/**
* A class that contains utility methods related to numbers.
- *
+ *
* @hide Pending API council approval
*/
public final class MathUtils {
}
public static float abs(float v) {
- return v > 0 ? v : -v;
+ return v > 0 ? v : -v;
}
public static int constrain(int amount, int low, int high) {
return v * v;
}
+ public static float dot(float v1x, float v1y, float v2x, float v2y) {
+ return v1x * v2x + v1y * v2y;
+ }
+
+ public static float cross(float v1x, float v1y, float v2x, float v2y) {
+ return v1x * v2y - v1y * v2x;
+ }
+
public static float radians(float degrees) {
return degrees * DEG_TO_RAD;
}
public static float tan(float angle) {
return (float) Math.tan(angle);
- }
+ }
public static float lerp(float start, float stop, float amount) {
return start + (stop - start) * amount;
}
-
+
public static float norm(float start, float stop, float value) {
return (value - start) / (stop - start);
}
-
+
public static float map(float minStart, float minStop, float maxStart, float maxStop, float value) {
return maxStart + (maxStart - maxStop) * ((value - minStart) / (minStop - minStart));
}
if (howsmall >= howbig) return howsmall;
return (int) (sRandom.nextFloat() * (howbig - howsmall) + howsmall);
}
-
+
public static float random(float howbig) {
return sRandom.nextFloat() * howbig;
}
import android.util.AttributeSet;
import android.util.LayoutDirection;
import android.util.Log;
+import android.util.MathUtils;
import android.util.PathParser;
import android.util.Xml;
final float scaleX = w / mViewportWidth;
final float scaleY = h / mViewportHeight;
final float minScale = Math.min(scaleX, scaleY);
+ final Matrix groupStackedMatrix = vGroup.mStackedMatrix;
- mFinalPathMatrix.set(vGroup.mStackedMatrix);
+ mFinalPathMatrix.set(groupStackedMatrix);
mFinalPathMatrix.postScale(scaleX, scaleY);
+ final float matrixScale = getMatrixScale(groupStackedMatrix);
+ if (matrixScale == 0) {
+ // When either x or y is scaled to 0, we don't need to draw anything.
+ return;
+ }
vPath.toPath(mPath);
final Path path = mPath;
strokePaint.setStrokeMiter(fullPath.mStrokeMiterlimit);
strokePaint.setColor(applyAlpha(fullPath.mStrokeColor, fullPath.mStrokeAlpha));
strokePaint.setColorFilter(filter);
- strokePaint.setStrokeWidth(fullPath.mStrokeWidth * minScale);
+ final float finalStrokeScale = minScale * matrixScale;
+ strokePaint.setStrokeWidth(fullPath.mStrokeWidth * finalStrokeScale);
canvas.drawPath(mRenderPath, strokePaint);
}
}
}
+
+ private float getMatrixScale(Matrix groupStackedMatrix) {
+ // Given unit vectors A = (0, 1) and B = (1, 0).
+ // After matrix mapping, we got A' and B'. Let theta = the angel b/t A' and B'.
+ // Therefore, the final scale we want is min(|A'| * sin(theta), |B'| * sin(theta)),
+ // which is (|A'| * |B'| * sin(theta)) / max (|A'|, |B'|);
+ // If max (|A'|, |B'|) = 0, that means either x or y has a scale of 0.
+ //
+ // For non-skew case, which is most of the cases, matrix scale is computing exactly the
+ // scale on x and y axis, and take the minimal of these two.
+ // For skew case, an unit square will mapped to a parallelogram. And this function will
+ // return the minimal height of the 2 bases.
+ float[] unitVectors = new float[] {0, 1, 1, 0};
+ groupStackedMatrix.mapVectors(unitVectors);
+ float scaleX = MathUtils.mag(unitVectors[0], unitVectors[1]);
+ float scaleY = MathUtils.mag(unitVectors[2], unitVectors[3]);
+ float crossProduct = MathUtils.cross(unitVectors[0], unitVectors[1],
+ unitVectors[2], unitVectors[3]);
+ float maxScale = MathUtils.max(scaleX, scaleY);
+
+ float matrixScale = 0;
+ if (maxScale > 0) {
+ matrixScale = MathUtils.abs(crossProduct) / maxScale;
+ }
+ if (DBG_VECTOR_DRAWABLE) {
+ Log.d(LOGTAG, "Scale x " + scaleX + " y " + scaleY + " final " + matrixScale);
+ }
+ return matrixScale;
+ }
}
private static class VGroup {
--- /dev/null
+<!--
+ Copyright (C) 2015 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.
