Javaの対角線に円を描く方法は？

Question

私は画面の左下部分から画面の右上に行く対角線を持っています。今度は、左下の部分から右上に行く距離100メートルの線に円を描きたいのですが、それが私の問題です。あなたはこの問題について私にいくつかのアイデアを教えていただけますか？ここで

コードです

すべてのヘルプははるかに高く評価されるだろう...：あなたFOR部の

public void paint(Graphics g) 
{ 
    super.paint(g); 

    Graphics2D g2d = (Graphics2D) g; 
    g2d.setBackground(Color.white); 

    int x0_pixel = 0; 
    int y0_pixel = 0; 

    int x1_pixel = getWidth(); 
    int y1_pixel = getHeight(); 

    int x0_world = 0; 
    int y0_world = 0; 

    double x1_world = 2000; // meters 
    double y1_world = 1125; // meters 

    double x_ratio = (double) x1_pixel/x1_world; 
    double y_ratio = (double) y1_pixel/y1_world; 

    int xFrom = 0; 
    int yFrom = 0; 

    double xTo = x1_world; 
    double yTo = y1_world; 

    int FromX_pixel = convertToPixelX(xFrom, x_ratio); 
    int FromY_pixel = convertToPixelY(y1_pixel, yFrom, y_ratio); 

    int ToX_pixel = convertToPixelX((int) xTo, x_ratio); 
    int ToY_pixel = convertToPixelY(y1_pixel, (int) yTo, y_ratio); 

    g2d.setColor(Color.RED); 
    g2d.drawLine(FromX_pixel, FromY_pixel, ToX_pixel, ToY_pixel); 

    double theta = Math.atan(yTo/xTo); 

    double len = (int) Math.sqrt(xTo * xTo + yTo * yTo); 

    int interval = 100; 

    for (int distance = xFrom; distance < len; distance += interval) 
    { 
     double distance_x = (int) Math.cos(theta * distance); 
     double distance_y = (int) Math.sin(theta * distance); 

     int x_circle_pixel = convertToPixelCircleX(FromX_pixel, distance_x); 
     int y_circle_pixel = convertToPixelCircleY(y1_pixel, distance_y, y_ratio); 

     g2d.drawOval(x_circle_pixel, y_circle_pixel, 10, 10); 
    } 

    Toolkit.getDefaultToolkit().sync(); 
    g2d.dispose(); 

} 

private static int convertToPixelY(int y_offset, int y_world, double y_ratio) 
{ 
    return (int) (y_offset - (y_world * y_ratio)); 
} 

private static int convertToPixelX(int x_world, double ratio) 
{ 
    return (int) (x_world * ratio); 
} 

private static int convertToPixelCircleY(int y_offset, double distance, double y_ratio) 
{ 
    return (int) (y_offset - (distance * y_ratio)); 
} 

private static int convertToPixelCircleX(int x_world, double distance_x) 
{ 
    return (int) (x_world * distance_x); 
} 

Answer 1

見て、私はエラーがどこにあることだと考えています。

final double cosTheta = Math.cos(theta); 
final double sinTheta = Math.sin(theta); 

for (int distance = xFrom; distance < len; distance += interval) { 

    double distance_x = distance * cosTheta; 
    double distance_y = distance * sinTheta; 

    //int x_circle_pixel = convertToPixelCircleX(FromX_pixel, distance_x); 
    //int y_circle_pixel = convertToPixelCircleY(y1_pixel, distance_y, y_ratio); 
    int x_circle_pixel = convertToPixelX((int) distance_x, x_ratio); 
    int y_circle_pixel = convertToPixelY(y1_pixel, (int) distance_y, y_ratio); 

    g2d.drawOval(x_circle_pixel, y_circle_pixel, 10, 10); 
}