java java从点的arraylist中绘制折线
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java draw polyline from an arraylist of points
提问by trs
Is it possible to draw a polyline by passing the method an array list of Point values? something like this:
是否可以通过向方法传递点值的数组列表来绘制折线？像这样：
ArrayList<Point> projectilePoints=new ArrayList<Point>();
Projectile p = new Projectile(11, 17, 73, 37);
for (int i = 0; i < 11; i++) {
Point point = p.getPositionAt(i);
projectilePoints.add(point);
}
g.drawPolyline(projectilePoints, projectilePoints, 11);
What is the correct way to pass in the parameters of x and y points for the polyline?
为折线传入 x 和 y 点的参数的正确方法是什么？
回答by adatapost
No, there is no such method takes Arraylistof Pointreference parameter. The Syntax is,
否，不存在这样的方法需要Arraylist的Point参考参数。语法是，
Graphics.drawPolyline(int[] xPoints, int[] yPoints, int nPoints)
Graphics.drawPolyline(int[] xPoints, int[] yPoints, int nPoints)
回答by Simon C
Call method Graphics2D.drawPolyline. This method takes an int array of X coordinate values, an int array of Y coordinate values and the number of points.
调用方法Graphics2D.drawPolyline。此方法采用 X 坐标值的 int 数组、Y 坐标值的 int 数组和点数。
There is no line drawing method that takes Pointobjects, you have to create int arrays of coordinates.
没有采用Point对象的线条绘制方法，您必须创建坐标的 int 数组。
See http://download.oracle.com/javase/1,5.0/docs/api/java/awt/Graphics2D.html
见http://download.oracle.com/javase/1,5.0/docs/api/java/awt/Graphics2D.html
回答by Thomas
The JavaDpc on Graphics#drawPolyLinestates that you need to pass 2 int arrays that represent the x and y coordinates.
JavaDpc 上Graphics#drawPolyLine声明您需要传递 2 个表示 x 和 y 坐标的 int 数组。
Alternatively, you might use Graphics2d#draw(Shape)and pass a Path2Dshape, that can be prefilled using your points (e.g. by calling lineTo(x,y)for all points but the first - for which you might call moveTo(x,y)).
或者，您可以使用Graphics2d#draw(Shape)并传递一个Path2D形状，该形状可以使用您的点进行预填充（例如，通过调用lineTo(x,y)除第一个点之外的所有点 - 您可能会调用moveTo(x,y)）。
