1 /* 2 * Copyright (C) 2011 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 com.android.settings.widget; 18 19 import android.content.res.Resources; 20 import android.text.SpannableStringBuilder; 21 22 /** 23 * Axis along a {@link ChartView} that knows how to convert between raw point 24 * and screen coordinate systems. 25 */ 26 public interface ChartAxis { 27 28 /** Set range of raw values this axis should cover. */ 29 public boolean setBounds(long min, long max); 30 /** Set range of screen points this axis should cover. */ 31 public boolean setSize(float size); 32 33 /** Convert raw value into screen point. */ 34 public float convertToPoint(long value); 35 /** Convert screen point into raw value. */ 36 public long convertToValue(float point); 37 38 /** 39 * Build label that describes given raw value. If the label is rounded for 40 * display, return the rounded value. 41 */ 42 public long buildLabel(Resources res, SpannableStringBuilder builder, long value); 43 44 /** Return list of tick points for drawing a grid. */ 45 public float[] getTickPoints(); 46 47 /** 48 * Test if given raw value should cause the axis to grow or shrink; 49 * returning positive value to grow and negative to shrink. 50 */ 51 public int shouldAdjustAxis(long value); 52 53 } 54
