Sin & cos Curves in Canvas

How to draw curves in canvas ?

y2=y1-h*math.sin(in_redian)

l1=c1.create_line(x1, y1, x1,y2,fill='red',width=1)

import tkinter as tkimport mathmy_w = tk.Tk()width,height=410,210 # set the variables c_width,c_height=width-10,height-10 # canvas width heightd=str(width)+"x"+str(height)my_w.geometry(d) 
c1 = tk.Canvas(my_w, width=c_width, height=c_height,bg='lightgreen')c1.grid(row=0,column=0,padx=5,pady=5,columnspan=3)
speed=10 # in milliseconds, delay timmer, drawing speed
x1,y1=5,int(c_height/2)h=y1-10 # gap from curve top to canvas edge in_degree=0 # starting angle 
def my_draw():    global in_degree,x1,y1    in_degree=in_degree+1    in_redian = math.radians(in_degree)    y2=y1-h*math.sin(in_redian)    #y2=(h+10)-h*math.cos(in_redian)    l1=c1.create_line(x1, y1, x1,y2,fill='red',width=1)       if (x1<width-10): # check the right edge        x1=x1+1        c1.after(speed,my_draw)    else:        return    
my_draw()
my_w.mainloop()

Drawing along the curve

import tkinter as tkimport mathmy_w = tk.Tk()width,height=410,210 # set the variables c_width,c_height=width-10,height-10 # canvas width heightd=str(width)+"x"+str(height)my_w.geometry(d) c1 = tk.Canvas(my_w, width=c_width, height=c_height,bg='lightgreen')c1.grid(row=0,column=0,padx=5,pady=5,columnspan=3)speed=10 # in milliseconds, delay timmer x1,y1=5,int(c_height/2)h=y1-10  # gap between canvas top edge and curve top c1.create_line(x1,y1,c_width-5,y1,arrow='last') # x Axis c1.create_line(x1,y1,x1,10,arrow='last') # Y  Axis 
in_degree=0 # starting angle def my_draw():    global in_degree,x1,y1    in_degree=in_degree+1    in_redian = math.radians(in_degree)    y2=(h+10)-h*math.sin(in_redian) # sin  curve     #y2=(h+10)-h*math.cos(in_redian) #  cos curve     x2=x1+0.5  # increasing x value      l1=c1.create_line(x1, y1, x2,y2,fill='red',width=2)       if (x2<c_width-5): # check the right edge        x1,y1=x2,y2        c1.after(speed,my_draw)    else:        return    my_draw()my_w.mainloop()

y2=(h+10)-h*math.sin(in_redian) # sin  curve #y2=(h+10)-h*math.cos(in_redian) #  cos curve 

Both sin and cos curves in same canvas

import tkinter as tk
import math
my_w = tk.Tk()
width,height=410,210 # set the variables c_width,c_height=width-10,height-10 # canvas width heightd=str(width)+"x"+str(height)my_w.geometry(d) 
c1 = tk.Canvas(my_w, width=c_width, height=c_height,bg='lightgreen')c1.grid(row=0,column=0,padx=5,pady=5,columnspan=3)
speed=10 # in milliseconds, delay timmer x1,z1,y1=5,5,int(c_height/2)h=y1-10 # gap from curve top to canvas edge 
c1.create_line(x1,y1,c_width-5,y1,arrow='last') # x Axis 
c1.create_line(x1,y1,x1,5,arrow='last') # Y  Axis in_degree=0def my_draw():    global in_degree,x1,y1,z1    in_degree=in_degree+1    in_redian = math.radians(in_degree)    y2=(h+10)-h*math.cos(in_redian) # cos curve     z2=(h+10)-h*math.sin(in_redian) # sin curve     x2=x1+0.5  # X axis steps     l1=c1.create_line(x1, y1, x2,y2,fill='red',width=1)       l2=c1.create_line(x1, z1, x2,z2,fill='blue',width=1)       if (x2<c_width-10): # check the right edge        x1=x2        y1=y2        z1=z2        c1.after(speed,my_draw)    else:        return    my_draw()
my_w.mainloop()

Subhendu Mohapatra

Author & Instructor at plus2net

I write and maintain practical tutorials on Python, PHP, SQL, JavaScript, HTML, jQuery, and web development at plus2net. The tutorials focus on clear explanations, working examples, and code that readers can test and adapt while learning.

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