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/* * Created by Daniel Nadeau// w ww. ja v a2 s . c o m * daniel.nadeau01@gmail.com * danielnadeau.blogspot.com * * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to you 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 edu.openhsk.views; import java.util.ArrayList; import android.content.Context; import android.content.res.Resources; import android.content.res.TypedArray; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.Path; import android.graphics.Rect; import android.util.AttributeSet; import android.util.SparseArray; import android.view.View; import edu.openhsk.R; public class BarGraph extends View { private static final int VALUE_FONT_SIZE = 30; private static final int AXIS_LABEL_FONT_SIZE = 15; // How much space to leave between labels when shrunken. Increase for less space. private static final float LABEL_PADDING_MULTIPLIER = 1.6f; private ArrayList<Bar> mBars = new ArrayList<Bar>(); private Paint mPaint = new Paint(); private Rect mBoundsRect = new Rect(); private Rect mTextRect = new Rect(); private boolean mShowAxis; private boolean mShowAxisLabel; private boolean mShowBarText; private boolean mShowPopup; private int mAxisColor; private SparseArray<Float> valueTextSizes = new SparseArray<Float>(); public BarGraph(Context context) { this(context, null); } public BarGraph(Context context, AttributeSet attrs) { this(context, attrs, 0); } public BarGraph(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); TypedArray a = getContext().obtainStyledAttributes(attrs, R.styleable.BarGraph); mAxisColor = a.getColor(R.styleable.BarGraph_barAxisColor, Color.LTGRAY); mShowAxis = a.getBoolean(R.styleable.BarGraph_barShowAxis, true); mShowAxisLabel = a.getBoolean(R.styleable.BarGraph_barShowAxisLabel, true); mShowBarText = a.getBoolean(R.styleable.BarGraph_barShowText, true); mShowPopup = a.getBoolean(R.styleable.BarGraph_barShowPopup, true); a.recycle(); } public void setShowAxis(boolean show) { mShowAxis = show; } public void setShowAxisLabel(boolean show) { mShowAxisLabel = show; } public void setShowBarText(boolean show) { mShowBarText = show; } public void setBars(ArrayList<Bar> points) { mBars = points; postInvalidate(); } public ArrayList<Bar> getBars() { return mBars; } public void setAxisColor(int axisColor) { mAxisColor = axisColor; } public void onDraw(Canvas canvas) { final Resources resources = getContext().getResources(); canvas.drawColor(Color.TRANSPARENT); float maxValue = 0; float padding = 7 * resources.getDisplayMetrics().density; float bottomPadding = 30 * resources.getDisplayMetrics().density; float usableHeight; if (mShowBarText) { mPaint.setTextSize(VALUE_FONT_SIZE * resources.getDisplayMetrics().scaledDensity); mPaint.getTextBounds("$", 0, 1, mTextRect); if (mShowPopup) { usableHeight = getHeight() - bottomPadding - Math.abs(mTextRect.top - mTextRect.bottom) - 24 * resources.getDisplayMetrics().density; } else { usableHeight = getHeight() - bottomPadding - Math.abs(mTextRect.top - mTextRect.bottom) - 18 * resources.getDisplayMetrics().density; } } else { usableHeight = getHeight() - bottomPadding; } // Draw x-axis line if (mShowAxis) { mPaint.setColor(mAxisColor); mPaint.setStrokeWidth(2 * resources.getDisplayMetrics().density); mPaint.setAntiAlias(true); canvas.drawLine(0, getHeight() - bottomPadding + 10 * resources.getDisplayMetrics().density, getWidth(), getHeight() - bottomPadding + 10 * resources.getDisplayMetrics().density, mPaint); } float barWidth = (getWidth() - (padding * 2) * mBars.size()) / mBars.size(); // Maximum