HorizontalBarChart.java

package com.github.mikephil.charting.charts;

import android.content.Context;
import android.graphics.Matrix;
import android.graphics.PointF;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.util.Log;

import com.github.mikephil.charting.components.Legend.LegendPosition;
import com.github.mikephil.charting.components.XAxis.XAxisPosition;
import com.github.mikephil.charting.components.YAxis.AxisDependency;
import com.github.mikephil.charting.data.BarDataSet;
import com.github.mikephil.charting.data.BarEntry;
import com.github.mikephil.charting.data.Entry;
import com.github.mikephil.charting.renderer.HorizontalBarChartRenderer;
import com.github.mikephil.charting.renderer.XAxisRendererHorizontalBarChart;
import com.github.mikephil.charting.renderer.YAxisRendererHorizontalBarChart;
import com.github.mikephil.charting.utils.Highlight;
import com.github.mikephil.charting.utils.TransformerHorizontalBarChart;
import com.github.mikephil.charting.utils.Utils;

/**
 * BarChart with horizontal bar orientation. In this implementation, x- and
 * y-axis are switched, meaning the YAxis class represents the horizontal values
 * and the XAxis class represents the vertical values.
 * 
 * @author Philipp Jahoda
 */
public class HorizontalBarChart extends BarChart {

    public HorizontalBarChart(Context context) {
        super(context);
    }

    public HorizontalBarChart(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public HorizontalBarChart(Context context, AttributeSet attrs,
            int defStyle) {
        super(context, attrs, defStyle);
    }

    @Override
    protected void init() {
        super.init();
        
        mLeftAxisTransformer = new TransformerHorizontalBarChart(mViewPortHandler);
        mRightAxisTransformer = new TransformerHorizontalBarChart(mViewPortHandler);

        mRenderer = new HorizontalBarChartRenderer(this, mAnimator, mViewPortHandler);
        mAxisRendererLeft = new YAxisRendererHorizontalBarChart(mViewPortHandler, mAxisLeft,
                mLeftAxisTransformer);
        mAxisRendererRight = new YAxisRendererHorizontalBarChart(mViewPortHandler, mAxisRight,
                mRightAxisTransformer);
        mXAxisRenderer = new XAxisRendererHorizontalBarChart(mViewPortHandler, mXAxis,
                mLeftAxisTransformer, this);
    }

    @Override
    protected void calculateOffsets() {

        float offsetLeft = 0f, offsetRight = 0f, offsetTop = 0f, offsetBottom = 0f;

        // setup offsets for legend
        if (mLegend != null && mLegend.isEnabled()) {

            if (mLegend.getPosition() == LegendPosition.RIGHT_OF_CHART
                    || mLegend.getPosition() == LegendPosition.RIGHT_OF_CHART_CENTER) {

                offsetRight += mLegend.mTextWidthMax + mLegend.getXOffset() * 2f;

            } else if (mLegend.getPosition() == LegendPosition.LEFT_OF_CHART
                    || mLegend.getPosition() == LegendPosition.LEFT_OF_CHART_CENTER) {

                offsetLeft += mLegend.mTextWidthMax + mLegend.getXOffset() * 2f;

            } else if (mLegend.getPosition() == LegendPosition.BELOW_CHART_LEFT
                    || mLegend.getPosition() == LegendPosition.BELOW_CHART_RIGHT
                    || mLegend.getPosition() == LegendPosition.BELOW_CHART_CENTER) {

                offsetBottom += mLegend.mTextHeightMax * 3f;
            }
        }

        // offsets for y-labels
        if (mAxisLeft.needsOffset()) {
            offsetTop += mAxisLeft.getRequiredHeightSpace(mAxisRendererLeft.getPaintAxisLabels());
        }

        if (mAxisRight.needsOffset()) {
            offsetBottom += mAxisRight.getRequiredHeightSpace(mAxisRendererRight
                    .getPaintAxisLabels());
        }

        float xlabelwidth = mXAxis.mLabelWidth;

        if (mXAxis.isEnabled()) {

            // offsets for x-labels
            if (mXAxis.getPosition() == XAxisPosition.BOTTOM) {

                offsetLeft += xlabelwidth;

