The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2006 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package android.view.animation; |
| 18 | |
| 19 | import android.content.Context; |
| 20 | import android.content.res.TypedArray; |
| 21 | import android.util.AttributeSet; |
| 22 | |
| 23 | /** |
| 24 | * An animation that controls the scale of an object. You can specify the point |
| 25 | * to use for the center of scaling. |
| 26 | * |
| 27 | */ |
| 28 | public class ScaleAnimation extends Animation { |
| 29 | private float mFromX; |
| 30 | private float mToX; |
| 31 | private float mFromY; |
| 32 | private float mToY; |
| 33 | |
| 34 | private int mPivotXType = ABSOLUTE; |
| 35 | private int mPivotYType = ABSOLUTE; |
| 36 | private float mPivotXValue = 0.0f; |
| 37 | private float mPivotYValue = 0.0f; |
| 38 | |
| 39 | private float mPivotX; |
| 40 | private float mPivotY; |
| 41 | |
| 42 | /** |
The Android Open Source Project | bdbdc4f | 2009-03-03 21:00:54 -0800 | [diff] [blame] | 43 | * Constructor used when a ScaleAnimation is loaded from a resource. |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 44 | * |
| 45 | * @param context Application context to use |
| 46 | * @param attrs Attribute set from which to read values |
| 47 | */ |
| 48 | public ScaleAnimation(Context context, AttributeSet attrs) { |
| 49 | super(context, attrs); |
| 50 | |
| 51 | TypedArray a = context.obtainStyledAttributes(attrs, |
| 52 | com.android.internal.R.styleable.ScaleAnimation); |
| 53 | |
| 54 | mFromX = a.getFloat(com.android.internal.R.styleable.ScaleAnimation_fromXScale, 0.0f); |
| 55 | mToX = a.getFloat(com.android.internal.R.styleable.ScaleAnimation_toXScale, 0.0f); |
| 56 | |
| 57 | mFromY = a.getFloat(com.android.internal.R.styleable.ScaleAnimation_fromYScale, 0.0f); |
| 58 | mToY = a.getFloat(com.android.internal.R.styleable.ScaleAnimation_toYScale, 0.0f); |
| 59 | |
| 60 | Description d = Description.parseValue(a.peekValue( |
| 61 | com.android.internal.R.styleable.ScaleAnimation_pivotX)); |
| 62 | mPivotXType = d.type; |
| 63 | mPivotXValue = d.value; |
| 64 | |
| 65 | d = Description.parseValue(a.peekValue( |
| 66 | com.android.internal.R.styleable.ScaleAnimation_pivotY)); |
| 67 | mPivotYType = d.type; |
| 68 | mPivotYValue = d.value; |
| 69 | |
| 70 | a.recycle(); |
| 71 | } |
| 72 | |
| 73 | /** |
| 74 | * Constructor to use when building a ScaleAnimation from code |
| 75 | * |
| 76 | * @param fromX Horizontal scaling factor to apply at the start of the |
| 77 | * animation |
| 78 | * @param toX Horizontal scaling factor to apply at the end of the animation |
| 79 | * @param fromY Vertical scaling factor to apply at the start of the |
| 80 | * animation |
| 81 | * @param toY Vertical scaling factor to apply at the end of the animation |
| 82 | */ |
| 83 | public ScaleAnimation(float fromX, float toX, float fromY, float toY) { |
| 84 | mFromX = fromX; |
| 85 | mToX = toX; |
| 86 | mFromY = fromY; |
| 87 | mToY = toY; |
| 88 | mPivotX = 0; |
| 89 | mPivotY = 0; |
| 90 | } |
| 91 | |
| 92 | /** |
| 93 | * Constructor to use when building a ScaleAnimation from code |
| 94 | * |
| 95 | * @param fromX Horizontal scaling factor to apply at the start of the |
| 96 | * animation |
| 97 | * @param toX Horizontal scaling factor to apply at the end of the animation |
| 98 | * @param fromY Vertical scaling factor to apply at the start of the |
| 99 | * animation |
| 100 | * @param toY Vertical scaling factor to apply at the end of the animation |
| 101 | * @param pivotX The X coordinate of the point about which the object is |
| 102 | * being scaled, specified as an absolute number where 0 is the left |
| 103 | * edge. (This point remains fixed while the object changes size.) |
| 104 | * @param pivotY The Y coordinate of the point about which the object is |