y value = sum of all values. for (final Bar bar : mBars) { if (bar.getValue() > maxValue) { maxValue = bar.getValue(); } } if (maxValue == 0) { maxValue = 1; } int count = 0; // Calculate the maximum text size for all the axis labels mPaint.setTextSize(AXIS_LABEL_FONT_SIZE * resources.getDisplayMetrics().scaledDensity); for (final Bar bar : mBars) { int left = (int) ((padding * 2) * count + padding + barWidth * count); int right = (int) ((padding * 2) * count + padding + barWidth * (count + 1)); float textWidth = mPaint.measureText(bar.getName()); // Decrease text size to fit and not overlap with other labels. while (right - left + (padding * LABEL_PADDING_MULTIPLIER) < textWidth) { mPaint.setTextSize(mPaint.getTextSize() - 1); textWidth = mPaint.measureText(bar.getName()); } count++; } // Save it to use later float labelTextSize = mPaint.getTextSize(); count = 0; for (final Bar bar : mBars) { // Set bar bounds int left = (int) ((padding * 2) * count + padding + barWidth * count); int top = (int) (getHeight() - bottomPadding - (usableHeight * (bar.getValue() / maxValue))); int right = (int) ((padding * 2) * count + padding + barWidth * (count + 1)); int bottom = (int) (getHeight() - bottomPadding); mBoundsRect.set(left, top, right, bottom); // Draw bar mPaint.setColor(bar.getColor()); canvas.drawRect(mBoundsRect, mPaint); // Create selection region Path p = bar.getPath(); p.reset(); p.addRect(mBoundsRect.left, mBoundsRect.top, mBoundsRect.right, mBoundsRect.bottom, Path.Direction.CW); bar.getRegion().set(mBoundsRect.left, mBoundsRect.top, mBoundsRect.right, mBoundsRect.bottom); // Draw x-axis label text if (mShowAxisLabel) { mPaint.setColor(bar.getLabelColor()); mPaint.setTextSize(labelTextSize); float textWidth = mPaint.measureText(bar.getName()); int x = (int) (((mBoundsRect.left + mBoundsRect.right) / 2) - (textWidth / 2)); int y = (int) (getHeight() - 3 * resources.getDisplayMetrics().scaledDensity); canvas.drawText(bar.getName(), x, y, mPaint); } // Draw value text if (mShowBarText) { mPaint.setTextSize(VALUE_FONT_SIZE * resources.getDisplayMetrics().scaledDensity); mPaint.setColor(bar.getValueColor()); mPaint.getTextBounds(bar.getValueString(), 0, 1, mTextRect); int boundLeft = (int) (((mBoundsRect.left + mBoundsRect.right) / 2) - (mPaint.measureText(bar.getValueString()) / 2) - 10 * resources.getDisplayMetrics().density); int boundTop = (int) (mBoundsRect.top + (mTextRect.top - mTextRect.bottom) - 18 * resources.getDisplayMetrics().density); int boundRight = (int) (((mBoundsRect.left + mBoundsRect.right) / 2) + (mPaint.measureText(bar.getValueString()) / 2) + 10 * resources.getDisplayMetrics().density); // Limit popup width to bar width if (boundLeft < mBoundsRect.left) { boundLeft = mBoundsRect.left - ((int) padding / 2); } if (boundRight > mBoundsRect.right) { boundRight = mBoundsRect.right + ((int) padding / 2); } // Check cache to see if we've done this calculation before if (0 > valueTextSizes.indexOfKey(bar.getValueString().length())) { while (mPaint.measureText(bar.getValueString()) > boundRight - boundLeft) { mPaint.setTextSize(mPaint.getTextSize() - (float) 1); } valueTextSizes.put(bar.getValueString().length(), mPaint.getTextSize()); } else { mPaint.setTextSize(valueTextSizes.get(bar.getValueString().length())); } canvas.drawText(bar.getValueString(), (int) (((mBoundsRect.left + mBoundsRect.right) / 2) - (mPaint.measureText(bar.getValueString())) / 2), mBoundsRect.top - (mBoundsRect.top - boundTop) / 2f + (float) Math.abs(mTextRect.top - mTextRect.bottom) / 2f * 0.7f, mPaint ); } count++; } } }