public void MouseMove(int x, int y)
{
if (this.mouseDownFlag)
{
IViewCamera camera = this.Camera;
if (camera == null) { return; }
vec3 back = this.back;
vec3 right = this.right;
vec3 up = this.up;
Size bound = this.bound;
Point downPosition = this.downPosition;
{
float deltaX = -horizontalRotationFactor * (x - downPosition.X) / bound.Width;
float cos = (float)Math.Cos(deltaX);
float sin = (float)Math.Sin(deltaX);
vec3 newBack = new vec3(
back.x * cos + right.x * sin,
back.y * cos + right.y * sin,
back.z * cos + right.z * sin);
back = newBack;
right = up.VectorProduct(back);
back.Normalize();
right.Normalize();
}
{
float deltaY = verticalRotationFactor * (y - downPosition.Y) / bound.Height;
float cos = (float)Math.Cos(deltaY);
float sin = (float)Math.Sin(deltaY);
vec3 newBack = new vec3(
back.x * cos + up.x * sin,
back.y * cos + up.y * sin,
back.z * cos + up.z * sin);
back = newBack;
up = back.VectorProduct(right);
back.Normalize();
up.Normalize();
}
camera.Position = camera.Target +
back * (float)((camera.Position - camera.Target).Magnitude());
camera.UpVector = up;
this.back = back;
this.right = right;
this.up = up;
this.downPosition.X = x;
this.downPosition.Y = y;
}
}
private static void GetBackAndUp(out vec3 target2Position, out vec3 upVector, ViewTypes viewType)
{
switch (viewType)
{
case ViewTypes.UserView:
//UserView 定义为从顶视图开始，绕X 轴旋转30 度，在绕Z 轴45 度，并且能看到整个模型的虚拟模型空间。
target2Position = new vec3((float)Math.Sqrt(3), (float)Math.Sqrt(3), -1);
target2Position.Normalize();
upVector = new vec3(0, 0, -1);
break;
case ViewTypes.Top:
target2Position = new vec3(0, 0, -1);
upVector = new vec3(0, -1, 0);
break;
case ViewTypes.Bottom:
target2Position = new vec3(0, 0, 1);
upVector = new vec3(0, -1, 0);
break;
case ViewTypes.Left:
target2Position = new vec3(-1, 0, 0);
upVector = new vec3(0, 0, -1);
break;
case ViewTypes.Right:
target2Position = new vec3(1, 0, 0);
upVector = new vec3(0, 0, -1);
break;
case ViewTypes.Front:
target2Position = new vec3(0, 1, 0);
upVector = new vec3(0, 0, -1);
break;
case ViewTypes.Back:
target2Position = new vec3(0, -1, 0);
upVector = new vec3(0, 0, -1);
break;
default:
throw new NotImplementedException(string.Format("new value({0}) of EViewType is not implemented!", viewType));
//break;
}
}