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# graph area
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set plotx 50
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set ploty 50
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set plotw 380
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set ploth 220
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set cx (plotx + (plotw / 2))
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set cy (ploty + (ploth / 2))
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# graph range
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set xmin (0 - 10)
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set xmax 10
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set ymin (0 - 10)
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set ymax 10
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set xinc (plotw / (xmax - xmin))
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set yinc (ploth / (ymax - ymin))
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color 3 3 3 > mlines
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# print axis
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func makegrid
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rect plotx ploty plotw ploth 0
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set x plotx
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do
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line x ploty x (ploty + ploth) mlines
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set x (x + xinc)
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while (x <= plotx + plotw)
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set y ploty
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do
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line plotx y (plotx + plotw) y mlines
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set y (y + yinc)
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while (y <= ploty + ploth)
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line cx ploty cx (ploty + ploth) 32767
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line plotx cy (plotx + plotw) cy 32767
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end
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#
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# BIG LOOP - ask for equ, graph it
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#
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makegrid
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set clearcmd "clear"
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do
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rect 0 0 480 40
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print "f(x) = "
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gets > Fx
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if (Fx == clearcmd)
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makegrid
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else
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# do function
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set x xmin
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do
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solve Fx > y
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set y (0 - y)
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if ((y > ymin) & (y < ymax))
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pixel (cx + x * xinc) (cy + y * yinc) 511
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end
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set x (x + 1 / xinc)
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while (x < xmax)
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end
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ppos 0 0
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while (1)
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