68 lines
2.2 KiB
Plaintext
68 lines
2.2 KiB
Plaintext
|
// Copyright 2017 The NXT Authors
|
||
|
|
//
|
||
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
||
|
|
// you may not use this file except in compliance with the License.
|
||
|
|
// You may obtain a copy of the License at
|
||
|
|
//
|
||
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
||
|
|
//
|
||
|
|
// Unless required by applicable law or agreed to in writing, software
|
||
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
||
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||
|
|
// See the License for the specific language governing permissions and
|
||
|
|
// limitations under the License.
|
||
|
|
|
||
|
|
class Camera {
|
||
|
|
public:
|
||
|
|
Camera()
|
||
|
|
: _azimuth(glm::radians(45.f)),
|
||
|
|
_altitude(glm::radians(30.f)),
|
||
|
|
_radius(10.f),
|
||
|
|
_center(0, 0, 0),
|
||
|
|
_dirty(true) {
|
||
|
|
recalculate();
|
||
|
|
}
|
||
|
|
|
||
|
|
void rotate(float dAzimuth, float dAltitude) {
|
||
|
|
_dirty = true;
|
||
|
|
_azimuth = glm::mod(_azimuth + dAzimuth, glm::radians(360.f));
|
||
|
|
_altitude = glm::clamp(_altitude + dAltitude, glm::radians(-89.f), glm::radians(89.f));
|
||
|
|
}
|
||
|
|
|
||
|
|
void pan(float dX, float dY) {
|
||
|
|
recalculate();
|
||
|
|
glm::vec3 vX = glm::normalize(glm::cross(-_eyeDir, glm::vec3(0, 1, 0)));
|
||
|
|
glm::vec3 vY = glm::normalize(glm::cross(_eyeDir, vX));
|
||
|
|
_center += vX * dX * _radius + vY * dY * _radius;
|
||
|
|
}
|
||
|
|
|
||
|
|
void zoom(float factor) {
|
||
|
|
_dirty = true;
|
||
|
|
_radius = _radius * glm::exp(-factor);
|
||
|
|
}
|
||
|
|
|
||
|
|
glm::mat4 view() {
|
||
|
|
if (_dirty) {
|
||
|
|
recalculate();
|
||
|
|
}
|
||
|
|
return _view;
|
||
|
|
}
|
||
|
|
private:
|
||
|
|
void recalculate() {
|
||
|
|
glm::vec4 eye4 = glm::vec4(1, 0, 0, 1);
|
||
|
|
eye4 = glm::rotate(glm::mat4(), _altitude, glm::vec3(0, 0, 1)) * eye4;
|
||
|
|
eye4 = glm::rotate(glm::mat4(), _azimuth, glm::vec3(0, 1, 0)) * eye4;
|
||
|
|
_eyeDir = glm::vec3(eye4);
|
||
|
|
|
||
|
|
_view = glm::lookAt(_center + _eyeDir * _radius, _center, glm::vec3(0, 1, 0));
|
||
|
|
_dirty = false;
|
||
|
|
}
|
||
|
|
float _azimuth;
|
||
|
|
float _altitude;
|
||
|
|
float _radius;
|
||
|
|
glm::vec3 _center;
|
||
|
|
glm::vec3 _eyeDir;
|
||
|
|
bool _dirty;
|
||
|
|
glm::mat4 _view;
|
||
|
|
};
|