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	float value;		float value;
	Begin		Begin
		+
		+	// Modes
	set_title("Cosine Graph");		set_title("Cosine Graph");
	set_mode(825,480);		set_mode(825,480);
-		+
		+	// X axis
	for(x=50;x<=800;x+=50)		for(x=50;x<=800;x+=50)
	write(0,x,479,6,itoa(x*360/800));		write(0,x,479,6,itoa(x*360/800));
	end		end
-		+	draw_line(1,470,824,470);
		+
		+	// Y axis
	write(0,1,20,3,"1");		write(0,1,20,3,"1");
	write(0,1,240,3,"0");		write(0,1,240,3,"0");
	write(0,1,460,3,"-1");		write(0,1,460,3,"-1");
-
	draw_line(15,1,15,479);		draw_line(15,1,15,479);
-	draw_line(1,470,824,470);	+
-		+	// Draw cosine
	for(angle=0;angle<360;angle++)		for(angle=0;angle<360;angle++)
	value=cos(angle*1000)*220;		value=cos(angle*1000)*220;

---

Revision as of 00:53, 8 June 2007

Contents 1 Definition 2 Parameters 3 Returns 4 Notes 5 Example

Definition

FLOAT cos ( <FLOAT angle> )

Returns the cosine of the specified angle.

This function performs a cosine calculation on the specified angle and returns the value as a floating point number 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 Fenix are, and will return a floating point value between -1 and 1.

To read about all aspects of trigonometry, you can click on Wikipedia's Trigonometric function page.

Example

Program example_cos;
Global
    float value;
Begin

    // Modes
    set_title("Cosine Graph");
    set_mode(825,480);

    // X axis    
    for(x=50;x<=800;x+=50)
        write(0,x,479,6,itoa(x*360/800));
    end
    draw_line(1,470,824,470);

    // Y axis    
    write(0,1,20,3,"1");
    write(0,1,240,3,"0");
    write(0,1,460,3,"-1");
    draw_line(15,1,15,479);

    // Draw cosine    
    for(angle=0;angle<360;angle++)
        value=cos(angle*1000)*220;
        put_pixel(angle*800/360,240+value,rgb(255,255,255));
    end

    Repeat
        frame;
    Until(key(_esc))

End

Used in example: set_title(), set_mode(), write(), draw_line(), put_pixel(), key() This will result in something like: