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#pragma once
#include "math/Vector2.h"
#include <functional>
namespace selection
{
class Rectangle
{
public:
Vector2 min;
Vector2 max;
Rectangle()
{}
Rectangle(const Vector2& min_, const Vector2& max_) :
min(min_),
max(max_)
{}
bool empty() const
{
return (min - max).getLengthSquared() == 0;
}
// Converts this rectangle to window coordinates, pass width and height of the window
void toScreenCoords(std::size_t width, std::size_t height)
{
min = device2screen(min, width, height);
max = device2screen(max, width, height);
}
// Public typedef
typedef std::function<void (const Rectangle&)> Callback;
// Constructs a Rectangle centered at the given point, with edge length 2*epsilon
// This is used to construct small rectangles at some mouse coordinates for selection tests
static Rectangle ConstructFromPoint(const Vector2& point, const Vector2& epsilon)
{
return Rectangle(point - epsilon, point + epsilon);
}
// greebo: Constructs a Rectangle from (start) to (start + delta) and ensures
// that the resulting Rectangle's min is smaller than its max, in case delta has negative components
static Rectangle ConstructFromArea(const Vector2& start, const Vector2& delta)
{
return Rectangle(
Vector2(
delta[0] < 0 ? (start[0] + delta[0]) : start[0],
delta[1] < 0 ? (start[1] + delta[1]) : start[1]
),
Vector2(
delta[0] > 0 ? (start[0] + delta[0]) : start[0],
delta[1] > 0 ? (start[1] + delta[1]) : start[1]
)
);
}
private:
Vector2 device2screen(const Vector2& coord, std::size_t width, std::size_t height)
{
return Vector2(
((coord.x() + 1.0) * 0.5) * width,
((coord.y() + 1.0) * 0.5) * height
);
}
};
} // namespace
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