JavaFX Canvas Rendering Performance

Question

I work on a JavaFX application and have to draw a lot (4000) of arc's. I'm using the JavaFX Canvas method strokeArc of the graphic context.

The application performs very weak, but not the calls of the methods strokeArc, I think the delay occurs later, maybe at the rendering. The results is, that the application does take a delay about 5 seconds to show the arc's on the gui.

Is there a faster way to draw the arc's in JavaFX?

Answer 1

No, there isn't. Canvas is the fastest.

You didn't provide a MCVE. I just tried a simple application. Works pretty fast, 4000 arcs drawn in 6ms. The application window shows up immediately. Here's the code:

import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.canvas.Canvas;
import javafx.scene.canvas.GraphicsContext;
import javafx.scene.paint.Color;
import javafx.scene.shape.ArcType;
import javafx.stage.Stage;

public class ArcTest extends Application {

    public static void main(String[] args) {
        launch(args);
    }

    @Override
    public void start(Stage primaryStage) {

        Group root = new Group();
        Canvas canvas = new Canvas(300, 250);

        GraphicsContext gc = canvas.getGraphicsContext2D();

        root.getChildren().add(canvas);
        primaryStage.setScene(new Scene(root));
        primaryStage.show();

        drawShapes(gc);

    }

    private void drawShapes(GraphicsContext gc) {

        long time = System.currentTimeMillis();

        gc.setFill(Color.GREEN);
        gc.setStroke(Color.BLUE);
        gc.setLineWidth(5);
        for( int i=0; i < 4000; i++) {
            gc.strokeArc(10, 160, 30, 30, 45, 240, ArcType.OPEN);
        }

        System.out.println( System.currentTimeMillis() - time);
    }
}

Unless you provide some code with more information (BlendMode, etc) it's hard to help you.