小编DSa*_*hes的帖子

我有这种方法使用canvas在JavaFX中绘制笛卡尔平面

    public class Grafics extends StackPane {

       private Canvas canvas;

           public void Grafics(){ 

            GridPane grid = new GridPane();
            grid.setPadding(new Insets(5));
            grid.setHgap(10);
            grid.setVgap(10);             

            canvas = new Canvas();
            canvas.setHeight(500);
            canvas.setWidth(700);
            GridPane.setHalignment(canvas, HPos.CENTER);
            grid.add(canvas, 0, 2);

            GraphicsContext gc = canvas.getGraphicsContext2D();
            gc.setFill(Color.BLACK);
            gc.fillRect(0, 0, canvas.getWidth(), canvas.getHeight());
            gc.setFill(Color.WHITE);
            gc.fillRect(1, 1, canvas.getWidth() - 2, canvas.getHeight() - 2);

           drawAxesXY(gc); //call the method drawAxes

           getChildren().addAll(grid);// add an gridpane in stackpane
         }



private void drawAxesXY(GraphicsContext gc1) {

            gc1 = canvas.getGraphicsContext2D().getPixelWriter();  

            PixelWriter pixelWriter = gc1.getPixelWriter();

            gc1.setFill(Color.BLACK);
            gc1.setStroke(Color.BLACK);
            gc1.setLineWidth(1.5);
            gc1.strokeText("Y", 350, …

我必须做一些projet在JavaFX中用Canvas绘制正多边形,我怀疑如何使用GraphicsContext设计一个带有canvas的圆

我有这个包含两个轴(x,y)的点类

public class Point2D {

         private float mX;
         private float mY;

         public Point2D () {
            this (0,0);
         }

         public Point2D (float x, float y) {
             mX = x;
             mY = y;
         }

        public float getX() {
           return mX;
          }

       public float getY() {
          return mY;
  }
}

我有这个圆圈类,我怀疑使方法public void drawCircle(GraphicsContext gc)

public class Circle{

    private Point2D mCenter;
    private Color color;
    private float mRadius;

public Circle (Point2D center, Color color, float radius ) {
         this.mCenter = center;
         this.color = …