我想画y=x,y=-x的图像,代码如下Picture1.ScaleLeft = -3
Picture1.ScaleWidth = 12
Picture1.ScaleTop = 10
Picture1.ScaleHeight = -12Dim X, Y As DoubleFor X = -6 To 9 Step 0.001
Y = X
Picture1.PSet (X, Y)
Next X
For X = -6 To 9 Step 0.001
Y = -X
Picture1.PSet (X, Y)
Next X可是为什么画出来的图像,也就是两条直线看起来不垂直的呢?
Picture1.ScaleWidth = 12
Picture1.ScaleTop = 10
Picture1.ScaleHeight = -12Dim X, Y As DoubleFor X = -6 To 9 Step 0.001
Y = X
Picture1.PSet (X, Y)
Next X
For X = -6 To 9 Step 0.001
Y = -X
Picture1.PSet (X, Y)
Next X可是为什么画出来的图像,也就是两条直线看起来不垂直的呢?
只要让Picture1.Width = Picture1.Height就可以啦
Picture1.ScaleLeft = -3
Picture1.ScaleWidth = 12
Picture1.ScaleTop = 10
Picture1.ScaleHeight = -12
Dim X, Y As Single For X = -6 To 9 Step 0.0001
Y = 5
Picture1.PSet (X, Y)
Next X
For Y = -6 To 12 Step 0.0001
X = 3
Picture1.PSet (X, Y)
Next Y
Picture1.ScaleWidth = 12
Picture1.ScaleTop = 10
Picture1.ScaleHeight = -12Dim X, Y As DoubleFor X = -6 To 9 Step 0.001
Y = X
Picture1.PSet (X, Y)
Next X
For X = -6 To 9 Step 0.001
Y = -X
Picture1.PSet (X, Y)
Next X
它只是设定坐标系上下限而已
对于坐标系的纵横比是否是正常
它不会管的还记得高中学的解析几何吗
你自己可以用解析几何知识模拟坐标系
将Picture1的ScaleMode设为vbPixelsMidX=PictureBox.ScaleWidth/2
MidY=PictureBox.ScaleHeight/2W=PictureBox.ScaleWidth/2'y=x
For I=-W To W
X=I
Y=X
Picture1.PSet (X, Y)
Next I
'y=-x
For I=-W To W
X=I
Y=-X
Picture1.PSet (X, Y)
Next I