// per-frame mouse input; called from Update
unsafe void ProcessMouse()
{
// get modifiers
bool alt = Input.GetKey(KeyCode.LeftAlt) || Input.GetKey(KeyCode.RightAlt);
bool shift = Input.GetKey(KeyCode.LeftShift) || Input.GetKey(KeyCode.RightShift);
bool control = Input.GetKey(KeyCode.LeftControl) || Input.GetKey(KeyCode.RightControl);
// get button pressed, swap left-right on alt
int buttonpressed = 0;
if (Input.GetMouseButton(0)) // left
{
buttonpressed = (alt ? 2 : 1);
}
if (Input.GetMouseButton(1)) // right
{
buttonpressed = (alt ? 1 : 2);
}
if (Input.GetMouseButton(2)) // middle
{
buttonpressed = 3;
}
// get button click, swap left-right on alt
int buttonclick = 0;
if (Input.GetMouseButtonDown(0)) // left
{
buttonclick = (alt ? 2 : 1);
}
if (Input.GetMouseButtonDown(1)) // right
{
buttonclick = (alt ? 1 : 2);
}
if (Input.GetMouseButtonDown(2)) // middle
{
buttonclick = 3;
}
// click
if (buttonclick > 0)
{
// set perturbation state
int newstate = 0;
if (control)
{
// determine new perturbation state
if (buttonclick == 1)
{
newstate = 2; // rotate
}
else if (buttonclick == 2)
{
newstate = 1; // move
}
// get old perturbation state
MJP.TPerturb current;
MJP.GetPerturb(¤t);
// syncronize if starting perturbation now
if (newstate > 0 && current.active == 0)
{
MJP.PerturbSynchronize();
}
}
MJP.PerturbActive(newstate);
// process double-click
if (buttonclick == lastbutton && Time.fixedUnscaledTime - lasttime < 0.25)
{
// relative screen position and aspect ratio
float relx = Input.mousePosition.x / Screen.width;
float rely = Input.mousePosition.y / Screen.height;
float aspect = (float)Screen.width / (float)Screen.height;
// left: select body
if (buttonclick == 1)
{
MJP.PerturbSelect(relx, rely, aspect);
}
// right: set lookat
else if (buttonclick == 2)
{
MJP.CameraLookAt(relx, rely, aspect);
}
}
// save mouse state
lastx = Input.mousePosition.x;
lasty = Input.mousePosition.y;
lasttime = Time.fixedUnscaledTime;
lastbutton = buttonclick;
}
// left or right drag: manipulate camera or perturb
if (buttonpressed == 1 || buttonpressed == 2)
{
// compute relative displacement and modifier
float reldx = (Input.mousePosition.x - lastx) / Screen.height;
float reldy = (Input.mousePosition.y - lasty) / Screen.height;
int modifier = (shift ? 1 : 0);
// perturb
if (control)
{
if (buttonpressed == 1)
{
MJP.PerturbRotate(reldx, -reldy, modifier);
}
else
{
MJP.PerturbMove(reldx, -reldy, modifier);
}
}
// camera
else
{
if (buttonpressed == 1)
{
MJP.CameraRotate(reldx, -reldy);
}
else
{
MJP.CameraMove(reldx, -reldy, modifier);
}
}
}
// middle drag: zoom camera
if (buttonpressed == 3)
{
float reldy = (Input.mousePosition.y - lasty) / Screen.height;
MJP.CameraZoom(-reldy);
}
// scroll: zoom camera
if (Input.mouseScrollDelta.y != 0)
{
MJP.CameraZoom(-0.05f * Input.mouseScrollDelta.y);
}
// save position
lastx = Input.mousePosition.x;
lasty = Input.mousePosition.y;
// release left or right: stop perturb
if (Input.GetMouseButtonUp(0) || Input.GetMouseButtonUp(1))
{
MJP.PerturbActive(0);
}
}