generated from mwc/project_drawing
f41cffdf23
I was struggling how to draw an oval for my penguin. I needed to look up videos/read up how to do it. I also had to look up how to set the size of the image. I found it really difficult to just start the penguin, but once I got the shapes I felt more comfortable.
50 lines
1.5 KiB
Python
50 lines
1.5 KiB
Python
import turtle
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from math import cos, sin, pi, radians
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def move_to(x, y):
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t.penup(); t.goto(x, y); t.pendown()
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def filled_rect(x1, y1, x2, y2, fill, outline="black"):
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t.pencolor(outline)
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t.fillcolor(fill)
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move_to(x1, y1)
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t.begin_fill()
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t.goto(x2, y1)
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t.goto(x2, y2)
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t.goto(x1, y2)
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t.goto(x1, y1)
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t.end_fill()
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def draw_oval(cx, cy, rx, ry, tilt=0, fill=None, steps=180):
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"""Parametric ellipse; steps controls smoothness."""
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ang = radians(tilt)
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def R(x, y): # rotate (x,y) by tilt
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return (x*cos(ang) - y*sin(ang), x*sin(ang) + y*cos(ang))
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t.fillcolor(fill if fill else "")
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move_to(cx + rx, cy) # start at angle 0
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if fill:
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t.begin_fill()
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for i in range(1, steps + 1):
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theta = 2*pi*i/steps
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x, y = rx*cos(theta), ry*sin(theta)
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xr, yr = R(x, y)
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t.goto(cx + xr, cy + yr)
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if fill:
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t.end_fill()
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def poly(points, fill=None):
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if fill: t.fillcolor(fill); t.begin_fill()
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move_to(*points[0])
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for p in points[1:]:
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t.goto(*p)
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t.goto(*points[0])
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if fill: t.end_fill()
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def right_triangle(ax, ay, leg1, leg2, angle=0, fill=None):
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"""Right angle at (ax, ay). leg1 along 'angle' degrees, leg2 perpendicular."""
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a = radians(angle)
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B = (ax + leg1*cos(a), ay + leg1*sin(a)) # along angle
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C = (ax - leg2*sin(a), ay + leg2*cos(a)) # 90° to the left
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poly([(ax, ay), B, C], fill=fill)
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