如何使用x，y坐标列表绘制曲线线(峰) [英] How to Drawing a curve line(peaks) using list of x,y coordinates

问题描述

我有一个打印的x，y点列表，显示不均匀的峰曲线.

I have a list of x,y points which printed,display an uneven peak curve line.

上面的图像是通过仅在Java paint组件上绘制点而生成的.我使用以下方法将它们绘制在绘制组件上.

The above image was generated by just painting the points on a java paint component. I used the following way to paint them on a paint component.

g.drawline(pointX,pointY,pointX,pointY)

是否有更好的方法绘制这种波浪线?我检查了一些类似的问题，通常它们需要打印曲线或峰，但我的线并非总是峰，因为有时它的平面变平，而有时又很奇怪.

Are there better ways to paint such wave line? I checked some of the similar questions,often they need to print a curve or peak,but my line is not always a peak as some times its flats out and other times they are bizarre.

推荐答案

使用java.awt.Graphics绘制折线的最简单方法是使用drawPolyline方法.它要求您将x和y坐标存储在单独的int[]数组中，但是比单独绘制每个线段要快得多，而且更清晰.

The simplest way to draw polylines with java.awt.Graphics is to use the drawPolyline method. It requires you to have your x and y coordinates stored in separate int[] arrays, but it is much faster and clearer than to draw each line segment individually.

如果需要浮点坐标，最好的方法是使用 Shape 对象与Graphics2D.不幸的是，Java似乎没有提供折线Shape实现，但是您可以轻松地使用

If you need floating-point coordinates, the best way would be to use a Shape object with Graphics2D. Unfortunately, Java does not seem to provide a polyline Shape implementation, but you can easily use Path2D:

Graphics2D graphics = /* your graphics object */;
double[] x = /* x coordinates of polyline */;
double[] y = /* y coordinates of polyline */;

Path2D polyline = new Path2D.Double();
polyline.moveTo(x[0], y[0]);
for (int i = 1; i < x.length; i++) {
    polyline.lineTo(x[i], y[i]);
}

graphics.draw(polyline);

通过这种方式，您也可以轻松地变换坐标-但是，当然，变换视图可能更有效.

This way allows you to easily transform you coordinates, too -- however, it may be more efficient to transform the view, of course.

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