0
在我MapView
,只要你想和点得到由一条线连接,但我不想作出任何行我给点击地图上创造尽可能多的点的能力是可与另一条线相交地图这样获取从地图上画出一条直线上的坐标
上有反正让行的坐标来检查新线将与他人的一个相交?
或者,如果任何人有关于如何检查这一点,将是巨大的任何建议太
这是绘制线条
@Override
public void draw(final Canvas canvas, final MapView mapView, final boolean shadow){
super.draw(canvas, mapView, shadow);
try{
Paint paint = new Paint();
paint.setAntiAlias(true);
paint.setDither(true);
paint.setColor(Color.RED);
paint.setStrokeWidth(3);
paint.setAlpha(100);
paint.setStyle(Style.STROKE);
Path path = new Path();
Point point1 = null;
boolean runOnce = false;
for(int i = 0;i<items.size();i++){
Point point = new Point();
mapView.getProjection().toPixels(items.get(i).mGeoPoint, point);
if(!runOnce)
{
path.moveTo(point.x, point.y);
point1 = new Point(point.x, point.y);
runOnce = true;
}
else
{
path.lineTo(point.x, point.y);
}
}
path.lineTo(point1.x, point1.y);
canvas.drawPath(path, paint);
path.lineTo(point1.x, point1.y);
canvas.drawPath(path, paint);
Paint paint2 = new Paint();
paint2.setAntiAlias(true);
paint2.setDither(true);
paint2.setColor(Color.RED);
paint2.setStrokeWidth(3);
paint2.setAlpha(20);
paint2.setStyle(Style.FILL);
Path path2 = new Path();
Point point2 = null;
boolean runOnce2 = false;
for(int i = 0; i < items.size(); i++)
{
Point point = new Point();
mapView.getProjection().toPixels(items.get(i).mGeoPoint, point);
if(!runOnce2)
{
path2.moveTo(point.x, point.y);
point2 = new Point(point.x, point.y);
runOnce2 = true;
}
else
{
path2.lineTo(point.x, point.y);
}
}
path2.lineTo(point2.x, point2.y);
canvas.drawPath(path2, paint2);
}catch(Exception e){
}
}
http://paulbourke.net/geometry/lineline2d/ – tiguchi 2012-07-09 15:39:54
不会工作,因为它将考虑连接端点作为相交 – tyczj 2012-07-09 20:17:45
你基本上是问如何计算两个线段之间的交点。终点当然是线段的一部分。这可以通过数学轻松解决。如果您不希望您的终点计为交叉点,那么只需检查您的终点是否重叠。这可以通过if语句解决,如下所示:if(Math.abs(x1 - x2)
tiguchi
2012-07-09 20:36:02