Microsoft Small Basic

Program Listing: TKZ358

List Program

' Molecular Structure of Water
' Version 0.1
' Copyright © 2019 Nonki Takahashi. The MIT License.
' Last update 2019-11-16

GraphicsWindow.Title = "Molecular Structure of Water"
GraphicsWindow.BackgroundColor = "LightGray"
atom["O"] = "color=#EE0000;size=100;"
atom["H"] = "color=White;size=50;"
gap = 20
a = 104.45 ' [degree]
gw = GraphicsWindow.Width
gh = GraphicsWindow.Height
mol = "H_2O"
DrawMolecularName()
' draw line (1)
x1 = gw / 2
y1 = gh * 0.45
size = atom["O"]["size"]
_size = size
size = atom["H"]["size"]
r = _size / 2 + size / 2 + gap
_ah = Math.GetRadians(a / 2)
x2 = x1 - r * Math.Sin(_ah)
y2 = y1 + r * Math.Cos(_ah)
GraphicsWindow.PenColor = "DimGray"
GraphicsWindow.PenWidth = 4
GraphicsWindow.DrawLine(x1, y1, x2, y2)
' draw H (1)
ox = x2
oy = y2
bc = atom["H"]["color"]
FillCircle()
' draw line (2)
x2 = x1 + r * Math.Sin(_ah)
GraphicsWindow.DrawLine(x1, y1, x2, y2)
' draw H (2)
ox = x2
FillCircle()
' draw O
ox = x1
oy = y1
size = atom["O"]["size"]
bc = atom["O"]["color"]
FillCircle()

Sub DrawMolecularName
GraphicsWindow.FontName = "Trebuchet MS"
GraphicsWindow.BrushColor = "Black"
x = 30
For p = 1 To Text.GetLength(mol)
c = Text.GetSubText(mol, p, 1)
If c = "_" Then
y = 35
p = p + 1
fs = 20
c = Text.GetSubText(mol, p, 1)
Else
y = 20
fs = 30
EndIf
GraphicsWindow.FontSize = fs
GraphicsWindow.DrawText(x, y, c)
x = x + fs * 0.7
EndFor
EndSub

Sub FillCircle
GraphicsWindow.BrushColor = bc
GraphicsWindow.FillEllipse(ox - size / 2, oy - size / 2, size, size)
EndSub