我有一个正交相机,想实现对特定点的缩放功能。也就是说,想象你有一张照片,并想放大到照片的特定部分。
我知道如何放大,问题是把相机移到一个有所需区域的位置。
我该怎么做?
摄影机的orthographicSize
是视口上半部分的世界空间单位数。如果是0.5,则1个单位的立方体将完全填充视口(垂直)。
因此,要放大目标区域,请将相机放在其中心(通过将(x,y)设置为目标的中心),并将orthographicSize
设置为区域高度的一半。
下面是一个将对象居中并缩放到对象范围的示例。(用LMB缩放;"R"重置。)
public class OrthographicZoom : MonoBehaviour
{
private Vector3 defaultCenter;
private float defaultHeight; // height of orthographic viewport in world units
private void Start()
{
defaultCenter = camera.transform.position;
defaultHeight = 2f*camera.orthographicSize;
}
private void Update()
{
if (Input.GetMouseButtonDown(0))
{
Collider target = GetTarget();
if(target != null)
OrthoZoom(target.bounds.center, target.bounds.size.y); // Could directly set orthographicSize = bounds.extents.y
}
if (Input.GetKeyDown(KeyCode.R))
OrthoZoom(defaultCenter, defaultHeight);
}
private void OrthoZoom(Vector2 center, float regionHeight)
{
camera.transform.position = new Vector3(center.x, center.y, defaultCenter.z);
camera.orthographicSize = regionHeight/2f;
}
private Collider GetTarget()
{
var hit = new RaycastHit();
Physics.Raycast(camera.ScreenPointToRay(Input.mousePosition), out hit);
return hit.collider;
}
}
希望您能发现这个代码示例很有用,应该是一个复制/粘贴。注意:此脚本假定它附加到摄影机对象,否则您应该调整到摄影机对象引用的变换。
private float lastZoomDistance = float.PositiveInfinity; // remember that this should be reset to infinite on touch end
private float maxZoomOut = 200;
private float maxZoomIn = 50;
private float zoomSpeed = 2;
void Update() {
if (Input.touchCount >= 2) {
Vector2 touch0, touch1;
float distance;
Vector2 pos = new Vector2(transform.position.x, transform.position.y);
touch0 = Input.GetTouch(0).position - pos;
touch1 = Input.GetTouch(1).position - pos;
zoomCenter = (touch0 + touch1) / 2;
distance = Vector2.Distance(touch0, touch1);
if(lastZoomDistance == float.PositiveInfinity) {
lastZoomDistance = distance;
} else {
if(distance > lastZoomDistance && camera.orthographicSize + zoomSpeed <= maxZoomOut) {
this.camera.orthographicSize = this.camera.orthographicSize + zoomSpeed;
// Assuming script is attached to camera - otherwise, change the transform.position to the camera object
transform.position = Vector3.Lerp(transform.position, zoomCenter, Time.deltaTime);
} else if(distance < lastZoomDistance && camera.orthographicSize - zoomSpeed >= maxZoomIn) {
this.camera.orthographicSize = this.camera.orthographicSize - zoomSpeed;
transform.position = Vector3.Lerp(transform.position, zoomCenter, Time.deltaTime);
}
}
lastZoomDistance = distance;
}
}