| 105 | * being scaled, specified as an absolute number where 0 is the top |
| 106 | * edge. (This point remains fixed while the object changes size.) |
| 107 | */ |
| 108 | public ScaleAnimation(float fromX, float toX, float fromY, float toY, |
| 109 | float pivotX, float pivotY) { |
| 110 | mFromX = fromX; |
| 111 | mToX = toX; |
| 112 | mFromY = fromY; |
| 113 | mToY = toY; |
| 114 | |
| 115 | mPivotXType = ABSOLUTE; |
| 116 | mPivotYType = ABSOLUTE; |
| 117 | mPivotXValue = pivotX; |
| 118 | mPivotYValue = pivotY; |
| 119 | } |
| 120 | |
| 121 | /** |
| 122 | * Constructor to use when building a ScaleAnimation from code |
| 123 | * |
| 124 | * @param fromX Horizontal scaling factor to apply at the start of the |
| 125 | * animation |
| 126 | * @param toX Horizontal scaling factor to apply at the end of the animation |
| 127 | * @param fromY Vertical scaling factor to apply at the start of the |
| 128 | * animation |
| 129 | * @param toY Vertical scaling factor to apply at the end of the animation |
| 130 | * @param pivotXType Specifies how pivotXValue should be interpreted. One of |
| 131 | * Animation.ABSOLUTE, Animation.RELATIVE_TO_SELF, or |
| 132 | * Animation.RELATIVE_TO_PARENT. |
| 133 | * @param pivotXValue The X coordinate of the point about which the object |
| 134 | * is being scaled, specified as an absolute number where 0 is the |
| 135 | * left edge. (This point remains fixed while the object changes |
| 136 | * size.) This value can either be an absolute number if pivotXType |
| 137 | * is ABSOLUTE, or a percentage (where 1.0 is 100%) otherwise. |
| 138 | * @param pivotYType Specifies how pivotYValue should be interpreted. One of |
| 139 | * Animation.ABSOLUTE, Animation.RELATIVE_TO_SELF, or |
| 140 | * Animation.RELATIVE_TO_PARENT. |
| 141 | * @param pivotYValue The Y coordinate of the point about which the object |
| 142 | * is being scaled, specified as an absolute number where 0 is the |
| 143 | * top edge. (This point remains fixed while the object changes |
| 144 | * size.) This value can either be an absolute number if pivotYType |
| 145 | * is ABSOLUTE, or a percentage (where 1.0 is 100%) otherwise. |
| 146 | */ |
| 147 | public ScaleAnimation(float fromX, float toX, float fromY, float toY, |
| 148 | int pivotXType, float pivotXValue, int pivotYType, float pivotYValue) { |
| 149 | mFromX = fromX; |
| 150 | mToX = toX; |
| 151 | mFromY = fromY; |
| 152 | mToY = toY; |
| 153 | |
| 154 | mPivotXValue = pivotXValue; |
| 155 | mPivotXType = pivotXType; |
| 156 | mPivotYValue = pivotYValue; |
| 157 | mPivotYType = pivotYType; |
| 158 | } |
| 159 | |
| 160 | @Override |
| 161 | protected void applyTransformation(float interpolatedTime, Transformation t) { |
| 162 | float sx = 1.0f; |
| 163 | float sy = 1.0f; |
Chet Haase | 4846032 | 2010-06-11 14:22:25 -0700 | [diff] [blame^] | 164 | float scale = getScaleFactor(); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 165 | |
| 166 | if (mFromX != 1.0f || mToX != 1.0f) { |
| 167 | sx = mFromX + ((mToX - mFromX) * interpolatedTime); |
| 168 | } |
| 169 | if (mFromY != 1.0f || mToY != 1.0f) { |
| 170 | sy = mFromY + ((mToY - mFromY) * interpolatedTime); |
| 171 | } |
| 172 | |
| 173 | if (mPivotX == 0 && mPivotY == 0) { |
| 174 | t.getMatrix().setScale(sx, sy); |
| 175 | } else { |
Chet Haase | 4846032 | 2010-06-11 14:22:25 -0700 | [diff] [blame^] | 176 | t.getMatrix().setScale(sx, sy, scale * mPivotX, scale * mPivotY); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 177 | } |
| 178 | } |
| 179 | |
| 180 | @Override |
| 181 | public void initialize(int width, int height, int parentWidth, int parentHeight) { |
| 182 | super.initialize(width, height, parentWidth, parentHeight); |
| 183 | |
| 184 | mPivotX = resolveSize(mPivotXType, mPivotXValue, width, parentWidth); |
| 185 | mPivotY = resolveSize(mPivotYType, mPivotYValue, height, parentHeight); |
| 186 | } |
| 187 | } |