java - 如何将波形(用正弦波制成)从图片顶部移动到底部？

Question

我试图将波浪画到海面上，但我不知道如何将它们从上到下移动。无论我做什么改变，它们都停留在图片的顶部。这是我用来绘制波浪的代码:

Dimension d = getSize();
        int x, y, winWidth = d.width, winHeight = d.height;
        int halfHeight = 10;
        int lastX = 0, lastY = halfHeight;
        double trajectory = 2 * Math.PI;
        double factor = trajectory / 100;

        for (x = 1; x <= winWidth; x++) {
            double sine = Math.sin (x * factor) * halfHeight;
            y = halfHeight - (int)sine;
            graafika.drawLine (x, y, lastX, lastY);
            lastX = x; lastY = y;
        }

这是一张图片，它目前的样子。

感谢您的帮助!

Answer 1

使用高度？

graafika.drawLine (x, y+winHeight-20, lastX, lastY+winHeight-20);