WeeklyDayCalorieBarView.java

package com.enquos.nutrition.dashboard;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.view.View;

/**
 * Created on 08/03/16.
 */
public class WeeklyDayCalorieBarView extends View {

    private Paint calorieBarPaint;
    private Paint overflowPaint;

    private int calorieBarColor = Color.RED;
    private int overflowColor = Color.BLUE;

    private float calories;
    private float overflow;


    public static final float CALORIE_TO_PIXEL_RATIO = 0.1f;
    private float scaleFactor;

    /**
     * Direction of the bar
     */
    public enum DIRECTION{
        UP,DOWN
    }

    private DIRECTION direction = DIRECTION.UP;

    public WeeklyDayCalorieBarView(Context context) {
        super(context);
        initialise();
    }

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

    public WeeklyDayCalorieBarView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        initialise();
    }

    public WeeklyDayCalorieBarView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
        initialise();
    }

    private void initialise() {
        calorieBarPaint = new Paint();
        overflowPaint = new Paint();

        calorieBarPaint.setColor(calorieBarColor);
        overflowPaint.setColor(overflowColor);

        DisplayMetrics metrics = getResources().getDisplayMetrics();
        scaleFactor = metrics.density;
    }



    protected void onDraw(Canvas canvas) {
        //super.onDraw(canvas);
        int fullWidth = getWidth();
        int fullHeight = getHeight();

        //move to setter?
        float calorieBarHeight= CALORIE_TO_PIXEL_RATIO * calories;
        float overflowBarHeight = CALORIE_TO_PIXEL_RATIO * overflow;

        //direction determins where to start drawing top up or bottom

        //assume

        //draw first block
        if(calorieBarHeight!=0f) {
            canvas.drawRect(0,calorieBarHeight,fullWidth,fullHeight , calorieBarPaint);
        }

        //draw 2nd block on top
        if(overflowBarHeight!=0f) {
            canvas.drawRect(0,calorieBarHeight+overflowBarHeight,fullWidth, calorieBarHeight, overflowPaint);
        }
    }


    public DIRECTION getDirection() {
        return direction;
    }

    public void setDirection(DIRECTION direction) {
        this.direction = direction;
    }

    public float getCalories() {
        return calories;
    }

    public float getOverflow() {
        return overflow;
    }

    public void setCaloriesAndOverflow(float calories, float overflow) {
        this.calories = calories;
        this.overflow = overflow;
        invalidate();
    }


}