[英]Canvas does not draw smooth lines
在javafx画布中徒手绘制时,我无法获得anitialiazated的线。 以下是代码...
import javafx.application.*;
import javafx.event.*;
import javafx.scene.*;
import javafx.scene.canvas.*;
import javafx.scene.control.*;
import javafx.scene.input.*;
import javafx.scene.shape.*;
import javafx.stage.*;
public class Test2 extends Application {
GraphicsContext gc;
public static void main(String[] args) { launch(args); }
private class MouseDragged implements EventHandler<MouseEvent> {
public void handle( MouseEvent e ) {
gc.lineTo( e.getX(), e.getY() );
gc.stroke();
}
}
private class MousePressed implements EventHandler<MouseEvent> {
public void handle( MouseEvent e ) {
gc.moveTo( e.getX(), e.getY() );
}
}
@Override
public void start(Stage stage) {
Canvas canvas = new Canvas(500, 500);
canvas.setOnMouseDragged( new MouseDragged() );
canvas.setOnMousePressed( new MousePressed() );
gc = canvas.getGraphicsContext2D();
gc.setLineCap( StrokeLineCap.ROUND );
gc.setLineJoin( StrokeLineJoin.ROUND );
gc.setLineWidth( 0.1 );
Group root = new Group(canvas);
Scene scene = new Scene(root);
stage.setTitle("Test2");
stage.setScene(scene);
stage.show();
}
}
如果我创建一个swing应用,我可以提供渲染提示以使其平滑...
g2.setRenderingHint( RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON );
如何为画布中的图形上下文提供渲染效果?
尝试将此效果添加到您的GraphicsContext
:
BoxBlur blur = new BoxBlur();
blur.setWidth(1);
blur.setHeight(1);
blur.setIterations(1);
gc.setEffect(blur);
因此(作为示例)您的start
方法现在看起来像这样:
@Override
public void start(Stage stage) {
Canvas canvas = new Canvas(500, 500);
canvas.setOnMouseDragged( new MouseDragged() );
canvas.setOnMousePressed( new MousePressed() );
gc = canvas.getGraphicsContext2D();
gc.setLineCap( StrokeLineCap.ROUND );
gc.setLineJoin( StrokeLineJoin.ROUND );
gc.setLineWidth( 1 );
BoxBlur blur = new BoxBlur();
blur.setWidth(1);
blur.setHeight(1);
blur.setIterations(1);
gc.setEffect(blur);
Group root = new Group(canvas);
Scene scene = new Scene(root);
stage.setTitle("Test2");
stage.setScene(scene);
stage.show();
}
它并不完全完美……但是到目前为止我发现的最好的东西。
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