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/*
* Copyright (C) 2011 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 com.android.settings.widget;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.view.View;
import com.android.settings.R;
import com.google.common.base.Preconditions;
/**
* Background of {@link ChartView} that renders grid lines as requested by
* {@link ChartAxis#getTickPoints()}.
*/
public class ChartGridView extends View {
// TODO: eventually teach about drawing chart labels
private ChartAxis mHoriz;
private ChartAxis mVert;
private Drawable mPrimary;
private Drawable mSecondary;
private Drawable mBorder;
public ChartGridView(Context context) {
this(context, null, 0);
}
public ChartGridView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public ChartGridView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
setWillNotDraw(false);
final TypedArray a = context.obtainStyledAttributes(
attrs, R.styleable.ChartGridView, defStyle, 0);
mPrimary = a.getDrawable(R.styleable.ChartGridView_primaryDrawable);
mSecondary = a.getDrawable(R.styleable.ChartGridView_secondaryDrawable);
mBorder = a.getDrawable(R.styleable.ChartGridView_borderDrawable);
// TODO: eventually read labelColor
a.recycle();
}
void init(ChartAxis horiz, ChartAxis vert) {
mHoriz = Preconditions.checkNotNull(horiz, "missing horiz");
mVert = Preconditions.checkNotNull(vert, "missing vert");
}
@Override
protected void onDraw(Canvas canvas) {
final int width = getWidth();
final int height = getHeight();
final Drawable secondary = mSecondary;
final int secondaryHeight = mSecondary.getIntrinsicHeight();
final float[] vertTicks = mVert.getTickPoints();
for (float y : vertTicks) {
final int bottom = (int) Math.min(y + secondaryHeight, height);
secondary.setBounds(0, (int) y, width, bottom);
secondary.draw(canvas);
}
final Drawable primary = mPrimary;
final int primaryWidth = mPrimary.getIntrinsicWidth();
final int primaryHeight = mPrimary.getIntrinsicHeight();
final float[] horizTicks = mHoriz.getTickPoints();
for (float x : horizTicks) {
final int right = (int) Math.min(x + primaryWidth, width);
primary.setBounds((int) x, 0, right, height);
primary.draw(canvas);
}
mBorder.setBounds(0, 0, width, height);
mBorder.draw(canvas);
}
}
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