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. */
setBounds(long min, long max)29     public boolean setBounds(long min, long max);
30     /** Set range of screen points this axis should cover. */
setSize(float size)31     public boolean setSize(float size);
32 
33     /** Convert raw value into screen point. */
convertToPoint(long value)34     public float convertToPoint(long value);
35     /** Convert screen point into raw value. */
convertToValue(float point)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      */
buildLabel(Resources res, SpannableStringBuilder builder, long value)42     public long buildLabel(Resources res, SpannableStringBuilder builder, long value);
43 
44     /** Return list of tick points for drawing a grid. */
getTickPoints()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      */
shouldAdjustAxis(long value)51     public int shouldAdjustAxis(long value);
52 
53 }
54