cos()
Definition
FLOAT cos ( <FLOAT angle> )
Returns the cosine of the specified angle.
This function performs a cosine 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 cosine result of the specified angle.
Notes
The angle value used in this function should be in thousandths of degrees, as most angles within Bennu are.
To read about all aspects of trigonometry, you can visit Wikipedia’s Trigonometric functions and atan2 pages.
Example
Const
screen_width = 320;
screen_height = 200;
screen_border = 15;
End
Global
float value;
End
Process Main()
Begin
// Modes
set_title("Cosine 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=cos(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(), cos(), put_pixel(), key().