DotsView.java

/*
 * Copyright 2014 Realm Inc.
 *
 * Licensed 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 io.realm.examples.threads.widget;

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

import io.realm.RealmResults;
import io.realm.examples.threads.model.Dot;

/**
 * Custom view that plot (x,y) coordinates from a RealmQuery
 */
public class DotsView extends View {

    // RealmResults will automatically be up to date.
    private RealmResults<Dot> results;

    private Paint circlePaint;
    private float circleRadius;
    private float pixelsPrWidth;
    private float pixelsPrHeight;


    public DotsView(Context context) {
        super(context);
        init();
    }

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

    public DotsView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init();
    }

    private void init() {
        circlePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        circlePaint.setStyle(Paint.Style.FILL);
        circlePaint.setColor(Color.RED);
        circleRadius = 10;
    }

    public void setRealmResults(RealmResults results) {
        this.results = results;
        invalidate();
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
        pixelsPrWidth = w/100f;
        pixelsPrHeight = h/100f;
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        canvas.drawColor(Color.TRANSPARENT);
        for (Dot dot : results) {
            circlePaint.setColor(dot.getColor());
            canvas.drawCircle(dot.getX()*pixelsPrWidth, dot.getY()*pixelsPrHeight, circleRadius, circlePaint);
        }
    }
}