vstup= qgis.utils.iface.activeLayer()
bodyv = vstup.getFeatures()
body=[]
for i in bodyv:
	body.append(i.geometry().asPoint())
konvex=[]
x0=1.0
y0=1.0
index0= None
for i in range(0,len(body)-1):
    if body[i].x()<x0:
        
        x0=body[i].x()
        y0=body[i].y()
        index0=i
for i in range(0,len(body)-1):
    if x0=body[i].x() and y0<body[i].y():
        y0=body[i].y()
        index0 = i
konvex.append(body.pop(index0))