全局参数：
private
bool
_isJumping;
private
bool
_jumpKeyDown;
private
float
_jumpHeight = 100f;
private
TimeSpan _jumpTimeSpan = TimeSpan.FromMilliseconds(500);
private
double
_jumpStartTime;
private
float
_jumpStartPosition;
|
Update中的代码：
_jumpKeyDown = Keyboard.GetState().IsKeyDown(Keys.Space);
squarePosition.Y = DoJump(squarePosition.Y, gameTime);
|
高度算法函数：
private
float
DoJump(
float
velocityY, GameTime gameTime)
{
if
(_jumpKeyDown && !_isJumping)
{
_isJumping =
true
;
_jumpStartTime = gameTime.TotalGameTime.TotalMilliseconds;
_jumpStartPosition = velocityY;
}
if
(_isJumping)
{
var
jumpTime = gameTime.TotalGameTime.TotalMilliseconds - _jumpStartTime;
var
topTime = _jumpTimeSpan.TotalMilliseconds / 2;
if
(jumpTime < _jumpTimeSpan.TotalMilliseconds)
{
if
(jumpTime > topTime)
{
velocityY =
_jumpStartPosition-_jumpHeight - Convert(-(jumpTime - topTime) * _jumpHeight / (_jumpTimeSpan.TotalMilliseconds - topTime));
}
else
{
velocityY =_jumpStartPosition+ Convert(-( jumpTime)*_jumpHeight/topTime);
}
}
else
{
_isJumping =
false
;
velocityY = _jumpStartPosition;
}
}
return
velocityY;
}
|
本文转自today4king博客园博客，原文链接：http://www.cnblogs.com/jinzhao/archive/2012/06/03/2533297.html，如需转载请自行联系原作者
