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以下代码画圆,只显示一个圆,圆周有小缺口。如何画多个圆呢,能画完美的圆吗,能画实心圆吗,
如何将显示窗口放到屏幕中间位置呢?
- import cocos
- from cocos.director import director
- from pyglet.gl import *
- from math import cos, tan, pi
- class TestLayer(cocos.layer.Layer):
- def __init__(self):
- super().__init__()
- # 画圆
- circle_centers=[(100, 540), (260,540), (420,540), (260,380)]
- for circle_center in circle_centers:
- self.circle_center = circle_center
- self.circle_radius = 50
- def draw(self):
- super().draw()
- # 设置颜色为红色并绘制圆
- glColor4ub(255, 0, 0, 255)
- glLineWidth(10)
- num_segments = 350
- theta = 2 * pi / num_segments
- tangetial_factor = tan(theta) # Calculate the tangential factor
- radial_factor = cos(theta) # Calculate the radial factor
- x = self.circle_radius # Start at angle = 0
- y = 0
- glBegin(GL_LINE_LOOP)
- for i in range(num_segments):
- glVertex2f(x + self.circle_center[0], y + self.circle_center[1])
- tx = -y
- ty = x
- x += tx * tangetial_factor
- y += ty * tangetial_factor
- x *= radial_factor
- y *= radial_factor
- glEnd()
- def main():
- director.init(resizable=True, width=520, height=640, caption="szq")
- test_layer = TestLayer()
- main_scene = cocos.scene.Scene(test_layer)
- director.run(main_scene)
- if __name__ == '__main__':
- main()
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要在实心圆内再画一个小一点的背景色实心圆以实现圆环的效果,可以按照以下步骤修改代码:
1. **画大圆:** 先画出具有指定颜色的大圆。
2. **画小圆:** 在大圆内部画一个稍小的圆,颜色与背景色一致,这样就能形成一个圆环效果。
以下是修改后的代码示例:
- import cocos
- from cocos.director import director
- from pyglet.gl import *
- from math import cos, sin, pi
- class TestLayer(cocos.layer.Layer):
- def __init__(self):
- super().__init__()
- # 定义多个圆心及其半径、颜色
- self.circles = [
- # 示例:圆心(x, y),半径,颜色
- (200, 200, 100, (255, 0, 0)), # 红色大圆
- (400, 300, 70, (0, 255, 0)) # 绿色大圆
- ]
- self.background_color = (255, 255, 255) # 背景色,白色
- def draw(self):
- super().draw()
- num_segments = 100 # 用于更平滑的圆
- theta = 2 * pi / num_segments
- for circle_center_x, circle_center_y, circle_radius, color in self.circles:
- # 画大圆 (环的外圈,实际可见)
- R, G, B = color
- glColor4ub(R, G, B, 255) # 设置颜色
- x, y = circle_radius, 0
- glBegin(GL_TRIANGLE_FAN)
- glVertex2f(circle_center_x, circle_center_y)
- for _ in range(num_segments + 1):
- glVertex2f(circle_center_x + x, circle_center_y + y)
- t = x
- x = cos(theta) * x - sin(theta) * y
- y = sin(theta) * t + cos(theta) * y
- glEnd()
- # 画小圆 (环的内圈,用背景色覆盖)
- inner_radius = circle_radius - 10 # 调整这个值来设置环的厚度
- if inner_radius > 0:
- glColor4ub(*self.background_color, 255) # 设置背景色
- x, y = inner_radius, 0
- glBegin(GL_TRIANGLE_FAN)
- glVertex2f(circle_center_x, circle_center_y)
- for _ in range(num_segments + 1):
- glVertex2f(circle_center_x + x, circle_center_y + y)
- t = x
- x = cos(theta) * x - sin(theta) * y
- y = sin(theta) * t + cos(theta) * y
- glEnd()
- def main():
- # 初始化舞台
- window_width = 640
- window_height = 480
- director.init(resizable=True, width=window_width, height=window_height, caption="szq")
- # 将窗口放置于屏幕中央
- display = director.window.display
- screen_width, screen_height = display.get_default_screen().width, display.get_default_screen().height
- window_x = (screen_width - window_width) // 2
- window_y = (screen_height - window_height) // 2
- director.window.set_location(window_x, window_y)
- test_layer = TestLayer()
- main_scene = cocos.scene.Scene(test_layer)
- director.run(main_scene)
- if __name__ == '__main__':
- main()
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### 说明:
- **颜色设置:** 使用`glColor4ub`设置绘制的颜色。
- **内外圆:** 外圆用指定颜色绘制,内圆用背景色绘制,从而形成环形。
- **环厚度:** 通过调整`inner_radius`相对于`circle_radius`的大小,改变环的厚度。
以上回复来自 FishC AI 小助理,如未能正确解答您的问题,请继续追问。
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