AngleGraph.java

package com.roboclub.robobuggy.ui;

import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;

/**
 * {@link RobobuggyGUIContainer} used to display an angular graph
 */
public class AngleGraph extends RobobuggyGUIContainer {

    private static final long serialVersionUID = 4524475337756493384L;

    private JTextField reading;
    private Graph graph;

    /**
     * Construct a new {@link AngleGraph}
     *
     * @param name name of the graph
     */
    public AngleGraph(String name) {
        reading = new JTextField("", 10);
        reading.setEditable(false);
        JLabel label = new JLabel("   " + name + ": ");
        graph = new Graph();
        this.addComponent(label, 0, 0, 1, .1);
        this.addComponent(graph, 0, .1, 1, .8);
        this.addComponent(reading, 0, .9, 1, .1);
    }

    /**
     * Update the {@link AngleGraph} with a new value
     *
     * @param angle new value to display
     */
    public void updateGraph(double angle) {
        this.graph.updateGraph(angle);
        this.reading.setText(Double.toString(angle));
    }

    /**
     * Private class used to represent a graph
     */
    private static class Graph extends JPanel {
        private static final long serialVersionUID = 6015150544448011207L;

        private int graphWidth = 200;  //200 is the default  value for the width
        private int graphHeight = 200; //200 is the default value for the height
        private int endx;
        private int endy;

        private int offset = -1;
        private int startX = -1;
        private int startY = -1;
        private double radius = -1;

        /**
         * Construct a new {@link Graph}
         */
        Graph() {
            this.setPreferredSize(new Dimension(graphWidth + 2 * offset,
                    graphHeight + 2 * offset));
        }


        private void updateDimensions() {
            this.graphWidth = (int) (this.getWidth() * .9); //TODO: get ride of magic value
            this.graphHeight = (int) (this.getHeight() * .9);//TODO: get ride of magic value
            this.startX = graphWidth / 2 + offset;
            this.startY = graphHeight / 2 + offset;
            this.endx = startX;
            this.endy = startY;
            this.offset = 10;//TODO: get ride of magic value
            this.radius = (double) graphWidth / 2;
        }

        @Override
        public void paintComponent(Graphics g) {
            updateDimensions();

            g.setColor(Color.DARK_GRAY);
            g.fillRect(0, 0, graphWidth + 2 * offset, graphHeight + 2 * offset);

            g.setColor(Color.WHITE);
            g.fillOval(offset, offset, graphWidth, graphHeight);

            g.setColor(Color.RED);
            g.drawLine(startX, startY, endx, endy);
        }

        public void updateGraph(double angle) {
            endx = startX - (int) (radius * Math.sin(Math.toRadians(angle)));
            endy = startY - (int) (radius * Math.cos(Math.toRadians(angle)));
            Gui.getInstance().fixPaint();
        }
    }
}