I am using pygame and the math module to try and draw a rectangle around two points. Here's what I mean by that:
The distance from the points to the ends of the rectangles is specified as an attribute of the class. I have tried a lot to get this to where it is, and the angle shown is probably the only working angle. Here is my class for the rectangle:
def Pol(x, y):
"""Converts rectangular coordinates into polar ones"""
if x == 0: # This might be the source of my problems, but without it, it raises ZeroDivisionErrors at certain places
if y >= 0:
return [y, 90]
else:
return [-y, 270]
r = math.sqrt(x**2+y**2)
angle = (math.degrees(math.atan((y/x))))%360
return [r, angle]
class Path(pygame.sprite.Sprite):
def __init__(self, start, end, color, width, **options):
self.__dict__.update(options)
self.start = start
self.end = end
self.color=color
# Call the parent class (Sprite) constructor
super().__init__()
# Pass in the color of the blob, and its x and y position, width and height
# Set the background color and make it transparent
self.width = width
# Draw the path
self.redraw()
# Fetch the rectangle object that has the dimensions of the image.
self.rect = self.image.get_rect()
self.rect.x, self.rect.y = (self.start[0]-self.width//2+self.ix,
self.start[1]-self.width//2+self.iy)
if self.inversed:
self.rect.y-=(math.ceil(self.image.get_rect()[3]/2)-self.iy)
def redraw(self):
dis, angle = Pol(self.end[0]-self.start[0], self.end[1]-self.start[1])
dis += self.width
_image = pygame.Surface([dis, self.width])
_image.fill([255, 255, 255])
_image.set_colorkey([255, 255, 255])
pygame.draw.rect(_image, self.color, pygame.Rect(0, 0, dis, self.width))
nangle = (180-angle)%360
self.inversed = nangle>=180
self.image = pygame.transform.rotate(_image, nangle)
i1 = _image.get_rect()
i2 = self.image.get_rect()
ix = i2[2]-i1[2]
iy = i2[3]-i1[2]
self.ix = ix//2
self.iy = iy//2
So, I pass it some points, and it takes care of all the heavy lifting, and drawing. The points I passed it in the image were (100, 100) and (200, 200). I then tried it with (300, 300) and (200, 200), and it performed semi-successfully:
The code is above, you can try it out with other values, but you'll see that it quickly becomes problematic. To wrap it up, my question is, is there a robust way to draw a rectangle around given two points? I have tried:
- with drawing thick lines, but pygame lines get broken up at certain angles, and have horizontal endings
- testing and playing over and over again with the values, nothing I've tried works
- changing the inverse if statement. According to what I think should happen, it's already backward
