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/* Radar.cpp
Copyright (c) 2014 by Michael Zahniser
Endless Sky 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.
Endless Sky 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 <https://www.gnu.org/licenses/>.
*/
#include "Radar.h"
#include "GameData.h"
#include "shader/LineShader.h"
#include "shader/PointerShader.h"
#include "shader/RingShader.h"
#include <cmath>
using namespace std;
const int Radar::PLAYER = 0;
const int Radar::FRIENDLY = 1;
const int Radar::UNFRIENDLY = 2;
const int Radar::HOSTILE = 3;
const int Radar::INACTIVE = 4;
const int Radar::SPECIAL = 5;
const int Radar::ANOMALOUS = 6;
const int Radar::BLINK = 7;
const int Radar::VIEWPORT = 8;
const int Radar::STAR = 9;
void Radar::Clear()
{
objects.clear();
pointers.clear();
lines.clear();
}
void Radar::SetCenter(const Point ¢er)
{
this->center = center;
}
// Add an object. If "inner" is 0 it is a dot; otherwise, it is a ring. The
// given position should be in world units (not shrunk to radar units).
void Radar::Add(int type, Point position, double outer, double inner)
{
objects.emplace_back(GetColor(type).Opaque(), position - center, outer, inner);
}
// Add a pointer, pointing in the direction of the given vector.
void Radar::AddPointer(int type, const Point &position)
{
pointers.emplace_back(GetColor(type), position.Unit());
}
// Create a "corner" from a vertical and horizontal leg.
void Radar::AddViewportBoundary(const Point &vertex)
{
Point start(vertex.X() - copysign(200., vertex.X()), vertex.Y());
Point end(vertex.X(), vertex.Y() - copysign(200., vertex.Y()));
// Add the horizontal leg, pointing from start to vertex.
lines.emplace_back(GetColor(VIEWPORT), start, vertex - start);
// Add the vertical leg, pointing from end to vertex.
lines.emplace_back(GetColor(VIEWPORT), end, vertex - end);
}
// Draw the radar display at the given coordinates.
void Radar::Draw(const Point ¢er, double scale, double radius, double pointerRadius) const
{
// Draw any desired line vectors.
for(const Line &line : lines)
{
Point start = line.base * scale;
Point v = line.vector * scale;
// At least one endpoint must be within the radar display.
double startExcess = start.Length() - radius;
double endExcess = (start + v).Length() - radius;
if(startExcess > 0 && endExcess > 0)
continue;
else if(startExcess > 0)
{
// Move "start" along "v" until it is within the radius.
start += startExcess * v.Unit();
// Shorten "v" to keep the desired length.
v -= startExcess * v.Unit();
}
else if(endExcess > 0)
v -= endExcess * v.Unit();
LineShader::Draw(start + center, start + v + center, 1.f, line.color);
}
// Draw StellarObjects and ships.
RingShader::Bind();
for(const Object &object : objects)
{
Point position = object.position * scale;
double length = position.Length();
if(length > radius)
position *= radius / length;
position += center;
RingShader::Add(position, object.outer, object.inner, object.color);
}
RingShader::Unbind();
// Draw neighboring system indicators.
PointerShader::Bind();
for(const Pointer &pointer : pointers)
PointerShader::Add(center, pointer.unit, 10.f, 10.f, pointerRadius, pointer.color);
PointerShader::Unbind();
}
const Color &Radar::GetColor(int type)
{
static const vector<Color> color = {
*GameData::Colors().Get("radar player"),
*GameData::Colors().Get("radar friendly"),
*GameData::Colors().Get("radar unfriendly"),
*GameData::Colors().Get("radar hostile"),
*GameData::Colors().Get("radar inactive"),
*GameData::Colors().Get("radar special"),
*GameData::Colors().Get("radar anomalous"),
*GameData::Colors().Get("radar blink"),
*GameData::Colors().Get("radar viewport"),
*GameData::Colors().Get("radar star")
};
if(static_cast<size_t>(type) >= color.size())
type = INACTIVE;
return color[type];
}
Radar::Object::Object(const Color &color, const Point &pos, double out, double in)
: color(color), position(pos), outer(out), inner(in)
{
}
Radar::Pointer::Pointer(const Color &color, const Point &unit)
: color(color), unit(unit)
{
}
// Create a line starting from "base" with length and angle described by "vector."
Radar::Line::Line(const Color &color, const Point &base, const Point &vector)
: color(color), base(base), vector(vector)
{
}
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