||
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| } |
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