Initial Contribution

1 files changed, 152 insertions, 0 deletions

diff --git a/graphics/java/android/graphics/PathMeasure.java b/graphics/java/android/graphics/PathMeasure.java
new file mode 100644
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+++ b/graphics/java/android/graphics/PathMeasure.java
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+/*
+ * Copyright (C) 2007 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.graphics;
+
+public class PathMeasure {
+
+    /**
+     * Create an empty PathMeasure object. To uses this to measure the length
+     * of a path, and/or to find the position and tangent along it, call
+     * setPath.
+     *
+     * Note that once a path is associated with the measure object, it is
+     * undefined if the path is subsequently modified and the the measure object
+     * is used. If the path is modified, you must call setPath with the path.
+     */
+    public PathMeasure() {
+        native_instance = native_create(0, false);
+    }
+    
+    /**
+     * Create a PathMeasure object associated with the specified path object
+     * (already created and specified). The meansure object can now return the
+     * path's length, and the position and tangent of any position along the
+     * path.
+     *
+     * Note that once a path is associated with the measure object, it is
+     * undefined if the path is subsequently modified and the the measure object
+     * is used. If the path is modified, you must call setPath with the path.
+     *
+     * @param path The path that will be measured by this object
+     * @param forceClosed If true, then the path will be considered as "closed"
+     *        even if its contour was not explicitly closed.
+     */
+    public PathMeasure(Path path, boolean forceClosed) {
+        // note: the native side makes a copy of path, so we don't need a java
+        // reference to it here, since it's fine if it gets GC'd
+        native_instance = native_create(path != null ? path.ni() : 0,
+                                        forceClosed);
+    }
+
+    /**
+     * Assign a new path, or null to have none.
+     */
+    public void setPath(Path path, boolean forceClosed) {
+        // note: the native side makes a copy of path, so we don't need a java
+        // reference to it here, since it's fine if it gets GC'd
+        native_setPath(native_instance,
+                       path != null ? path.ni() : 0,
+                       forceClosed);
+    }
+
+    /**
+     * Return the total length of the current contour, or 0 if no path is
+     * associated with this measure object.
+     */
+    public float getLength() {
+        return native_getLength(native_instance);
+    }
+
+    /**
+     * Pins distance to 0 <= distance <= getLength(), and then computes the
+     * corresponding position and tangent. Returns false if there is no path,
+     * or a zero-length path was specified, in which case position and tangent
+     * are unchanged.
+     *
+     * @param distance The distance along the current contour to sample
+     * @param pos If not null, eturns the sampled position (x==[0], y==[1])
+     * @param tan If not null, returns the sampled tangent (x==[0], y==[1])
+     * @return false if there was no path associated with this measure object
+    */
+    public boolean getPosTan(float distance, float pos[], float tan[]) {
+        if (pos != null && pos.length < 2 ||
+            tan != null && tan.length < 2) {
+            throw new ArrayIndexOutOfBoundsException();
+        }
+        return native_getPosTan(native_instance, distance, pos, tan);
+    }
+
+    public static final int POSITION_MATRIX_FLAG = 0x01;    // must match flags in SkPathMeasure.h
+    public static final int TANGENT_MATRIX_FLAG  = 0x02;    // must match flags in SkPathMeasure.h
+
+    /**
+     * Pins distance to 0 <= distance <= getLength(), and then computes the
+     * corresponding matrix. Returns false if there is no path, or a zero-length
+     * path was specified, in which case matrix is unchanged.
+     *
+     * @param distance The distance along the associated path
+     * @param matrix Allocated by the caller, this is set to the transformation
+     *        associated with the position and tangent at the specified distance
+     * @param flags Specified what aspects should be returned in the matrix.
+     */
+    public boolean getMatrix(float distance, Matrix matrix, int flags) {
+        return native_getMatrix(native_instance, distance, matrix.native_instance, flags);
+    }
+
+    /**
+     * Given a start and stop distance, return in dst the intervening
+     * segment(s). If the segment is zero-length, return false, else return
+     * true. startD and stopD are pinned to legal values (0..getLength()).
+     * If startD <= stopD then return false (and leave dst untouched).
+     * Begin the segment with a moveTo if startWithMoveTo is true
+     */
+    public boolean getSegment(float startD, float stopD, Path dst, boolean startWithMoveTo) {
+        return native_getSegment(native_instance, startD, stopD, dst.ni(), startWithMoveTo);
+    }
+
+    /**
+     * Return true if the current contour is closed()
+     */
+    public boolean isClosed() {
+        return native_isClosed(native_instance);
+    }
+
+    /**
+     * Move to the next contour in the path. Return true if one exists, or
+     * false if we're done with the path.
+     */
+    public boolean nextContour() {
+        return native_nextContour(native_instance);
+    }
+
+    protected void finalize() throws Throwable {
+        native_destroy(native_instance);
+    }
+
+    private static native int native_create(int native_path, boolean forceClosed);
+    private static native void native_setPath(int native_instance, int native_path, boolean forceClosed);
+    private static native float native_getLength(int native_instance);
+    private static native boolean native_getPosTan(int native_instance, float distance, float pos[], float tan[]);
+    private static native boolean native_getMatrix(int native_instance, float distance, int native_matrix, int flags);
+    private static native boolean native_getSegment(int native_instance, float startD, float stopD, int native_path, boolean startWithMoveTo);
+    private static native boolean native_isClosed(int native_instance);
+    private static native boolean native_nextContour(int native_instance);
+    private static native void native_destroy(int native_instance);
+
+    /* package */private final int native_instance;
+}
+