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	'''INT''' flags		'''INT''' flags
-	Flags is a predefined [[local variable]] which is used to manipulate [[graphic|graphics]] in a [[process]].	+	Flags is a predefined [[local variable]] which is used to manipulate how the [[graphic]] of a [[process]], assigned to its local variable [[graph]], is displayed.
-	== List ==	+	To alter the effect, change the value of this local variable by assigning it [[blit flags]]. Like most [[bit flags]], constants can be added together to combine effects. A horizontally mirrored translucent graphic would need flags B_TRANSLUCENT (4) and B_HMIRROR (1), so flags = B_TRANSLUCENT|B_HMIRROR (5) will do the trick.
-	{|	+
-	| ''Value'' || - ''What it does''	+
-	|-	+
-	| 0 || - Nothing happens	+
-	|-	+
-	| 1 || - Graphic is horizontally mirrored	+
-	|-	+
-	| 2 || - Graphic is vertically mirrored	+
-	|-	+
-	| 4 || - Graphic is translucent	+
-	|}	+
-		+
-	You can add up the numbers to combine the effects. A horizontally mirrored translucent graphic would need flags 4 and 1, so flags = 5 will do the trick!	+
	== Example ==		== Example ==
	To make the graphic of a process spin:		To make the graphic of a process spin:
	<pre>		<pre>
		+	Program mirror
		+	Begin
		+	mirror_graphic();
		+	Loop
		+	frame;
		+	End
		+	End
	Process mirror_graphic()		Process mirror_graphic()
	Begin		Begin
-	graph = load_png("image.png"); //load the graphic and assign it to the graph variable	+	graph = new_map(50,50,8);
		+	map_clear(0,graph,rgb(0,255,255));
	x = 100; //Position the graphic 100 pixels		x = 100; //Position the graphic 100 pixels
	y = 100; //from the top and left of the screen		y = 100; //from the top and left of the screen
	Loop		Loop
	if (key(_l))		if (key(_l))
-	flags = 1; //if you press the L key, your graphic is horizontally mirrored	+	flags = B_HMIRROR; //if you press the L key, your graphic is horizontally mirrored
		+	else
		+	flags = 0;
	end		end
	frame;		frame;
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	End		End
	</pre>		</pre>
-	This process will mirror its graphic as soon as you press L.	+	The process will mirror its graphic when the key L is held down.

---

Revision as of 19:59, 25 June 2007

Definition

INT flags

Flags is a predefined local variable which is used to manipulate how the graphic of a process, assigned to its local variable graph, is displayed.

To alter the effect, change the value of this local variable by assigning it blit flags. Like most bit flags, constants can be added together to combine effects. A horizontally mirrored translucent graphic would need flags B_TRANSLUCENT (4) and B_HMIRROR (1), so flags = B_TRANSLUCENT|B_HMIRROR (5) will do the trick.

Example

To make the graphic of a process spin:

Program mirror
Begin
    mirror_graphic();
    Loop
        frame;
    End
End
Process mirror_graphic()
Begin
    graph = new_map(50,50,8);
    map_clear(0,graph,rgb(0,255,255));
    x = 100;     //Position the graphic 100 pixels
    y = 100;     //from the top and left of the screen
    Loop
        if (key(_l))
            flags = B_HMIRROR; //if you press the L key, your graphic is horizontally mirrored
        else
            flags = 0;
        end       
        frame;
    End
End

The process will mirror its graphic when the key L is held down.