add CircleCutOutColorDrawable

README.md

@@ -25,6 +25,7 @@ Contents
 * [Graphics](de/slowpoke/androidtank/graphics)
  - [PathParcelable](de/slowpoke/androidtank/graphics/PathParcelable.java): a `android.graphics.Path` that implements `Parcelable`
 * [Drawable](de/slowpoke/androidtank/graphics/drawable)
+ - [CircleCutOutColorDrawable](de/slowpoke/androidtank/graphics/drawable/CircleCutOutColorDrawable.java): a `Drawable` that draws a color and leaves out a definable circle
  - [RotatedDrawable](de/slowpoke/androidtank/graphics/drawable/RotatedDrawable.java): a `Drawable` that can be programmatically rotated
 
 

library/build.gradle

@@ -1,6 +1,10 @@
 apply plugin: 'com.android.library'
 apply plugin: 'com.github.dcendents.android-maven'
 
+dependencies {
+    compile 'com.android.support:support-annotations:21.0.3'
+}
+
 android {
     compileSdkVersion 21
     buildToolsVersion '21.1.2'

library/src/main/java/de/slowpoke/androidtank/graphics/drawable/CircleCutOutColorDrawable.java

@@ -0,0 +1,133 @@
+/*
+ * Copyright 2015 Brian Hoffmann, slowpoke.de
+ *
+ * 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 de.slowpoke.androidtank.graphics.drawable;
+
+import android.content.res.Resources;
+import android.graphics.Canvas;
+import android.graphics.ColorFilter;
+import android.graphics.Paint;
+import android.graphics.Path;
+import android.graphics.PixelFormat;
+import android.graphics.PointF;
+import android.graphics.drawable.Drawable;
+import android.support.annotation.ColorRes;
+
+/**
+ * A Drawable that cuts out a circle.
+ */
+public class CircleCutOutColorDrawable extends Drawable {
+
+    private final CircleCutOutColorState mState;
+
+    public CircleCutOutColorDrawable(Resources res, @ColorRes int backgroundColor) {
+        this(res.getColor(backgroundColor));
+    }
+
+    public CircleCutOutColorDrawable(int backgroundColor) {
+        this(null);
+        mState.setColor(backgroundColor);
+    }
+
+    private CircleCutOutColorDrawable(CircleCutOutColorState state) {
+        mState = new CircleCutOutColorState(state);
+    }
+
+    /**
+     * Set the circle that will be cut out.
+     *
+     * @param center     center position
+     * @param diameterPx diameter of circle
+     */
+    public void setCircle(PointF center, float diameterPx) {
+        mState.mCenter = center;
+        mState.mRadius = diameterPx * 0.5f;
+        invalidateSelf();
+    }
+
+    @Override
+    public void draw(Canvas canvas) {
+        mState.mPath.reset();
+        mState.mPath.addRect(0, 0, canvas.getWidth(), canvas.getHeight(), Path.Direction.CW);
+
+        if (mState.mCenter != null) {
+            mState.mPath.addCircle(mState.mCenter.x, mState.mCenter.y, mState.mRadius, Path.Direction.CCW);
+        }
+
+        canvas.drawPath(mState.mPath, mState.mPaint);
+    }
+
+    @Override
+    public void setAlpha(int alpha) {
+        mState.mPaint.setAlpha(alpha);
+    }
+
+    @Override
+    public void setColorFilter(ColorFilter cf) {
+        mState.mPaint.setColorFilter(cf);
+    }
+
+    @Override
+    public int getOpacity() {
+        switch (mState.mPaint.getAlpha()) {
+            case 255:
+                return PixelFormat.OPAQUE;
+            case 0:
+                return PixelFormat.TRANSPARENT;
+        }
+        return PixelFormat.TRANSLUCENT;
+    }
+
+    final static class CircleCutOutColorState extends ConstantState {
+
+        private final Paint mPaint;
+        private final Path mPath;
+
+        private PointF mCenter;
+        private float mRadius;
+
+        CircleCutOutColorState(CircleCutOutColorState state) {
+            if (state != null) {
+                mPaint = state.mPaint;
+                mPath = state.mPath;
+                mCenter = new PointF(state.mCenter.x, state.mCenter.y);
+                mRadius = state.mRadius;
+            } else {
+                mPaint = new Paint();
+                mPaint.setAntiAlias(true);
+                mPaint.setStyle(Paint.Style.FILL);
+
+                mPath = new Path();
+                mPath.setFillType(Path.FillType.EVEN_ODD);
+            }
+        }
+
+        public void setColor(int color) {
+            mPaint.setColor(color);
+        }
+
+        @Override
+        public Drawable newDrawable() {
+            return new CircleCutOutColorDrawable(this);
+        }
+
+        @Override
+        public int getChangingConfigurations() {
+            return 0;
+        }
+
+    }
+}