Showpoly Explain

[Emera]

I really want to lean towards using images and shapes in my scripts. I thought a good place to start was showpoly. I searched the graal wiki and I didn't find anything that can help me. Maybe you guys can?

[fowlplay4]

There's not a lot to it:

PHP Code:

//#CLIENTSIDE
function onCreated() {
  setTimer(0.05);
}

function onTimeout() {
  showPolygon();
  setTimer(0.05);
}

// Draw square on mousex and mousey position.
function showPolygon() {
  // using showpoly
  showpoly(200, {
     mousex, mousey,
     mousex + 2, mousey,
     mousex + 2, mousey + 2,
     mousex, mousey + 2
  });

  // Same as doing
  with (findimg(200)) {
    polygon = {
     mousex, mousey,
     mousex + 2, mousey,
     mousex + 2, mousey + 2,
     mousex, mousey + 2
    });
  }
} 


The polygon array is just a collection of x, y points listed in order. I.e: {x1, y1, x2, y2, x3, y3, x4, y4};

You can use as many points as you want. I think you need at least 3 sets of x,y points though. Used to be able to draw lines with just two but i believe that changed with V5.

Other Reading:
http://gscript.graal.net/showpoly

[Crow]

Originally Posted by fowlplay4

I think you need at least 3 sets of x,y points though. Used to be able to draw lines with just two but i believe that changed with V5.

Quite sure I only got two somewhere..

[Emera]

Takes some fiddling to get the shape you want.

[Tricxta]

Not really,what you do is you plot the outline of the points you want:
Square example:

PHP Code:

temp.square={20,20,40,20,40,40,20,40};
showpoly (300, temp.square); 


And this is how I drew it in order of verticies


Another example would be drawing a circle:

PHP Code:

temp.radius=4;
for (temp.i=0;temp.i<(pi*2);temp.i++)temp.circle.add((cos(temp.i)*temp.radius+30),(sin(temp.i)*temp.radius+30));
showpoly (300, temp.circle); 


So basically summing up, you draw the outline and the showpoly will fill in the middle. And basically what I've done here in both examples is define an array outside the showpoly statement rather then within it. Hope this helped.

[Emera]

So it is

PHP Code:

showpoly(point1x,point1y,point2x,point2y,point3x,point3y,point4x,point4y); 


Right?

[cbk1994]

Originally Posted by Emera

So it is

PHP Code:

showpoly(point1x,point1y,point2x,point2y,point3x,point3y,point4x,point4y); 


Right?

No. See the wiki page linked in Jer's post above.

[oo_jazz_oo]

Originally Posted by Crow

Quite sure I only got two somewhere..

You can use only two. :P
v5 and v6 works just fine using 2 x/y coords.

[ff7chocoboknight]

You need {}. It's an array.

showpoly(index, {x1,y1,x2,y2,...,xn,yn});

That's why Tricxta used temp.square to list the points first.

You forgot the index, too.

[gaben]

Polygons also support RGBA coloring, which is nice I guess.

PHP Code:

green = 1;
blue = 0;
red = 0;
alpha = 1; 


Would output a 'green' polygon. Not sure if you can define/initialize color vars outside of the polygon index though.

[Tricxta]

You should be able too.... just use findimg(index).