Java Line.getStartY方法代碼示例

import javafx.scene.shape.Line; //導入方法依賴的package包/類
private double distanceToLine(Line l, double pointX, double pointY){
    double y1 = l.getStartY();
    double y2 = l.getEndY();
    double x1 = l.getStartX();
    double x2 = l.getEndX();

    double px = x2-x1;
    double py = y2-y1;

    double something = px*px + py*py;

    double u =  ((pointX - x1) * px + (pointY - y1) * py) / something;

    if (u > 1){
        u = 1;
    }
    else if (u < 0){
        u = 0;
    }

    double x = x1 + u * px;
    double y = y1 + u * py;

    double dx = x - pointX;
    double dy = y - pointY;

    double dist = Math.sqrt(dx*dx + dy*dy);

    return dist;

}
 

import javafx.scene.shape.Line; //導入方法依賴的package包/類
private Transition create(Line line, double startX, double startY, double endX, double endY) {
    double currentStartX = line.getStartX();
    double currentStartY = line.getStartY();
    double currentEndX = line.getEndX();
    double currentEndY = line.getEndY();

    return createAnimation(frac -> {
        line.setStartX(currentStartX + (startX - currentStartX) * frac);
        line.setStartY(currentStartY + (startY - currentStartY) * frac);
        line.setEndX(currentEndX + (endX - currentEndX) * frac);
        line.setEndY(currentEndY + (endY - currentEndY) * frac);
    });
}
 

import javafx.scene.shape.Line; //導入方法依賴的package包/類
static double minDistance(Wrap relativeWrap, Line line, Wrap wrap) {
    Point p1 = new Point(line.getStartX(), line.getStartY());
    Point p2 = new Point(line.getEndX(), line.getEndY());
    Point p3 = getRectangleSideCenter(wrap.getScreenBounds(), Side.LEFT);
    p3.translate(-relativeWrap.getScreenBounds().x, -relativeWrap.getScreenBounds().y);
    Point p4 = getRectangleSideCenter(wrap.getScreenBounds(), Side.RIGHT);
    p4.translate(-relativeWrap.getScreenBounds().x, -relativeWrap.getScreenBounds().y);
    return Math.min(Math.min(distance(p1, p3), distance(p1, p4)), Math.min(distance(p2, p3), distance(p2, p4)));
}
 

import javafx.scene.shape.Line; //導入方法依賴的package包/類
static String getLineDescription(Line line) {
    if (line == null) {
        return "null";
    } else {
        return "Line : startX " + line.getStartX() + " startY " + line.getStartY() + " endX " + line.getEndX() + " endY " + line.getEndY();
    }
}
 

import javafx.scene.shape.Line; //導入方法依賴的package包/類
private void handlePaddleHit(Line leftPaddleLine, Line rightPaddleLine, boolean leftHit) {
    Line paddleLine = rightPaddleLine;
    int degreesToAdd = 0;

    if (leftHit) {
        paddleLine = leftPaddleLine;
        degreesToAdd = 180;
    }

    double offsetY = paddleLine.getStartY();

    double paddleBot = paddleLine.getEndY() - offsetY;

    final double ballCoordWithinPaddle = ball.getCenterY() - offsetY;

    //should be a float number between -1 - 1
    double normalizedBallPosOnPaddle = (ballCoordWithinPaddle / paddleBot) * 2 - 1;
    if (Math.abs(normalizedBallPosOnPaddle) > 1) {
        // Print error if not between -1 and 1
        //System.err.println("should be between -1 and 1: " + normalizedBallPosOnPaddle);
    }

    double degreeOnUnitCircle = normalizedBallPosOnPaddle * 70 + degreesToAdd;

    Vector2D vectorToAdd = new Vector2D(Math.cos(degreeOnUnitCircle),Math.sin(degreeOnUnitCircle));
    ball.setDirection(new Vector2D(-ball.getDirection().getX(), ball.getDirection().getY()));
    //ball.getDirection().add(vectorToAdd).normalize();

    ball.setSpeed(ball.getSpeed() + 0.01);
}
 

import javafx.scene.shape.Line; //導入方法依賴的package包/類
@Override // Override the start method in the Application class
public void start(Stage primaryStage) {
	// Create a pane
	Pane pane = new Pane();

	// Create two circles
	Circle circle1 = new Circle(Math.random() * 201, Math.random() * 201, 15);
	Circle circle2 = new Circle(Math.random() * 201, Math.random() * 201, 15);

	// Create a line
	Line line = new Line(circle1.getCenterX(), circle1.getCenterY(),
		circle2.getCenterX(), circle2.getCenterY());

	// Calculate distane between the two centers of the circles
	double distance = Math.sqrt(Math.pow(line.getEndX() - line.getStartX(), 2)
		+ Math.pow(line.getEndY() - line.getStartY(), 2));

	// Create a text
	double x = (line.getStartX() + line.getEndX()) / 2;
	double y = (line.getStartY() + line.getEndY()) / 2;
	Text text = new Text(x, y, String.valueOf(distance));
	
	// Add nodes to pane
	pane.getChildren().addAll(circle1, circle2, line, text);

	// Create a scene and place it in the stage
	Scene scene = new Scene(pane);
	primaryStage.setTitle("Exercise_14_21"); // Set the stage title 
	primaryStage.setScene(scene); // Place the scene in the stage
	primaryStage.show(); // Display the stage
}
 

import javafx.scene.shape.Line; //導入方法依賴的package包/類
private double getPositionInYAxis(CustomAxis axis, Line axisLine, double value) {

		double yAxisMin = axis.getMinValue();
		double yAxisMax = axis.getMaxValue();

		double maxValue = yAxisMax - yAxisMin;
		value = value - yAxisMin;

		double percentage = value / maxValue;
		double width = axisLine.getEndY() - axisLine.getStartY();

		return axisLine.getStartY() + width * percentage;

	}
 

import javafx.scene.shape.Line; //導入方法依賴的package包/類
/**
 * Evaluated starting from Ox axis in clockwise direction.
 *
 * @param line
 * @return angle in grads
 */
static double getLineAngle(Line line) {
    double OY = line.getEndY() - line.getStartY();
    double OX = line.getEndX() - line.getStartX();
    return Math.atan(-OY / OX) / Math.PI * 180 + (OX < 0 ? 180 : 0);
}