function down (x, y, shift) {
state.dragging = true
mouseToSphere(x, y, state.clickPos)
Quat.set(state.clickRot, state.currRot)
updateCamera()
if (shift) {
Vec2.set2(state.clickPosWindow, x, y)
Vec3.set(state.clickTarget, state.camera.target)
const targetInViewSpace = Vec3.multMat4(Vec3.copy(state.clickTarget), state.camera.viewMatrix)
state.panPlane = [targetInViewSpace, [0, 0, 1]]
Ray.hitTestPlane(
getViewRay(state.camera, state.clickPosWindow[0], state.clickPosWindow[1], state.width, state.height),
state.panPlane[0],
state.panPlane[1],
state.clickPosPlane
)
Ray.hitTestPlane(
getViewRay(state.camera, state.dragPosWindow[0], state.dragPosWindow[1], state.width, state.height),
state.panPlane[0],
state.panPlane[1],
state.dragPosPlane
)
} else {
state.panPlane = null
}
}
function move (x, y, shift) {
if (!state.dragging) {
return
}
if (shift && state.panPlane) {
Vec2.set2(state.dragPosWindow, x, y)
Ray.hitTestPlane(
getViewRay(state.camera, state.clickPosWindow[0], state.clickPosWindow[1], state.width, state.height),
state.panPlane[0],
state.panPlane[1],
state.clickPosPlane
)
Ray.hitTestPlane(
getViewRay(state.camera, state.dragPosWindow[0], state.dragPosWindow[1], state.width, state.height),
state.panPlane[0],
state.panPlane[1],
state.dragPosPlane
)
Mat4.set(state.invViewMatrix, state.camera.viewMatrix)
Mat4.invert(state.invViewMatrix)
Vec3.multMat4(Vec3.set(state.clickPosWorld, state.clickPosPlane), state.invViewMatrix)
Vec3.multMat4(Vec3.set(state.dragPosWorld, state.dragPosPlane), state.invViewMatrix)
const diffWorld = Vec3.sub(Vec3.copy(state.dragPosWorld), state.clickPosWorld)
const target = Vec3.sub(Vec3.copy(state.clickTarget), diffWorld)
state.camera({ target: target })
} else {
mouseToSphere(x, y, state.dragPos)
Vec3.set(state.rotAxis, state.clickPos)
Vec3.cross(state.rotAxis, state.dragPos)
const theta = Vec3.dot(state.clickPos, state.dragPos)
Quat.set4(state.dragRot, state.rotAxis[0], state.rotAxis[1], state.rotAxis[2], theta)
Quat.set(state.currRot, state.dragRot)
Quat.mult(state.currRot, state.clickRot)
updateCamera()
}
}