package ceccs;

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.canvas.Canvas;
import javafx.scene.canvas.GraphicsContext;
import javafx.scene.control.Button;
import javafx.scene.layout.HBox;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.scene.shape.StrokeLineCap;
import javafx.stage.Stage;

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

    @Override
    public void start(Stage primaryStage) throws Exception {
        /**To draw on a canvas you need to use its Graphics Context.*/
        Canvas cancan = new Canvas(600,300);
        GraphicsContext gc = cancan.getGraphicsContext2D();

        /**buttons to draw on canvas, each runs a method on gc which is of class GraphicsContext*/
        Button b1 = new Button("Stroke Line 1");
        b1.setOnAction( event -> {
            gc.setStroke(Color.DARKMAGENTA);
            gc.setLineWidth(4.5);
            gc.setLineCap(StrokeLineCap.ROUND);
            gc.strokeLine(100,30, 550,270);
        });
        Button b2 = new Button("Random Line");
        b2.setOnAction( event -> {
            gc.setStroke(new Color(Math.random(),Math.random(),Math.random(),1));
            gc.setLineWidth(Math.random() * 9 + 1);
            gc.setLineCap(StrokeLineCap.ROUND);
            double randX1 = Math.random() * cancan.getWidth();
            double randX2 = Math.random() * cancan.getWidth();
            double randY1 = Math.random() * cancan.getHeight();
            double randY2 = Math.random() * cancan.getHeight();
            gc.strokeLine(randX1,randY1,randX2,randY2);
        });
        Button b3 = new Button("Make Background Purple");
        b3.setOnAction( event -> {
            gc.setFill(Color.PURPLE);
            gc.fillRect(0,0, cancan.getWidth(), cancan.getHeight());
        });
        Button b4 = new Button("Clear");
        b4.setOnAction( event -> {
            gc.clearRect(0,0, cancan.getWidth(), cancan.getHeight());
        });

        /** layout */
        VBox outerCol = new VBox();
        HBox buttonRow = new HBox();
        buttonRow.getChildren().addAll(b1,b2,b3,b4);
        outerCol.getChildren().addAll(cancan, buttonRow);
        Scene scn = new Scene(outerCol);
        primaryStage.setScene(scn);
        primaryStage.setTitle("JavaFX Canvas Demo");
        primaryStage.setResizable(false);
        primaryStage.show();

    }
}