Natour, O. 11/17/16 Csc-220 Koch Snowflake

/*Omar Natour
 * 11/18/16
 * Csc-220 Data Structures
 * Hw7 Koch Snowflake
 * Use recursion to make a koch snowflake in Javafx
 * Ojnatour0001@student.stcc.edu
 */

import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Node;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.TextField;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.HBox;
import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Line;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;

public class SnowFlake extends Application {
    public static void main(String[] args) {
        launch(args);
    }

    BorderPane bPane = new BorderPane();
    Scene sce = new Scene(bPane, 450, 450);
    TextField tfStatus = new TextField();
    int order = 0;
    TextField tfOrder = new TextField();

    public void start(Stage PrimaryStage) {

        bPane.setCenter(center());
        bPane.setBottom(bottom());
        bPane.setTop(top());

        PrimaryStage.setTitle("Koch Snowflake");
        PrimaryStage.setScene(sce);
        PrimaryStage.show();
        PrimaryStage.setResizable(true);
        PrimaryStage.setMinHeight(400);
        PrimaryStage.setMinWidth(400);

        sce.widthProperty().addListener(ov -> pane.paint());
        sce.heightProperty().addListener(ov -> pane.paint());

    }

    private Node bottom() {
        HBox hBox = new HBox();

        hBox.setPadding(new Insets(10, 10, 10, 10));
        hBox.setAlignment(Pos.CENTER);
        hBox.setMinHeight((25));

        tfStatus.setPromptText("Status");
        tfStatus.setEditable(false);
        tfStatus.setPrefColumnCount(20);
        tfStatus.setAlignment(Pos.CENTER);

        hBox.getChildren().add(tfStatus);
        return hBox;
    }

    SnowFlakePane pane = new SnowFlakePane();

    private Node center() {

        Rectangle rOutline = new Rectangle();

        rOutline.setFill(Color.TRANSPARENT);
        rOutline.setStroke(Color.BLACK);
        rOutline.setArcHeight(10);
        rOutline.setArcWidth(10);
        rOutline.setStrokeWidth(1);
        rOutline.heightProperty().bind(sce.widthProperty().multiply(.8));
        rOutline.widthProperty().bind(sce.widthProperty().multiply(.9));

        return pane;
    }

    private Node top() {

        HBox hBox = new HBox(5);

        Button bMinus = new Button("-");
        Button bPlus = new Button("+");

        tfOrder.setPromptText("Order of Snowflake");
        tfOrder.setPrefColumnCount(12);
        tfOrder.setAlignment(Pos.CENTER);

        bPlus.setPrefSize(55, 25);
        bMinus.setPrefSize(55, 25);

        hBox.setAlignment(Pos.CENTER);
        hBox.setPadding(new Insets(10, 10, 10, 10));

        bPlus.setOnAction(Plus);
        bMinus.setOnAction(Minus);
        tfOrder.setOnAction(Enter);

        hBox.getChildren().addAll(bMinus, tfOrder, bPlus);
        return hBox;
    }

    EventHandler<ActionEvent> Enter = e -> {
        if (tfOrder.getText().matches("^ *\\d+ *$")) {
            order = Integer.parseInt(tfOrder.getText().trim());
            tfStatus.setText("" + order);
            pane.setOrder(order);

        } else if (tfOrder.getText().matches("^ *-\\d+ *$"))
            tfStatus.setText("Error, cannot set order as a negative value.");
        else
            tfStatus.setText("Error.");
    };
    EventHandler<ActionEvent> Minus = e -> {
        if (order > 0) {
            order--;
            tfStatus.setText("" + order);
            pane.setOrder(order);
        } else {
            tfStatus.setText("Error, cannot set order as a negative value.");
        }
    };

    EventHandler<ActionEvent> Plus = e -> {
        order++;
        tfStatus.setText("" + order);
        pane.setOrder(order);
    };
}

class SnowFlakePane extends Pane {
    private int order = 0;

    private double startX0 = 0.;
    private double startX1 = 0.;
    private double startX2 = 0.;
    private double startY0 = 0.;
    private double startY1 = 0.;
    private double startY2 = 0.;

    public void setOrder(int order) {
        this.order = order;
        paint();
    }

    public void paint() {

        startX0 = (getWidth() / 6);
        startX1 = (getWidth() - getWidth() / 6);
        startX2 = (getWidth() / 2);
        startY0 = (getHeight() / 2.7
                + Math.sqrt(Math.pow(startX1 - startX0, 2) - Math.pow(((startX1 - startX0) / 2), 2)) / 2);
        startY1 = startY0;
        startY2 = startY0 - Math.sqrt(Math.pow(startX1 - startX0, 2) - Math.pow(((startX1 - startX0) / 2), 2));

        getChildren().clear();

        paintKochCurve(order, startX0, startY0, startX1, startY1);
        paintKochCurve(order, startX1, startY1, startX2, startY2);
        paintKochCurve(order, startX2, startY2, startX0, startY0);

    }

    private void paintKochCurve(int order, double x0, double y0, double x1, double y1) {
        if (order == 0)
            getChildren().add(new Line(x0, y0, x1, y1));
        else {

            double width = x1 - x0;
            double height = y1 - y0;

            double fx = width / 3 + x0;
            double fy = height / 3 + y0;
            double px = (0.5 * (x0 + x1) + Math.sqrt(3) * (y0 - y1) / 6);
            double py = (0.5 * (y0 + y1) + Math.sqrt(3) * (x1 - x0) / 6);
            double lx = (2 * width) / 3 + x0;
            double ly = (2 * height) / 3 + y0;

            paintKochCurve(order - 1, x0, y0, fx, fy);
            paintKochCurve(order - 1, fx, fy, px, py);
            paintKochCurve(order - 1, px, py, lx, ly);
            paintKochCurve(order - 1, lx, ly, x1, y1);
        }
    }

    public SnowFlakePane() {
        this.setOnMouseDragged(e -> {
            try {
                if (((Node) this.getChildren()).isVisible()) {
                    startX0 = (e.getX() / 6);
                    startX1 = (e.getX() - e.getX() / 6);
                    startX2 = (e.getX() / 2);
                    startY0 = (e.getY() - e.getY() / 2.7);
                    startY2 = startY0 - Math.sqrt(Math.pow(startX1 - startX0, 2) - Math.pow(((startX1 - startX0) / 2), 2));
                    paint();
                }
            } catch (ClassCastException e1) {
                // Just so clicking and dragging on the window does not
                // prematurely create a Koch curve.
            }
        });
    }
}