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Revision as of 21:28, 25 July 2007

Contents 1 Definition 2 Parameters 3 Returns 4 Notes 5 Example

Definition

INT get_disty ( <INT angle> , <INT distance> )

Returns the vertical distance in pixels of a specified displacement.

Parameters

INT angle	- Angle, in thousandths of degrees (90° = 90000).
INT distance	- Length (in pixels) to measure.

Returns

INT : The vertical distance, in pixels, of a specified displacement.

Notes

This function returns the height of an imaginary rectangle who's opposite corners are the specified distance apart, at the specified angle from each other.

Example

Program example;
global
    xdist;
    ydist;
    dist;
    ang;
    mydraw;
Begin
    set_mode(640,480,16);
    set_fps(50,0);
    graph=new_map(3,3,16);
    map_clear(0,graph,rgb(0,255,0));
    x=320;y=240;

    set_text_color(rgb(0,0,0));
    write(0,60,0,2,"X Diff: ");
    write_int(0,60,0,0,&xdist);
    write(0,60,10,2,"Y Diff: ");
    write_int(0,60,10,0,&ydist);
    write(0,60,20,2,"Angle: ");
    write_int(0,60,20,0,&ang);
    write(0,60,30,2,"Distance: ");
    write_int(0,60,30,0,&dist);

    write(0,10,40,0,"Left/right rotates your angle, up/down changes your distance");
    
    put(0,graph,x,y);
    drawing_background();

    repeat
        if(key(_up))
            dist++;
        end

        if(key(_down))
            dist--;
        end

        if(key(_left))
            ang-=1000;
        end

        if(key(_right))
            ang+=1000;
        end

        xdist=get_distx(ang,dist);
        ydist=get_disty(ang,dist);

        x=320+xdist;
        y=240+ydist;

        frame;


    until(key(_esc))
    exit();
End

process drawing_background()
begin
    graph=new_map(640,480,16);set_center(0,graph,0,0);map_clear(0,graph,rgb(64,0,0));
    drawing_map(0,graph);drawing_color(rgb(0,0,0));
    loop
        if(mydraw>0)delete_draw(mydraw);end
        map_clear(0,graph,rgb(255,255,255));
        mydraw=draw_line(320,240,father.x,father.y);
    frame;
    end
end