Graph It aka Graph IT II (schaubild) aka Graph IT Enhanced - DXG 5717

Dieses Programm stellt eingegebene Werte wahlweise als
Säulen- oder als Kreis-Segment-Graphiken dar. Darüber
hinaus konnen Sie 2- oder 3-dimensional Funktionen auf dem
Bildschirm erscheinen lassen. Bestimmte Karrenz-Werte
lassen sich über Cursor und Steuerknüppel abrufen.

Developer: Original developer of the US release (CX4109): Lane Winner (uncredited). / Howard D. Siebenrock
According to source code (REM at line 0):
GRAPH.2D (“Graphit II -2D”): ENHANCMENTS BY HOWARD SIEBENROCK / REV 1.3 11-13-81 (Yes, including the typo at “ENHANCMENTS” ! 😉 )
GRAPH.3D (“Graphit II -3D”): ENHANCED BY HOWARD SIEBENROCK / REV 1.3 11-15-81
GRAPH.BPI (“Balken – und Kreisdiagramme”): GRAPH IT BAR-PIE REV 0.1 7-5-80 / ENHANCED BY HOWARD SIEBENROCK REV. 1.3 11.13.81
GRAPH.POL (“Polardastellung”): GRAPH POL:REV 0.3 9-25-80 / ENHANCED BY HOWARD SIEBENROCK VES. 1.3 11-14-81

Date: 1981 according to cover and source code, 1983 according to booklet.
Distributed by: ATARI Elektronik Vertriebs GMBH, Bebelalee 10 – 2000 Hamburg 60
Dump: Download –  Source Atarinside – .Pro format including protection log (Disk protected with bad sectors) – Boot without « Option » key
Notes: Translation and enhancement of “Graph IT” – CX4109 – USA.
Atariwiki reports that another release was also made for Germany with a different source code of “GRAPH IT BAR-PIE” in 1982.
How to run : Load .PRO in your emulator, boot without option key and wait. Enable Disk SIO Patch if you don’t want to wait.
The original disk was protected with intentionnal bad sectors.

Other translations :
USA : “Enhancements to Graph It” – APX 20074 – 1982
Italy : “Grafica – DXT 4109 – 1984”

Rendering comparison (“Graphit II -3D”):

1 – Heart
Atari Formula : 5+​(‑sqr(​1-​x^​2-​(y-​abs(​x))^​2))*​cos(​30*​(1-​x^​2-​(y-​abs(​x))^​2))
Google Formula : 5 + (-sqrt(1-x^2-(y-abs(x))^2))*cos(30*((1-x^2-(y-abs(x))^2))), x is from -1 to 1, y is from -1 to 1.5, z is from 1 to 6

2 – Water drop
Atari Formula : sqr(x*x+y*y)+3*cos(sqr(x*x+y*y))+5
Google Formula : sqrt(x*x+y*y)+3*cos(sqrt(x*x+y*y))+5 from -20 to 20

3 – Egg
Atari Formula : 1.2+(sqr(1-(sqr(x^2+y^2))^2)+1–x^2-y^2)*(sin(10*(x*3+y/5+7))+1/4)
Google Formula : 1.2+(sqrt(1-(sqrt(x^2+y^2))^2)+1–x^2-y^2)*(sin(10*(x*3+y/5+7))+1/4) from -1.6 to 1.6

4 – Wheel

Atari Formula : (0.4^2-(0.6-(x^2+y^2)^0.5)^2)^0.5
Google Formula : (0.4^2-(0.6-(x^2+y^2)^0.5)^2)^0.5

5 – Pyramid

Atari Formula : 1-abs(x+y)-abs(y-x)
Google Formula : 1-abs(x+y)-abs(y-x)

6 – Waves

Atari Formula : x*sin(-(x*x)-(y*y))
Google Formula : x*sin(-(x*x)-(y*y)) from -5 to 5