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Added example code for plotting

Author: HughMaingauche

VGA_plot_test.py

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+# Micropython PICO2 VGA plot library test file
+# https://github.com/HughMaingauche/PICO2-VGA-Micropython
+
+from VGA.VGA_800x600 import screen_800x600
+from VGA.VGA_plot import Plot, Line
+from math import cos, pi, sin
+
+#
+# 3 bit color names
+RED     = 0b001
+GREEN   = 0b010
+BLUE    = 0b100
+YELLOW  = 0b011
+BLACK   = 0
+WHITE   = 0b111
+CYAN    = 0b110
+MAGENTA = 0b101
+
+
+# Initialize VGA display
+display = screen_800x600()
+display.VGA_init()
+display.fill_screen(BLACK)
+
+plot1 = Plot(display, ul_x=1, ul_y=1, br_x=780, br_y=300,ax_color=WHITE, min_x=0, max_x=360, min_y=-1, max_y=1, x_ticks_num=10,y_ticks_num=10)
+line1 = Line(plot1, [], [], CYAN,label="cos(x)")
+line2 = Line(plot1, [], [], YELLOW,label="sin(x)")
+
+plot2 = Plot(display, ul_x=1, ul_y=320, br_x=280, br_y=590,ax_color=GREEN, min_x=-10, max_x=10, min_y=-1, max_y=6, x_ticks_num=10,y_ticks_num=5)
+line3 = Line(plot2, [], [], RED,label="cos(x) + 1/x^2") 
+
+plot3 = Plot(display, ul_x=320, ul_y=320, br_x=770, br_y=590,ax_color=YELLOW, min_x=-30, max_x=30, min_y=-17, max_y=17, x_ticks_num=10,y_ticks_num=10)
+line4 = Line(plot3, [], [], MAGENTA,label="sin(x).cos(x).x") 
+
+
+for x in range(360):
+    t=x*2*pi/360
+    line1.add_data_ns(x,cos(t),draw_line=True)
+    line2.add_data_ns(x,sin(t),draw_line=True)
+
+for x in range(-1000,1000):
+    if x!=0:
+        t=x/100
+        f=cos(t)+(1/t**2)
+        if f<6:
+            line3.add_data_ns(t,f,draw_line=True)
+
+for x in range(-2400,2400):
+    t=x/80
+    f=cos(t)*sin(t)*t
+    line4.add_data_ns(t,f,draw_line=True)