1 /* 2 * Copyright 2012 AndroidPlot.com 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 com.androidplot.ui; 18 19 public abstract class PositionMetric<LayoutType extends Enum> extends LayoutMetric<LayoutType> { 20 21 protected enum Origin { 22 FROM_BEGINING, 23 FROM_CENTER, 24 FROM_END 25 } 26 27 protected enum LayoutMode { 28 ABSOLUTE, 29 RELATIVE 30 } 31 PositionMetric(float value, LayoutType layoutType)32 public PositionMetric(float value, LayoutType layoutType) { 33 super(value, layoutType); 34 } 35 36 /** 37 * Throws IllegalArgumentException if there is a problem. 38 * @param value 39 * @param layoutMode 40 * @throws IllegalArgumentException 41 */ validateValue(float value, LayoutMode layoutMode)42 protected static void validateValue(float value, LayoutMode layoutMode) throws IllegalArgumentException { 43 switch(layoutMode) { 44 case ABSOLUTE: 45 break; 46 case RELATIVE: 47 if(value < -1 || value > 1) { 48 throw new IllegalArgumentException("Relative layout values must be within the range of -1 to 1."); 49 } 50 break; 51 default: 52 throw new IllegalArgumentException("Unknown LayoutMode: " + layoutMode); 53 } 54 55 } 56 getAbsolutePosition(float size, Origin origin)57 protected float getAbsolutePosition(float size, Origin origin) { 58 switch(origin) { 59 case FROM_BEGINING: 60 return getValue(); 61 case FROM_CENTER: 62 return (size/2f) + getValue(); 63 case FROM_END: 64 return size - getValue(); 65 default: 66 throw new IllegalArgumentException("Unsupported Origin: " + origin); 67 } 68 } 69 getRelativePosition(float size, Origin origin)70 protected float getRelativePosition(float size, Origin origin) { 71 //throw new UnsupportedOperationException("Not yet implemented."); 72 73 switch(origin) { 74 case FROM_BEGINING: 75 return size * getValue(); 76 case FROM_CENTER: 77 return (size/2f) + ((size/2f) * getValue()); 78 case FROM_END: 79 return size + (size*getValue()); 80 default: 81 throw new IllegalArgumentException("Unsupported Origin: " + origin); 82 } 83 84 } 85 86 87 } 88