CODEWITHSUNDEEP
pythonpygame
Muhammad Umer
Muhammad Umer

Reputation: 123

Detect if an circle is clicked in pygame?

I have a class of Circle It is:

import pygame
pygame.init()
import math

class Circle:
    def __init__(self, circle_x, cirlce_y, circle_radius):
        self.circle_x = circle_x
        self.circle_y = cirlce_y
        self.circle_radius = circle_radius

    def clicked(self):
        mouse_x, mouse_y = pygame.mouse.get_pos()
        area = math.pi * self.circle_radius * self.circle_radius
        print(area)
        if self.circle_x - self.circle_radius <= mouse_x <= self.circle_x + self.circle_radius and self.circle_y -  self.circle_radius <= mouse_y <= self.circle_y + self.circle_radius:
            return True

the problem is that it is working good but when as the circle have round edges. But wheni click on the a point some distance away from the edge of the circle its still detecting that the circle is clicked. how can i omit this error and detect circle click only in the circle boundary not detecting circle as a sqaure?

Upvotes: 1

Views: 129

Answers (1)

Rabbid76
Rabbid76

Reputation: 210889

You need to calculate the Euclidean distance between the center of the circle and the mouse. Test if this distance is less than the radius:

def clicked(self):
    mouse_x, mouse_y = pygame.mouse.get_pos()
    dx = mouse_x - self.circle_x
    dy = mouse_y - self.circle_y
    distance = math.sqrt(dx*dx + dy*dy)  # or: distance = math.hypot(dx, dy)
    return distance <= self.circle_radius

You can improve performance and get rid of the costly math.sqrt operation by comparing the square of the distance to the square of the radius:

def clicked(self):
    mouse_x, mouse_y = pygame.mouse.get_pos()
    dx = mouse_x - self.circle_x
    dy = mouse_y - self.circle_y
    return dx*dx + dy*dy <= self.circle_radius*self.circle_radius

Upvotes: 3

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