rect

2 files changed, 66 insertions, 0 deletions

diff --git a/pos.lua b/pos.lua
index 605ecbd..149783e 100644
--- a/pos.lua
+++ b/pos.lua
@@ -36,6 +36,7 @@ function Pos.lensq(self) return self.x^2 + self.y^2 end
 function Pos.len(self) return math.sqrt(self:lensq()) end
 function Pos.norm(self) return self/self:len() end
 function Pos.dot(self,other) return self.x*other.x+self.y*other.y end
+function Pos.vals(self) return self.x, self.y end
 function Pos.__tostring(self)
 	return string.format("(%.2f,%.2f)",self.x,self.y)
 end
diff --git a/rect.lua b/rect.lua
new file mode 100644
index 0000000..ca87e49
--- /dev/null
+++ b/rect.lua
@@ -0,0 +1,65 @@
+local class = require'r.class'
+local Pos = require'r.pos'
+local Rect = class()
+function Rect.from_coords(cls, x0, y0, x1, y1)
+	assert(x0<x1,"x coords interchanged")
+	assert(y0<y1,"y coords interchanged")
+	return setmetatable({
+		tl=Pos:make(x0,y0),
+		br=Pos:make(x1,y1),
+		x0=x0, y0=y0, x1=x1, y1=y1,
+		w=x1-x0, h=y1-y0,
+	}, cls)
+end
+function Rect.from_pos(cls, tl, br)
+	assert(tl.x<br.x,"x coords interchanged")
+	assert(tl.y<br.y,"y coords interchanged")
+	return setmetatable({
+		tl=tl, br=br,
+		x0=tl.x, y0=tl.y, x1=br.x, y1=br.y,
+		w=br.x-tl.x, h=br.y-tl.y,
+	}, cls)
+end
+function Rect.from_xywh(cls, x0,y0, width,hight)
+	assert(0<width, "nonpositive width")
+	assert(0<hight, "nonpositive hight")
+	return setmetatable({
+		tl=Pos:make(x0,y0),
+		br=Pos:make(x0+width,y0+hight),
+		x0=x0, y0=y0,
+		x1=x0+width,
+		y1=y0+hight,
+		w=width, h=hight,
+	}, cls)
+end
+function Rect.from_centre_dims(cls, centre, width, hight)
+	assert(0<width, "nonpositive width")
+	assert(0<hight, "nonpositive hight")
+	local x0,x1 = centre.x-width/2, centre.x+width/2
+	local y0,y1 = centre.y-hight/2, centre.y+hight/2
+	return setmetatable({
+		tl=Pos:make(x0,y0),
+		br=Pos:make(x1,y1),
+		x0=x0,y0=y0,x1=x1,y1=y1,
+		w=width, h=hight,
+	}, cls)
+end
+
+function Rect.has(self, point)
+	return self.x0 <= point.x and point.x <= self.x1
+	   and self.y0 <= point.y and point.y <= self.y1
+end
+
+function Rect.vals(self)
+	return self.x0, self.y0, self.w, self.h
+end
+
+function Rect.draw(self, mode)
+	love.graphics.rectangle(mode or 'line', self:vals())
+end
+
+function Rect.__tostring(self)
+	return tostring(self.tl).."\u{25af}"..tostring(self.br)
+end
+
+return Rect