Game Development Reference
In-Depth Information
using
Microsoft.Xna.Framework;
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using
Microsoft.Xna.Framework.Input;
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3
4
class
RowSelectGameObject : SpriteGameObject
{
5
protected int
selectedRow;
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7
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public
RowSelectGameObject(
int
layer = 0,
string
id = "")
:
base
("spr_selector_frame", layer, id)
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{
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selectedRow = 0;
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}
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13
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public override void
HandleInput(InputHelper inputHelper)
{
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JewelGrid grid = GameWorld.Find("grid")
as
JewelGrid;
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17
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if
(inputHelper.KeyPressed(Keys.Up))
−−
;
selectedRow
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else if
(inputHelper.KeyPressed(Keys.Down))
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selectedRow++;
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−
1);
selectedRow = (
int
)MathHelper.Clamp(selectedRow, 0, grid.Rows
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−
10, grid.CellHeight
∗
selectedRow
−
10);
this
.position =
new
Vector2(
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24
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if
(inputHelper.KeyPressed(Keys.Left))
grid.ShiftRowLeft(selectedRow);
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else if
(inputHelper.KeyPressed(Keys.Right))
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grid.ShiftRowRight(selectedRow);
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}
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}
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Listing 16.1
A new version of the row selection game object that uses the identifier system to find
game objects in the game world
be written and the font that is used. Finally, we also want to be able to change the
color
of the text that is displayed. Therefore, the
TextGameObject
class has at least
the following member variables:
protected
SpriteFont spriteFont;
protected
Color color;
protected string
text;
We can then override the
Draw
method to write text on the screen, which is done by
calling the
DrawString
method from the
SpriteBatch
class:
