Definite integral

# This program calculates the area between two functions the parameters functions, boundaries are hardcoded but they are highlighted for you to change





 font "arial", 15,100
 graphsize 500,500
 fastgraphics
 # Choose the dimentions of the graph#############
 xmin=-5
 xmax=5
 ymin=-5
 ymax=5
 ##########################################
 y1=0:y2=0
 tx=500/(xmax-xmin)
 ty=500/(ymax-ymin)
 for y = ymin to ymax
 for x = xmin to xmax
 circle tx*x-xmin*tx, ty*y-ymin*ty,3
 if y=ymax+ymin then text tx*x-xmin*tx-15, ty*y-ymin*ty,x
 if x=0 then text tx*x-xmin*tx-15, ty*y-ymin*ty,-y+ymax+ymin
 next x : next y
 line -xmin*tx,0,-xmin*tx,500 : line 0,500+ymin*ty,500,500+ymin*ty
 rem generate area
 #Choose the x boundaries#####################
 bound1=-2
 bound2=2
 #########################################
 area=0
 range=bound2-bound1
 dx=.01
 for x = xmin to xmax step dx
 xg= tx*x-xmin*tx
 color red
 p1=y1
 #Equation1 red#############################
 y1=x^2
 #########################################
 yg1= 500-ty*y1+ty*ymin
 circle xg, yg1,1
 color blue
 p2=y2
 #Equation2 blue###########################
 y2=x-2
 ########################################
 yg2= 500-ty*y2+ty*ymin
 circle xg, yg2,1
 if x<= bound2 and x>= bound1 then
 color darkgreen
 area=area+((y1+p1)/2-(y2+p2)/2)*dx
 if int(xg+1)/2 = int(xg/2+1) then line xg,yg1,xg,yg2
 fill= 255*(x-bound1)/range
 end if
 next x
 refresh
 input "press a key",a
 text 20,20,"Area="+area
 refresh