doodle/pkg/collision/debug_box.go

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package collision
import (
"fmt"
"git.kirsle.net/go/render"
)
// CollisionBox holds all of the coordinate pairs to draw the collision box
// around a doodad.
type CollisionBox struct {
Top [2]render.Point
Bottom [2]render.Point
Left [2]render.Point
Right [2]render.Point
}
// NewBox creates a collision box from the Top Left and Bottom Right points.
func NewBox(topLeft, bottomRight render.Point) CollisionBox {
return GetCollisionBox(render.Rect{
X: topLeft.X,
Y: topLeft.Y,
W: bottomRight.X - topLeft.X,
H: bottomRight.Y - topLeft.Y,
})
}
// GetCollisionBox returns a CollisionBox with the four coordinates.
func GetCollisionBox(box render.Rect) CollisionBox {
return CollisionBox{
Top: [2]render.Point{
{
X: box.X,
Y: box.Y,
},
{
X: box.X + box.W,
Y: box.Y,
},
},
Bottom: [2]render.Point{
{
X: box.X,
Y: box.Y + box.H,
},
{
X: box.X + box.W,
Y: box.Y + box.H,
},
},
Left: [2]render.Point{
{
X: box.X,
Y: box.Y + box.H - 1,
},
{
X: box.X,
Y: box.Y + 1,
},
},
Right: [2]render.Point{
{
X: box.X + box.W,
Y: box.Y + box.H - 1,
},
{
X: box.X + box.W,
Y: box.Y + 1,
},
},
}
}
// String prints the bounds of the collision box in absolute terms.
func (c CollisionBox) String() string {
return fmt.Sprintf("CollisionBox<%s:%s>",
c.TopLeft(),
c.BottomRight(),
)
}
// TopLeft returns the point at the top left.
func (c CollisionBox) TopLeft() render.Point {
return render.NewPoint(c.Top[0].X, c.Top[0].Y)
}
// BottomRight returns the point at the bottom right.
func (c CollisionBox) BottomRight() render.Point {
return render.NewPoint(c.Bottom[1].X, c.Bottom[1].Y)
}