[VB程序设计创新实验教程]Chap1---VB中游戏基本要素的实现方式[1]

王朝vb·作者佚名  2006-04-16
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VB中游戏基本要素的实现方式[1]

By EmilMatthew

06/04/14

1游戏画面运动的主体框架:

一个有意思点的游戏的成功关键在于能”动”,而在“动”的实现方法中,最简单易行的就是外层循环加内层的延时及更新的的操作.

为了达到精确的定时,可以用一个WIN32的API GetTickCount来计时,在正常条件下,精度可达1毫秒。

Option Explicit

Public Declare Function GetTickCount Lib "kernel32" () As Long

Const MS_DELAY = 50 '20FPS

‘valuable declare

Dim mblnRunning As Boolean

Dim mlngTimer As Long

Dim mStartTime As Long

Dim mDelayTime As Long

‘init data

Public Function sample()

mblnRunning = True ‘flag

mDelayTime=20000 ‘20secs

mStartTime= GetTickCount()

mlngTimer= GetTickCount()

‘main part

Do While mblnRunning And GetTickCount()<=mStartTime+mDelayTime

If mlngTimer + MS_DELAY <= GetTickCount() Then

mlngTimer = GetTickCount() ‘update time limit

'------------------------------------------------

‘motion effects doing and updating here

‘-----------------------------------------------

End If

DoEvents 'Important . If not add this ,the effect will be very bad.

Loop

End Function

在motion effects doing and updating here可以加入运动更新的代码

如cmd.left=cmd.left+1,就可以产生一个command控件从左向右的移动效果。

2画点或画线:

最简单的方式,就是使用PictureBox或Form控件提供的Line,Circle,PSet来进行绘制.

Sub Line(Flags As Integer, X1 As Single, Y1 As Single, X2 As Single, Y2 As Single, Color As Long)

Sub Circle(Step As Integer, X As Single, Y As Single, Radius As Single, Color As Long, Start As Single, End As Single, Aspect As Single)

Sub PSet(Step As Integer, X As Single, Y As Single, Color As Long)

下面给出的程序段是关于画函数f(x)= 0.5 * x ^ 3 - 3 * x ^ 2 + 3 * x图像的例子

Private Sub Form_Load()

Me.Show

Dim i As Single

Dim x0 As Integer

Dim y0 As Integer

pic.ScaleMode = 0 'user definitation

pic.ScaleHeight = 20

pic.ScaleWidth = 20

pic.Height = pic.Width

x0 = pic.ScaleWidth / 2

y0 = pic.ScaleHeight / 2

pic.Line (pic.ScaleLeft, y0)-(pic.ScaleWidth, y0), RGB(0, 0, 255)

pic.Line (x0, pic.ScaleTop)-(x0, pic.ScaleHeight), RGB(0, 0, 255)

For i = -pic.ScaleWidth / 2 To pic.ScaleWidth / 2 Step 0.005

pic.PSet (x0 + i, y0 - f_x2(i)), RGB(0, 0, 255)

Next

End Sub

Private Function f_x2(x As Single) As Single

f_x2 = 0.5 * x ^ 3 - 3 * x ^ 2 + 3 * x

End Function

效果

编程练习与思考:

1. 李萨如图形的绘制。

2. 三角函数图像的绘制。

3. 驻波的动画演示。

4. 导弹追击实验。

 
 
 
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