android怎么样来检查点是我的屏幕内 [英] android how to check if a Point is inside my screen

问题描述

我得到一个Point对象把我的MapView Projectiion对象。

我有重叠的名单，我想检查，如果每个叠加是我目前的屏幕里（这是诅咒取决于缩放级别）。

我无法找到一个方法来检查，如果给定的点是在屏幕里面。

我所做的发现是，当我是从投影记录的点，这些点that're不在屏幕具有负值。

这是真的说，如果一个点有一个负值是我的屏幕外？

解决方案

 的GeoPoint yourPoint = NULL; // W / E点ü希望看到出现在屏幕上    点newPoint = NULL; // X / Y点    MapView.getProjection（）在toPixels（yourPoint，newPoint）。 //转换为XY点    INT高度= context.getResources（）getDisplayMetrics（）heightPixels。;    INT宽度= context.getResources（）getDisplayMetrics（）widthPixels。;    矩形屏幕=新的矩形（0,0，宽，高）; //矩形的重新presents屏幕    如果（screen.contains（newPoint.x，newPoint.y）{
         //你的一点是在屏幕上
    }
 

i'm getting a Point object throw my MapView Projectiion object.

I have a list of Overlays and i want to check if each Overlay is inside my current screen (which is of curse depends on the zoom level).

I couldn't find a way to check if a given point is inside the screen.

What i did found out is that when i'm Logging the Points from the Projection, the points that're not in the screen have negative value..

is it true to say that if a Point has a negative value it is outside my screen ?

解决方案

    GeoPoint yourPoint = null;// w/e point u wanna see is on the screen

    Point newPoint = null; // x/y point

    mapView.getProjection().toPixels(yourPoint, newPoint); //convert to xy Point

    int height = context.getResources().getDisplayMetrics().heightPixels;

    int width = context.getResources().getDisplayMetrics().widthPixels;

    Rect screen = new Rect(0,0,width,height); //rect that represents your Screen

    if(screen.contains(newPoint.x, newPoint.y){
         // your point is on the screen
    }

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