算法 3d 轨道相机控制与鼠标拖动 [英] Algorithm 3d orbiting camera control with mouse drag

问题描述

请帮忙，

我找不到关于此的详细解释，这不是特定于语言的，也不是依赖于库的，因为出于某种原因我想自己控制数学.

I couldn't find detailed explanation about this which is not language specific and not library dependent, because I want to control the math myself for some reason.

如何使用鼠标创建轨道相机控件，例如在 Google SketchUp 中单击鼠标中键拖动?

How to create orbiting camera control with mouse, like middle-click drag in Google SketchUp?

_{* 在 Google SketchUp 中，相机可以通过拖动鼠标在平面中间(不始终为 0,0,0)以圆形轨道移动假想对象.它可以水平、垂直、甚至对角、所有方向运行.}

_{* In Google SketchUp, the camera can move circularly orbiting imaginary object in the middle of the plane (not always 0,0,0) by dragging the mouse. It can orbit horizontally, vertically, even diagonally, all directions.}

推荐答案

最简单的解决方案是存储 X/Y 方向角度并最终存储缩放级别.然后，您在某个 MouseMove 事件中修改角度，并使用它们来计算相机方向.

The simplest solution is to store X/Y direction angles and eventually a zoom level. Then, you modify the angles in some MouseMove event, and use them to compute camera direction.

这是一些鼠标拖动的伪代码:

Here's some pseudo-code for mouse drags:

OnMouseDown:
    mouseDragging = true;
    lastX = mouse.x;
    lastY = mouse.y;

OnMouseUp:
    mouseDragging = false;

OnMouseMove:
    if( mouseDragging ) {
        angleX += (mouse.x-lastX) * speedX;
        angleY += (mouse.y-lastY) * speedY;
    }

OnMouseWheel:
    zoom += mouse.wheelDelta;

根据这些数据，您可以构建相机位置.我不知道你用什么来做这个，但这里有一个来自 OpenGL 的例子:

Given those data you can build a camera position. I don't know what are you using for this but here's an example from OpenGL:

glLoadIdentity();
glTranslatef( 0.0f, 0.0f, -zoom );
glRotatef( angleY, 1.0f, 0.0f, 0.0f );
glRotatef( angleX, 0.0f, 1.0f, 0.0f );
glTranslatef( -orbitCenterX, -orbitCenterY, -orbitCenterZ );

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