DataRenderer.java

package com.github.mikephil.charting.renderer;

import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.Align;
import android.graphics.Paint.Style;

import com.github.mikephil.charting.animation.ChartAnimator;
import com.github.mikephil.charting.data.DataSet;
import com.github.mikephil.charting.utils.Highlight;
import com.github.mikephil.charting.utils.Utils;
import com.github.mikephil.charting.utils.ViewPortHandler;

public abstract class DataRenderer extends Renderer {

    protected ChartAnimator mAnimator;

    /** main paint object used for rendering */
    protected Paint mRenderPaint;

    /** paint used for highlighting values */
    protected Paint mHighlightPaint;

    protected Paint mDrawPaint;

    /**
     * paint object for drawing values (text representing values of chart
     * entries)
     */
    protected Paint mValuePaint;

    public DataRenderer(ChartAnimator animator, ViewPortHandler viewPortHandler) {
        super(viewPortHandler);
        this.mAnimator = animator;

        mRenderPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        mRenderPaint.setStyle(Style.FILL);

        mDrawPaint = new Paint(Paint.DITHER_FLAG);

        mValuePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        mValuePaint.setColor(Color.rgb(63, 63, 63));
        mValuePaint.setTextAlign(Align.CENTER);
        mValuePaint.setTextSize(Utils.convertDpToPixel(9f));

        mHighlightPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        mHighlightPaint.setStyle(Style.STROKE);
        mHighlightPaint.setStrokeWidth(2f);
        mHighlightPaint.setColor(Color.rgb(255, 187, 115));
    }

    /**
     * Returns the Paint object this renderer uses for drawing the values
     * (value-text).
     * 
     * @return
     */
    public Paint getPaintValues() {
        return mValuePaint;
    }

    /**
     * Returns the Paint object this renderer uses for drawing highlight
     * indicators.
     * 
     * @return
     */
    public Paint getPaintHighlight() {
        return mHighlightPaint;
    }

    /**
     * Returns the Paint object used for rendering.
     * 
     * @return
     */
    public Paint getPaintRender() {
        return mRenderPaint;
    }

    /**
     * Applies the required styling (provided by the DataSet) to the value-paint
     * object.
     * 
     * @param set
     */
    protected void applyValueTextStyle(DataSet<?> set) {

        mValuePaint.setColor(set.getValueTextColor());
        mValuePaint.setTypeface(set.getValueTypeface());
        mValuePaint.setTextSize(set.getValueTextSize());
    }

    public abstract void initBuffers();

    public abstract void drawData(Canvas c);

    public abstract void drawValues(Canvas c);

    public abstract void drawExtras(Canvas c);

    public abstract void drawHighlighted(Canvas c, Highlight[] indices);
}