Android Open Source - trifork-ibeacon-demo Bar Graph

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License

The source code is released under:
Apache License
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Java Source Code

/*
 *     Created by Daniel Nadeau//w  ww. ja v a 2s .  co  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 com.echo.holographlibrary;

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.Point;
import android.graphics.Rect;
import android.graphics.Region;
import android.graphics.drawable.NinePatchDrawable;
import android.util.AttributeSet;
import android.util.SparseArray;
import android.view.MotionEvent;
import android.view.View;

import java.util.ArrayList;

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 static final int ORIENTATION_HORIZONTAL = 0;
    private static final int ORIENTATION_VERTICAL = 1;

    private final int mOrientation;
    private ArrayList<Bar> mBars = new ArrayList<Bar>();
    private Paint mPaint = new Paint();
    private Rect mBoundsRect = new Rect();
    private Rect mTextRect = new Rect();
    private boolean mShowBarText = true;
    private boolean mShowAxis = true;
    private int mSelectedIndex = -1;
    private OnBarClickedListener mListener;
    private int mAxisColor;
    private int mMaxValue;

    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);
        mOrientation = a.getInt(R.styleable.BarGraph_orientation, ORIENTATION_VERTICAL);
        mAxisColor = a.getColor(R.styleable.BarGraph_barAxisColor, Color.LTGRAY);
    }

    public void setShowBarText(boolean show) {
        mShowBarText = show;
    }

    public void setShowAxis(boolean show) {
        mShowAxis = show;
    }

    public void setBars(ArrayList<Bar> points) {
        this.mBars = points;
        postInvalidate();
    }

    public ArrayList<Bar> getBars() {
        return this.mBars;
    }

    public void setAxisColor(int axisColor) {
        mAxisColor = axisColor;
    }

    public void setMaxValue(int value) {
        mMaxValue = value;
    }

    public void onDraw(Canvas canvas) {
        final Resources resources = getContext().getResources();

        canvas.drawColor(Color.TRANSPARENT);
        NinePatchDrawable popup = (NinePatchDrawable) resources.getDrawable(R.drawable.popup_black);

        float maxValue = 0;
        float padding = 1 * resources.getDisplayMetrics().density; // 7
        float bottomPadding = 10 * resources.getDisplayMetrics().density; // 30

        float usableHeight;
        if (mShowBarText) {
            this.mPaint.setTextSize(VALUE_FONT_SIZE * resources.getDisplayMetrics().scaledDensity);
            this.mPaint.getTextBounds("$", 0, 1, mTextRect);
            usableHeight = getHeight() - bottomPadding - Math.abs(mTextRect.top - mTextRect.bottom)
                    - 24 * 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 + 1 * resources.getDisplayMetrics().density,
                    getWidth(),
                    getHeight() - bottomPadding + 1 * resources.getDisplayMetrics().density, mPaint);
        }
        float barWidth = (getWidth() - (padding * 2) * mBars.size()) / mBars.size();

        // Maximum y value = sum of all values.
        if (mMaxValue > 0) {
            maxValue = mMaxValue;
        }  else {
            for (final Bar bar : mBars) {
                if (bar.getValue() > maxValue) {
                    maxValue = bar.getValue();
                }
            }
        }

        if (maxValue == 0) {
            maxValue = 1;
        }

        int count = 0;
        SparseArray<Float> valueTextSizes = new SparseArray<Float>();
        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
            if (count == mSelectedIndex && null != mListener) {
                this.mPaint.setColor(bar.getSelectedColor());
            } else {
                this.mPaint.setColor(bar.getColor());
            }
            canvas.drawRect(mBoundsRect, this.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 (mShowAxis) {
                this.mPaint.setColor(bar.getLabelColor());
                this.mPaint.setTextSize(AXIS_LABEL_FONT_SIZE
                        * resources.getDisplayMetrics().scaledDensity);
                float textWidth = this.mPaint.measureText(bar.getName());
                // Decrease text size to fit and not overlap with other labels.
                while (right - left + (padding * LABEL_PADDING_MULTIPLIER) < textWidth) {
                    this.mPaint.setTextSize(this.mPaint.getTextSize() - 1);
                    textWidth = this.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, this.mPaint);
            }

            // Draw value text
            if (mShowBarText) {
                this.mPaint.setTextSize(VALUE_FONT_SIZE
                        * resources.getDisplayMetrics().scaledDensity);
                this.mPaint.setColor(Color.WHITE);
                this.mPaint.getTextBounds(bar.getValueString(), 0, 1, mTextRect);

                int boundLeft = (int) (((mBoundsRect.left + mBoundsRect.right) / 2)
                        - (this.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)
                        + (this.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);
                }

                popup.setBounds(boundLeft, boundTop, boundRight, mBoundsRect.top);
                popup.draw(canvas);

                // Check cache to see if we've done this calculation before
                if (0 > valueTextSizes.indexOfKey(bar.getValueString().length())) {
                    while (this.mPaint.measureText(bar.getValueString()) > boundRight - boundLeft) {
                        this.mPaint.setTextSize(this.mPaint.getTextSize() - (float) 1);
                    }
                    valueTextSizes.put(bar.getValueString().length(), mPaint.getTextSize());
                } else {
                    this.mPaint.setTextSize(valueTextSizes.get(bar.getValueString().length()));
                }
                canvas.drawText(bar.getValueString(),
                        (int) (((mBoundsRect.left + mBoundsRect.right) / 2)
                                - (this.mPaint.measureText(bar.getValueString())) / 2),
                        mBoundsRect.top - (mBoundsRect.top - boundTop) / 2f
                                + (float) Math.abs(mTextRect.top - mTextRect.bottom) / 2f * 0.7f,
                        this.mPaint
                );
            }
            count++;
        }
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {

        Point point = new Point();
        point.x = (int) event.getX();
        point.y = (int) event.getY();

        int count = 0;
        Region r = new Region();
        for (Bar bar : mBars) {
            r.setPath(bar.getPath(), bar.getRegion());
            switch (event.getAction()) {
                default:
                    break;
                case MotionEvent.ACTION_DOWN:
                    if (r.contains(point.x, point.y)) {
                        mSelectedIndex = count;
                        postInvalidate();
                    }
                    break;
                case MotionEvent.ACTION_UP:
                    if (count == mSelectedIndex
                            && mListener != null
                            && r.contains(point.x, point.y)) {
                        mListener.onClick(mSelectedIndex);
                    }
                    break;
            }
            count++;
        }
        // Reset selection
        if (MotionEvent.ACTION_UP == event.getAction()
                || MotionEvent.ACTION_CANCEL == event.getAction()) {
            mSelectedIndex = -1;
            postInvalidate();
        }
        return true;
    }

    public void setOnBarClickedListener(OnBarClickedListener listener) {
        this.mListener = listener;
    }

    public interface OnBarClickedListener {
        abstract void onClick(int index);
    }
}
Java Source Code List