+-->
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+ android:height="64dp"
+ android:viewportHeight="200"
+ android:viewportWidth="200"
+ android:width="64dp" >
+
+ <group>
+ <path
+ android:name="background1"
+ android:fillColor="#FF000000"
+ android:pathData="M 0,0 l 100,0 l 0, 100 l -100, 0 z" />
+ <path
+ android:name="background2"
+ android:fillColor="#FF000000"
+ android:pathData="M 100,100 l 100,0 l 0, 100 l -100, 0 z" />
+ </group>
+ <group
+ android:pivotX="0"
+ android:pivotY="0"
+ android:rotation="90" >
+ <group
+ android:scaleX="1.5"
+ android:scaleY="1" >
+ <group
+ android:pivotX="0"
+ android:pivotY="0"
+ android:rotation="-90" >
+ <group
+ android:scaleX="1.5"
+ android:scaleY="1" >
+ <path
+ android:name="twoLines"
+ android:fillColor="#FFFF0000"
+ android:pathData="M 100, 0 l 0, 100, -100, 0 z"
+ android:strokeColor="#FF00FF00"
+ android:strokeWidth="10" />
+ </group>
+ </group>
+ </group>
+ </group>
+
+</vector>
\ No newline at end of file
--- /dev/null
+<!--
+ Copyright (C) 2015 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.
+-->
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+ android:height="64dp"
+ android:viewportHeight="200"
+ android:viewportWidth="200"
+ android:width="64dp" >
+
+ <group>
+ <path
+ android:name="background1"
+ android:fillColor="#FF000000"
+ android:pathData="M 0,0 l 100,0 l 0, 100 l -100, 0 z" />
+ <path
+ android:name="background2"
+ android:fillColor="#FF000000"
+ android:pathData="M 100,100 l 100,0 l 0, 100 l -100, 0 z" />
+ </group>
+ <group
+ android:scaleX="-1"
+ android:scaleY="-1" >
+ <group
+ android:scaleX="-1"
+ android:scaleY="-1" >
+ <group
+ android:pivotX="100"
+ android:pivotY="100"
+ android:rotation="45" >
+ <path
+ android:name="twoLines"
+ android:fillColor="#FFFF0000"
+ android:pathData="M 100, 0 l 0, 100, -100, 0 z"
+ android:strokeColor="#FF00FF00"
+ android:strokeWidth="10" />
+ </group>
+ </group>
+ </group>
+
+</vector>
\ No newline at end of file
--- /dev/null
+<!--
+ Copyright (C) 2015 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.
+-->
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+ android:height="64dp"
+ android:viewportHeight="200"
+ android:viewportWidth="200"
+ android:width="64dp" >
+
+ <group>
+ <path
+ android:name="background1"
+ android:fillColor="#FF000000"
+ android:pathData="M 0,0 l 100,0 l 0, 100 l -100, 0 z" />
+ <path
+ android:name="background2"
+ android:fillColor="#FF000000"
+ android:pathData="M 100,100 l 100,0 l 0, 100 l -100, 0 z" />
+ </group>
+ <group
+ android:scaleX="2"
+ android:scaleY="0.5" >
+ <group
+ android:pivotX="100"
+ android:pivotY="100"
+ android:rotation="45" >
+ <path
+ android:name="twoLines"
+ android:fillColor="#FFFF0000"
+ android:pathData="M 100, 0 l 0, 100, -100, 0 z"
+ android:strokeColor="#FF00FF00"
+ android:strokeWidth="10" />
+ </group>
+ </group>
+
+</vector>
\ No newline at end of file
--- /dev/null
+<!--
+ Copyright (C) 2015 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.
+-->
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+ android:height="64dp"
+ android:viewportHeight="200"
+ android:viewportWidth="200"
+ android:width="64dp" >
+
+ <group>
+ <path
+ android:name="background1"
+ android:fillColor="#FF000000"
+ android:pathData="M 0,0 l 100,0 l 0, 100 l -100, 0 z" />
+ <path
+ android:name="background2"
+ android:fillColor="#FF000000"
+ android:pathData="M 100,100 l 100,0 l 0, 100 l -100, 0 z" />
+ </group>
+ <group
+ android:pivotX="0"
+ android:pivotY="0"
+ android:rotation="45" >
+ <group
+ android:pivotX="0"
+ android:pivotY="0"
+ android:rotation="90" >
+ <group
+ android:scaleX="1.5"
+ android:scaleY="1" >
+ <group
+ android:pivotX="0"
+ android:pivotY="0"
+ android:rotation="-90" >
+ <group
+ android:scaleX="1.5"
+ android:scaleY="1" >
+ <path
+ android:name="twoLines"
+ android:fillColor="#FFFF0000"
+ android:pathData="M 100, 0 l 0, 100, -100, 0 z"
+ android:strokeColor="#FF00FF00"
+ android:strokeWidth="10" />
+ </group>
+ </group>
+ </group>
+ </group>
+ </group>
+
+</vector>
\ No newline at end of file
R.drawable.vector_drawable28,
R.drawable.vector_drawable29,
R.drawable.vector_drawable30,
+ R.drawable.vector_drawable_scale0,
+ R.drawable.vector_drawable_scale1,
+ R.drawable.vector_drawable_scale2,
+ R.drawable.vector_drawable_scale3,
};
public static VectorDrawable create(Resources resources, int rid) {
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