Download or view simplegraph2.frink in plain text format
// This is a simple but rather interesting program that graphs equations.
// You enter equations in terms of x and y, something like one of the
// following:
//
// y = sin[x]
//
// x^2 + y^2 = 81
//
// y cos[x] = x sin[y]
//
lasteq = ""
while func = input["Enter equation: ", lasteq]
{
lasteq = func
func =~ %s/=/ PEQ / // Replace = with possibly equals
expr = parseToExpression[func]
g = new graphics
xsteps = 1024
xmin = -10
xmax = 10
xstep = (xmax-xmin) / xsteps
ysteps = 1024
ymin = -10
ymax = 10
ystep = (ymax-ymin) / ysteps
for yy=ymax to ymin step -ystep
{
y = new interval[yy, yy+ystep]
for xx=xmin to xmax step xstep
{
x = new interval[xx, xx+xstep]
if eval[expr]
g.fillRectSize[xx,-yy,xstep,ystep]
}
}
g.drawRectSides[xmin,ymin,xmax,ymax]
g.show[]
}
Download or view simplegraph2.frink in plain text format
This is a program written in the programming language Frink.
For more information, view the Frink
Documentation or see More Sample Frink Programs.
Alan Eliasen was born 20314 days, 9 hours, 12 minutes ago.