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/*
Copyright (C) 2009 Andrew Caudwell (acaudwell@gmail.com)
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version
3 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "zoomcamera.h"
ZoomCamera::ZoomCamera() {
}
ZoomCamera::ZoomCamera(vec3 pos, vec3 target, float min_distance, float max_distance) :
pos(pos), _pos(pos), target(target), _target(target), dest(pos), fov(90.0f) {
znear = 0.1;
up = vec3(0.0f, -1.0f, 0.0f);
setMinDistance(min_distance);
setMaxDistance(max_distance);
padding = 1.0;
speed = 1.0;
lockon = false;
lockon_time = 0.0;
reset();
}
void ZoomCamera::reset() {
pos = _pos;
target = _target;
}
float ZoomCamera::getMaxDistance() { return max_distance; }
float ZoomCamera::getMinDistance() { return min_distance; }
void ZoomCamera::setPadding(float padding) {
this->padding = padding;
}
void ZoomCamera::setMaxDistance(float max) {
max_distance = max;
zfar = max + 1.0;
}
void ZoomCamera::setMinDistance(float min) {
min_distance = min;
}
void ZoomCamera::lockOn(bool lockon) {
if(lockon) {
lockon_time = 1.0;
}
this->lockon = lockon;
}
void ZoomCamera::look() {
lookAt(target);
}
void ZoomCamera::lookAt(const vec3& target) {
gluLookAt( pos.x, pos.y, pos.z,
target.x, target.y, target.z,
up.x, up.y, up.z);
}
void ZoomCamera::focus() {
display.mode3D(fov, znear, zfar);
look();
}
void ZoomCamera::stop() {
this->dest = pos;
}
void ZoomCamera::setSpeed(float speed) {
this->speed = speed;
}
void ZoomCamera::adjust(const Bounds2D& bounds) {
adjust(bounds, true);
}
void ZoomCamera::adjust(const Bounds2D& bounds, bool adjust_distance) {
//center camera on bounds
vec2 centre = bounds.centre();
//adjust by screen ratio
dest.x = centre.x;
dest.y = centre.y;
if(!adjust_distance) return;
//scale by 10% so we dont have stuff right on the edge of the screen
float width = bounds.width() * padding;
float height = bounds.height() * padding;
float aspect_ratio = display.width / (float) display.height;
if(aspect_ratio < 1.0) {
height /= aspect_ratio;
} else {
width /= aspect_ratio;
}
//calc visible width of the opposite wall at a distance of 1 this fov
float toa = tan( fov * 0.5f * DEGREES_TO_RADIANS ) * 2.0;
float distance;
//TOA = tan = opposite/adjacent (distance = adjacent)
//use the larger side of the box
//cropping: vertical, horizontal or none
if(gGourceSettings.crop_vertical) {
distance = width / toa;
} else if (gGourceSettings.crop_horizontal) {
distance = height / toa;
} else {
if(width >= height) {
distance = width / toa;
} else {
distance = height / toa;
}
}
//debugLog("toa %.2f, distance %.2f width %.2f height %.2f dratio %.2f\n", toa, distance, width, height, dratio);
//check bounds are valid
if(distance < min_distance) distance = min_distance;
if(distance > max_distance) distance = max_distance;
this->dest.z = -distance;
}
void ZoomCamera::setDistance(float distance) {
dest.z = -distance;
}
void ZoomCamera::setPos(const vec3& pos, bool keep_angle) {
if(keep_angle) {
vec3 dir = target - this->pos;
this->pos = pos;
this->target = pos + dir;
} else {
this->pos = pos;
}
}
void ZoomCamera::logic(float dt) {
vec3 dp = (dest - pos);
vec3 dpt = dp * dt * speed;
if(lockon) {
dpt = dpt * lockon_time + dp * (1.0f-lockon_time);
if(lockon_time>0.0) {
lockon_time = std::max(0.0f, lockon_time-dt*0.5f);
}
}
if(glm::length2(dpt) > glm::length2(dp)) dpt = dp;
pos += dpt;
target = vec3(pos.x, pos.y, 0.0);
}
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