            } else if (mXAxis.getPosition() == XAxisPosition.TOP) {

                offsetRight += xlabelwidth;

            } else if (mXAxis.getPosition() == XAxisPosition.BOTH_SIDED) {

                offsetLeft += xlabelwidth;
                offsetRight += xlabelwidth;
            }
        }

        float min = Utils.convertDpToPixel(10f);

        mViewPortHandler.restrainViewPort(Math.max(min, offsetLeft), Math.max(min, offsetTop),
                Math.max(min, offsetRight), Math.max(min, offsetBottom));

        if (mLogEnabled) {
            Log.i(LOG_TAG, "offsetLeft: " + offsetLeft + ", offsetTop: " + offsetTop
                    + ", offsetRight: " + offsetRight + ", offsetBottom: " + offsetBottom);
            Log.i(LOG_TAG, "Content: " + mViewPortHandler.getContentRect().toString());
        }

        prepareOffsetMatrix();
        prepareValuePxMatrix();
    }

    @Override
    protected void prepareValuePxMatrix() {
        mRightAxisTransformer.prepareMatrixValuePx(mAxisRight.mAxisMinimum, mAxisRight.mAxisRange,
                mDeltaX,
                mXChartMin);
        mLeftAxisTransformer.prepareMatrixValuePx(mAxisLeft.mAxisMinimum, mAxisLeft.mAxisRange,
                mDeltaX,
                mXChartMin);
    }

    @Override
    protected void calcModulus() {
        float[] values = new float[9];
        mViewPortHandler.getMatrixTouch().getValues(values);

        mXAxis.mAxisLabelModulus = (int) Math
                .ceil((mData.getXValCount() * mXAxis.mLabelHeight)
                        / (mViewPortHandler.contentHeight() * values[Matrix.MSCALE_Y]));

        if (mXAxis.mAxisLabelModulus < 1)
            mXAxis.mAxisLabelModulus = 1;
    }

    @Override
    public RectF getBarBounds(BarEntry e) {

        BarDataSet set = mData.getDataSetForEntry(e);

        if (set == null)
            return null;

        float barspace = set.getBarSpace();
        float y = e.getVal();
        float x = e.getXIndex();

        float spaceHalf = barspace / 2f;

        float top = x - 0.5f + spaceHalf;
        float bottom = x + 0.5f - spaceHalf;
        float left = y >= 0 ? y : 0;
        float right = y <= 0 ? y : 0;

        RectF bounds = new RectF(left, top, right, bottom);

        getTransformer(set.getAxisDependency()).rectValueToPixel(bounds);

        return bounds;
    }

    @Override
    public PointF getPosition(Entry e, AxisDependency axis) {

        if (e == null)
            return null;

        float[] vals = new float[] {
                e.getVal(), e.getXIndex()
        };

        getTransformer(axis).pointValuesToPixel(vals);

        return new PointF(vals[0], vals[1]);
    }

    /**
     * Returns the Highlight object (contains x-index and DataSet index) of the
     * selected value at the given touch point inside the BarChart.
     * 
     * @param x
     * @param y
     * @return
     */
    @Override
    public Highlight getHighlightByTouchPoint(float x, float y) {

        if (mDataNotSet || mData == null) {
            Log.e(LOG_TAG, "Can't select by touch. No data set.");
            return null;
        }

        // create an array of the touch-point
        float[] pts = new float[2];
        pts[0] = x;
        pts[1] = y;

        mLeftAxisTransformer.pixelsToValue(pts);

        if (pts[1] < mXChartMin || pts[1] > mXChartMax)
            return null;

        return getHighlight(pts[1], pts[0]);
    }
}