Game Development Reference
In-Depth Information
position to 0,0 and change
Content size
to use
%
types and
100
as the value for both width
and height. This expands the color node to fill the screen.
If you run this in the game and tap the pause button, suddenly your game view disappears.
This is because you are looking at a full-screen popover menu with a solid color back-
ground. If you prefer, you can also use a
Gradient Node
instead of the color node.
Tip
If you notice lag due to low framerate when displaying such a full-screen
popover, simply set the
visible
property of the
_levelNode
in the back-
ground to
NO
. This will prevent it from being rendered behind the popover, im-
proving rendering performance.
But wait, there's more to it! In addition to a full-screen popover, you can also dim the
level view while the popover is presented. This is easily achieved by changing the color
node's
Color
property to black and then setting its
Opacity
to about
0.5
.
You can also play with the color node's
Blend src
and
Blend dst
settings to create
additional effects. Try setting
Blend src
to
One
and
Blend dst
to
One - Dst
Color
to get false colors. Try changing the color node's color and opacity, too.
Or set
Blend src
to
One - Dst Color
and
Blend dst
to
Src Alpha Sat-
urate
with
Opacity
set to
1
and white color to create a photo-negative effect as shown
in
Figure 6-7
.
Figure 6-7
.
The PauseMenuLayer presented in the game with a photo-negative effect applied by using blend
modes
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