private void DrawMapIcon(Vector3 worldPosition, MapIcon icon, bool keepOnMap)
{
if (!icon || !UI || !UI.gameObject)
{
return;
}
//把相机视野内的世界坐标归一化为一个裁剪正方体中的坐标，其边长为1，就是说所有视野内的坐标都变成了x、z、y分量都在(0,1)以内的裁剪坐标
Vector3 viewportPoint = MapCamera.WorldToViewportPoint(worldPosition);
//这一步用于修正UI因设备分辨率不一样，在进行缩放后实际Rect信息变了而产生的问题
Rect screenSpaceRect = ZetanUtility.GetScreenSpaceRect(UI.mapRect);
//获取四个顶点的位置，顶点序号
// 1 ┏━┓ 2
// 0 ┗━┛ 3
Vector3[] corners = new Vector3[4];
UI.mapRect.GetWorldCorners(corners);
//根据归一化的裁剪坐标，转化为相对于地图的坐标
Vector3 screenPos = new Vector3(viewportPoint.x * screenSpaceRect.width + corners[0].x, viewportPoint.y * screenSpaceRect.height + corners[0].y, 0);
Vector3 rangePos = screenPos;
if (keepOnMap)
{
//以遮罩的Rect为范围基准而不是地图的
screenSpaceRect = ZetanUtility.GetScreenSpaceRect(MapMaskRect);
float size = (screenSpaceRect.width < screenSpaceRect.height ? screenSpaceRect.width : screenSpaceRect.height) * 0.5f;//地图的一半尺寸
UI.mapWindowRect.GetWorldCorners(corners);
if (circle && !isViewingWorldMap)
{
//以下不使用UI.mapMaskRect.position，是因为该position值会受轴心(UI.mapMaskRect.pivot)位置的影响而使得最后的结果出现偏移
Vector3 realCenter = ZetanUtility.CenterBetween(corners[0], corners[2]);
Vector3 positionOffset = Vector3.ClampMagnitude(screenPos - realCenter, radius * size);
screenPos = realCenter + positionOffset;
}
else
{
float edgeSize = (isViewingWorldMap ? worldEdgeSize : this.edgeSize) * size;
screenPos.x = Mathf.Clamp(screenPos.x, corners[0].x + edgeSize, corners[2].x - edgeSize);
screenPos.y = Mathf.Clamp(screenPos.y, corners[0].y + edgeSize, corners[1].y - edgeSize);
}
}
icon.transform.position = screenPos;
if (icon.iconRange)
{
icon.iconRange.transform.position = rangePos;
}
}
