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/*
* Copyright (C) 2014 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.hardware.input;
import android.os.Parcel;
import android.os.Parcelable;
/**
* Encapsulates calibration data for input devices.
*
* @hide
*/
public class TouchCalibration implements Parcelable {
public static final TouchCalibration IDENTITY = new TouchCalibration();
public static final Parcelable.Creator<TouchCalibration> CREATOR
= new Parcelable.Creator<TouchCalibration>() {
public TouchCalibration createFromParcel(Parcel in) {
return new TouchCalibration(in);
}
public TouchCalibration[] newArray(int size) {
return new TouchCalibration[size];
}
};
private final float mXScale, mXYMix, mXOffset;
private final float mYXMix, mYScale, mYOffset;
/**
* Create a new TouchCalibration initialized to the identity transformation.
*/
public TouchCalibration() {
this(1,0,0,0,1,0);
}
/**
* Create a new TouchCalibration from affine transformation paramters.
* @param xScale Influence of input x-axis value on output x-axis value.
* @param xyMix Influence of input y-axis value on output x-axis value.
* @param xOffset Constant offset to be applied to output x-axis value.
* @param yXMix Influence of input x-axis value on output y-axis value.
* @param yScale Influence of input y-axis value on output y-axis value.
* @param yOffset Constant offset to be applied to output y-axis value.
*/
public TouchCalibration(float xScale, float xyMix, float xOffset,
float yxMix, float yScale, float yOffset) {
mXScale = xScale;
mXYMix = xyMix;
mXOffset = xOffset;
mYXMix = yxMix;
mYScale = yScale;
mYOffset = yOffset;
}
public TouchCalibration(Parcel in) {
mXScale = in.readFloat();
mXYMix = in.readFloat();
mXOffset = in.readFloat();
mYXMix = in.readFloat();
mYScale = in.readFloat();
mYOffset = in.readFloat();
}
@Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeFloat(mXScale);
dest.writeFloat(mXYMix);
dest.writeFloat(mXOffset);
dest.writeFloat(mYXMix);
dest.writeFloat(mYScale);
dest.writeFloat(mYOffset);
}
@Override
public int describeContents() {
return 0;
}
public float[] getAffineTransform() {
return new float[] { mXScale, mXYMix, mXOffset, mYXMix, mYScale, mYOffset };
}
@Override
public boolean equals(Object obj) {
if (obj == this) {
return true;
} else if (obj instanceof TouchCalibration) {
TouchCalibration cal = (TouchCalibration)obj;
return (cal.mXScale == mXScale) &&
(cal.mXYMix == mXYMix) &&
(cal.mXOffset == mXOffset) &&
(cal.mYXMix == mYXMix) &&
(cal.mYScale == mYScale) &&
(cal.mYOffset == mYOffset);
} else {
return false;
}
}
@Override
public int hashCode() {
return Float.floatToIntBits(mXScale) ^
Float.floatToIntBits(mXYMix) ^
Float.floatToIntBits(mXOffset) ^
Float.floatToIntBits(mYXMix) ^
Float.floatToIntBits(mYScale) ^
Float.floatToIntBits(mYOffset);
}
@Override
public String toString() {
return String.format("[%f, %f, %f, %f, %f, %f]",
mXScale, mXYMix, mXOffset, mYXMix, mYScale, mYOffset);
}
}
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