/*
 * Copyright (c) 2020 Yoshihisa Nitta
 * Released under the MIT license
 * http://opensource.org/licenses/mit-license.php
 */
import java.util.*;
import java.awt.geom.*;
import java.awt.*;
import java.awt.image.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;

public class ToyGraphics extends JComponent {
    int width, height;
    BufferedImage image;
    protected Graphics2D g2d;
    public boolean isMousePressed = false;
    public void initImage(int w,int h) {
	width = w;
	height = h;
	image = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);
	g2d = image.createGraphics();
	setFont();
	clear();
    }
    public void initFrame() {
	JFrame frame = new JFrame("Graphic Window");
	Container c = frame.getContentPane();
	Dimension size = getPreferredSize();
	int w = size.width;
	int h = size.height;
	c.setSize(w,h);
	c.add(this,BorderLayout.CENTER);
	frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	frame.pack();
	frame.setVisible(true);
    }
    public Dimension getPreferredSize() {
	return new Dimension(image.getWidth(),image.getHeight());
    }
    public ToyGraphics() { this(1280,720); }
    public ToyGraphics(int w,int h) {
	initImage(w,h);
	initFrame();
    }
    public void setFont() { setFont("Serif",24); }
    public void setFont(String name,int size) {
	g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
			     RenderingHints.VALUE_ANTIALIAS_ON);
	Font font = new Font(name,Font.PLAIN,size);
	g2d.setFont(font);
    }
    public void setColor(Color col) { g2d.setColor(col); }
    public void drawText(String txt,int x,int y) {
	g2d.drawString(txt,x,y);
    }
    public void paint(Graphics g) {
	g.drawImage(image,0,0,this);
    }
    public static int rgb2pixel(int r,int g,int b)
	throws IllegalArgumentException {
	return rgb2pixel(255,r,g,b);
    }
    public static int rgb2pixel(int a,int r,int g,int b)
	throws IllegalArgumentException {
	if (a<0 || a>255 || r<0 || r>255 || g<0 || g>255 || b<0 || b>255)
	    throw new IllegalArgumentException("bad color:("+a+","+r+","+g+","+b+")");
	return (a<<24) | (r << 16) | (g << 8) | (b);
    }
    public void drawRGB(int x,int y,int r,int g,int b) {
	setRGB(x,y,r,g,b);
	repaint(x,y,1,1);
    }
    public void drawRGB(int x,int y,int pxl) {
	setRGB(x,y,pxl);
	repaint(x,y,1,1);
    }
    public void setRGB(int x,int y,int r,int g,int b) {
	setRGB(x,y,rgb2pixel(r,g,b));
    }
    public void setRGB(int x,int y,int pxl) {
	if (x < 0 || x>width || y<0 || y>height) return;
	image.setRGB(x,y,pxl);
    }
    public void clear() {
	for (int y=0; y<height; y++) {
	    for (int x=0; x<width; x++) {
		setRGB(x,y,0,0,0);
	    }
	}
    }
    private void fillRandomColor(Random random) {
	for (int y=0; y<height; y++) {
	    for (int x=0; x<width; x++) {
		int pxl = random.nextInt() | 0xff000000;
		setRGB(x,y,pxl);
	    }
	}
    }
}