sin()
Definition
FLOAT sin ( <FLOAT angle> )
Returns the sine of the specified angle.
This function performs a sine calculation on a certain angle and returns a value between -1 and 1.
Parameters
FLOAT angle - Angle, in thousandths of degrees. i.e. 75000 = 75º
Returns
FLOAT : The sine result of the specified angle.
Notes
The angle value returned by this function is in thousandths of degrees, as most angles within Bennu are.
To read about all aspects of trigonometry, you can visit Wikipedia’s Trigonometric function page.
Example
Const
screen_width = 320;
screen_height = 200;
screen_border = 15;
End
Global
float value;
End
Process Main()
Begin
// Modes
set_title("Sine Graph");
set_mode(screen_width,screen_height);
// X axis
for(x=1;x<=8;x++)
write( 0,
screen_border+x*(screen_width-screen_border)/8+3,
screen_height-1,
8,
itoa(x*360/8 )+"^" );
end
draw_line(1,screen_height-screen_border,screen_width,screen_height-screen_border);
// Y axis
write(0,screen_border-1,20,5,"1");
write(0,screen_border-1,screen_height/2,5,"0");
write(0,screen_border-1,screen_height-20,5,"-1");
draw_line(screen_border,1,screen_border,screen_height-1);
// Draw tangent
for(angle=0;angle<360;angle++)
value=sin(angle*1000)*(screen_height/2-20);
put_pixel( screen_border+angle*(screen_width-screen_border)/360,
screen_height/2-value,
rgb(255,255,255) );
// screen_height/2-value because the screen's origin (0,0) is topleft instead of downleft.
end
Repeat
frame;
Until(key(_ESC))
End
Used in example: set_title(), set_mode(), write(), draw_line(), sin(), put_pixel(), key().