VB6 - Complete BitBlt Overview

Hi r33d3r,

Complete BitBlt Overview
Yikes! That sounds like ****! Well I won't get in to advanced since I'm quite new to BitBlt as well. (2 non-stop days of brain cracking got me my knowledge so far)
This topic will be updated with sources (for lazy people I guess, excuse me if I'm wrong ;)) and more questions.

!!! PLEASE DON'T REPLY, SEND ME A PRIVATE MESSAGE INSTEAD !!!

You should read this first!

So there we are workin' with masking and stuff.
Now we have some thing to watch out for!

I use BitBlt and the pictures need to be visible? Why!
No this isn't needed just do this:

VB Code:

Picture1.AutoRedraw = True
Picture1.Visible = False

Now BitBlt again and, see no picturebox but the BitBlt shows you what you wanted.


Masking is difficult! Is there another way to do this?
First you need to know that you COULD use masking. Though in many cases you don't need to really make things transparant. (This is a lazy way to accomplish things. ;)) Just equip the sprites with the unlayered tile now again this won't work in many occasions but sometimes this is just what we want and we don't need to do difficult masking.


My screen starts to flash a little every now and then (or worse ;))
Well this again is a AutoRedraw thing, I still can't find the use of letting this function on False but set

VB Code:

Picture1.AutoRedraw = True

then the flashes should've stopped.

Update I've added the attachment but you need to make the Form and Picture1 and Picture2!

Form1.Picture1.picture = a tiled background.
Form1.Picture2.picture = a single tile of Picture1 with a character or unit on it.

SET AutoRedraw to TRUE! On all pictureboxes ;)

On the Form1.Picture1 object KeyDown
This is the collision checking. (Very simple)

VB Code:

Private Sub Form1_KeyDown(KeyCode As Integer, Shift As Integer)
    Dim tileFree As Boolean
    Dim iCur As Long
    
 
    iCur = 0
    tileFree = True
    Select Case KeyCode
        Case 37
        'Left
            Do Until iCur = 255 Or tileFree = False
                If tBush(iCur).iY = tUnit.iY Then If tBush(iCur).iX = tUnit.iX - 16 Then tileFree = False
                iCur = iCur + 1
            Loop
            If tileFree = True Then tUnit.iX = tUnit.iX - 16
        Case 38
        'Up
            Do Until iCur = 255 Or tileFree = False
                If tBush(iCur).iX = tUnit.iX Then If tBush(iCur).iY = tUnit.iY - 16 Then tileFree = False
                iCur = iCur + 1
            Loop
            If tileFree = True Then tUnit.iY = tUnit.iY - 16
        Case 39
        'Right
            Do Until iCur = 255 Or tileFree = False
                If tBush(iCur).iY = tUnit.iY Then If tBush(iCur).iX = tUnit.iX + 16 Then tileFree = False
                iCur = iCur + 1
            Loop
            If tileFree = True Then tUnit.iX = tUnit.iX + 16
        Case 40
        'Down
            Do Until iCur = 255 Or tileFree = False
                If tBush(iCur).iX = tUnit.iX Then If tBush(iCur).iY = tUnit.iY + 16 Then tileFree = False
                iCur = iCur + 1
            Loop
            If tileFree = True Then tUnit.iY = tUnit.iY + 16
        Case 27
            End
    End Select
End Sub

Add this to the draw function, and add a Picture3 box for the unit

VB Code:

BitBlt form1.Picture1.hDC, tUnit.iX, tUnit.iY, 16, 16, Picture3.hDC, 0, 0, vbSrcCopy

please post sorce code for this (vb code)

Frozie, he said in his first post, not to post here, but to send him a private message instead. You may want to do so.