这个问题是GPS coordinates to pixel的继续。
我需要画几个多边形。我可以单独绘制每个多边形,但不能将所有多边形都放在正确的位置。
我从此文件加载有关多边形的信息:
GPS
我有Kraj类,它代表每个多边形。
public class Kraj {
String name;
Point2D.Double points[];
Point2D.Double transPoints[];
Point2D.Double max;
Point2D.Double min;
// polygon
Path2D.Double polygon;
ArrayList<Kraj> kraje;
public Kraj(String name, Point2D.Double body[])
{
this.name = name;
this.body = Arrays.copyOf(body, body.length);
// calculate a bounding box
zjistiLimity();
this.transPoints = new Point2D.Double[points.length];
}
private void transformToWindow(int width, int height)
{
// convert to window
double convertX = width / (max.x - min.x);
double convertY = height / (max.y - min.y);
// calculate polygon to fit in window with right aspect ratio
double convert = convertX > convertY ? convertY : convertX;
// min = 0, convert to interval <0: infinity> and multiply by convert,
for (int j = 0; j < points.length; j++) {
double transX = (points[j].x - min.x) * convert;
double transY = height - (points[j].y - min.y) * convert;
transPoints[j] = new Point2D.Double(transX, transY);
}
this.polygon = new Path2D.Double();
this.polygon.moveTo(transBody[0].x, transBody[0].y);
for (int i = 1; i < body.length; i++)
this.polygon.lineTo(transPoints[i].x, transPoints[i].y);
this.polygon.closePath();
}
private void drawKraj(Graphics2D g2, int width, int height) {
g2.setStroke(new BasicStroke(2));
g2.fill(polygon);
// vykreslime obrys
g2.setColor(Color.black);
g2.draw(polygon);
}
public void draw(Graphics2D g2,
int contextWidth, int contextHeight)
{
// fit to window size
int sirkaSOdsazenim = contextWidth;
int vyskaSOdsazenim = contextHeight;
this.transformujToWindow(sirkaSOdsazenim, vyskaSOdsazenim);
this.drawKraj(g2, sirkaSOdsazenim, vyskaSOdsazenim);
}
/**
* Set min and max
*/
private void zjistiLimity() {
max = new Point2D.Double(-Double.MAX_VALUE, -Double.MAX_VALUE);
min = new Point2D.Double(Double.MAX_VALUE, Double.MAX_VALUE);
for(int j = 0; j < 10; j++)
{
for (int i = 0; i < body.length; i++)
{
if (points[i].getX() < min.getX()) min.x = points[i].getX();
if (points[i].getY() < min.getY()) min.y = points[i].getY();
if (points[i].getX() > max.getX())max.x = points[i].getX();
if (points[i].getY() > max.getY()) max.y = points[i].getY();
}
}
}
使用此代码,我可以绘制适合窗口的多边形。但是我需要绘制所有多边形以适合窗口(计算坐标以创建此地图):
我需要编辑或添加什么?感谢所有答案。
最佳答案
您可以使用以下方法转换整个多边形:
g2.translate(x, y);
g2.draw(polygon);
g2.translate(-x, -y)
为每个多边形确定适当的x / y平移是您需要做的事情。
关于java - 在正确位置绘制多边形,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/16040543/