import java.awt.BasicStroke;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javafx.application.Application;
import javafx.geometry.Rectangle2D;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.canvas.Canvas;
import javafx.scene.canvas.GraphicsContext;
import javafx.scene.effect.Blend;
import javafx.scene.effect.BlendMode;
import javafx.scene.effect.ImageInput;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.paint.Color;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;
import javax.imageio.ImageIO;

public class ImageDPITest extends Application {
    static boolean force;
    public static void main(String argv[]) {
        force = argv.length > 0;
        launch(argv);
    }

    @Override
    public void start(Stage stage) {
        makeImages();

        Image img1 = new Image("image1.png");
        Image img2 = new Image("image2.png");
        
        ImageView imgv1 = new ImageView(img1);
        imgv1.setTranslateX(10);
        imgv1.setTranslateY(10);
        ImageView imgv2 = new ImageView(img2);
        imgv2.setTranslateX(210);
        imgv2.setTranslateY(10);

        ImageView imgv3 = new ImageView(img1);
        imgv3.setViewport(new Rectangle2D(1, 1, 148, 98));
        imgv3.setTranslateX(411);
        imgv3.setTranslateY(11);
        ImageView imgv4 = new ImageView(img2);
        imgv4.setViewport(new Rectangle2D(1, 1, 148, 98));
        imgv4.setTranslateX(611);
        imgv4.setTranslateY(11);

        Rectangle r1 = new Rectangle(10, 160, 150, 100);
        r1.setFill(Color.rgb(255, 255, 0, 0.25));
        r1.setEffect(new Blend(BlendMode.SRC_OVER, null,
                               new ImageInput(img1, 10, 160)));
        Rectangle r2 = new Rectangle(210, 160, 150, 100);
        r2.setFill(Color.rgb(255, 255, 0, 0.25));
        r2.setEffect(new Blend(BlendMode.SRC_OVER, null,
                               new ImageInput(img2, 210, 160)));

        Canvas cv = new Canvas(800, 150);
        cv.setTranslateY(300);
        GraphicsContext gc = cv.getGraphicsContext2D();
        gc.drawImage(img1, 10, 10);
        gc.drawImage(img2, 210, 10);
        gc.drawImage(img1, 1, 1, 148, 98, 411, 11, 148, 98);
        gc.drawImage(img2, 1, 1, 148, 98, 611, 11, 148, 98);

        Group root = new Group(imgv1, imgv2, imgv3, imgv4, r1, r2, cv);
        Scene scene = new Scene(root, 800, 450);
        stage.setScene(scene);
        stage.show();
    }

    void makeImages() {
        makeImage("image1.png", "Low", 1);
        makeImage("image1@2x.png", "High", 2);
        makeImage("image2.png", "Only", 1);
    }

    void makeImage(String filename, String content, int scale) {
        File f = new File(filename);
        if (!force && f.exists()) return;
        int w = 150;
        int h = 100;
        BufferedImage bimg =
            new BufferedImage(w * scale, h * scale,
                              BufferedImage.TYPE_INT_ARGB_PRE);

        Graphics2D g2d = bimg.createGraphics();
        g2d.scale(scale, scale);
        g2d.setColor(java.awt.Color.RED);
        g2d.setStroke(new BasicStroke(2));
        g2d.drawRect(1, 1, w-2, h-2);
        g2d.setFont(new java.awt.Font("Serif", Font.BOLD, 64));
        g2d.setColor(java.awt.Color.BLUE);
        g2d.drawString(content, 10, 75);
        try {
            ImageIO.write(bimg, "png", f);
        } catch (IOException e) {
            System.out.println("error writing: "+filename);
        }
    }
}