Part Of The Line Goes Below 0 It Starts Drawing The Line Inverted Again?

Dec 3, 2010

This is more of a mathematical problem than programming problem.I have created a very basic 3D engine using Visual Basic .Net. It displays lines on the screen with an additional z axis. The engine works, however when part of the line goes below 0 it messes up and starts drawing the line inverted again.

This is how it calculates the points:

y = (point.y / z) + offset.y + camera.y
x = (point.x / z) + offset.x + camera.x

Can anyone work out a way to only draw part of the line when it intersects the z=0 axis?


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Oct 21, 2009

I am making a program that loads files into a ListBox, loops through each one, and if the last line of the file begins with "@", it removes that last line.Now, I am not really sure how to do this.Would I use LineReader?How would I check the first character?

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Is it possible to draw text on a Graphics object that inverts what it's drawn on?

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Oct 14, 2011

what i need to do is open a txt file, read line by line, decode each line into an array and display. Now all works ok apart from one line.

sTextLine = objReader.ReadLine() <-- Value of string cannot be converted.

full code here
Dim objReader As New System.IO.StreamReader(sOpenFile.Text)
Dim sTextLine As New ArrayList()
Dim sText As String = ""
Dim i As Integer = 0


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Jan 16, 2011

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Dec 1, 2011

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"bob" "cat" "1243"
"steve" dog" "6789"

I've started this with this code but not sure how to go about the next stage:

Using MyReader As New _
Microsoft.VisualBasic.FileIO.TextFieldParser(My.Application.Info.DirectoryPath & "Records28112011.jd")
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Jul 5, 2010

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Dim line, lines() As String
lines = TextBox1.Text.Split(Environment.NewLine)
Dim i As Integer = 0


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Jan 22, 2011

if i use

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Nov 6, 2010

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Feb 24, 2012

how to draw in, and I figured the easiest way is to get my hands dirty and start coding. I figure that the best way to start is by drawing a line on the form. What I'm trying to do is use the graphics.drawline(), but I'm failing. This is what I'm using so far


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May 13, 2009

I have a question about drawing lines. Most of the code snippets I've seen approach drawing a line with the mouse down as the startpoint and the mouse up as the endpoint. But I am trying to draw a line by startpoint as
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My program is giving the error: "End of statement expected" The red lines are the ones giving errors. I'm trying to draw lines on a picturebox to create a graph

Dim iScale As Single
Const Distance = 1000
pictureBoxGraph.ForeColor = QBColor(0)


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Nov 29, 2010

I'm using vb10. 

Is it possible when drawing a line to use a binary pattern? Is there a command for this?


167 is 1010 0111
Draw a line X32 x Y1 would be: 10100111101001111010011110100111
205 is 1100 1101
Draw a line X32 x Y1 would be : 11001101110011011100110111001101

1's being pixels drawn and 0's not.

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Jan 18, 2012

I have been working on an angle calculating program. I have incorprated a feature so you can type the angle and the program draw it. I have since added a few new features and updated everything as such. For the life of me I can't figure out why the draw angle has stoped working. let me just paste some code.

Imports System.Collections.Generic
Imports System.ComponentModel
Imports System.Data


Right, the program isn't so complicated. The important bit is that you type an angle in textbox1 and hit enter. Then what happens is the angle is calculated against a base line (one of the new features is that this base line can be moved from left to right and center.) the problem occurs when you hit enter, the program doesnt actually draw the line for you.

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Jun 21, 2010

I'm writting program in VB 2010, but I have a problem. I want to draw a temporary line on PictureBox control MouseMove event. That works fine but deleting of that line doesn't work. I tried to draw the white line on the same coordinates (PictureBox's background is white), but won't work.

Here is the code: Private Sub drawing_MouseMove(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles drawing.MouseMove


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Jan 25, 2012

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Sep 16, 2010

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Dim myStream As Stream = Nothing


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Mar 17, 2011

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Feb 7, 2011

a user copies multiple lines of text (say, from an email) into the clipboard. Based on my observations, when one tries to paste the text into a single-line textbox, only the first line is actually pasted in.  (I am aware that the "obvious" solution would be to set the Multiline property to True, but there are reasons I am looking to avoid this and to put multi-line data into a single line.)

In the TextChanged event handler, I wrote code that parses the clipboard data to successfully convert it to a single-line, comma-delimited format.

Private Sub txtMassTrackingNo_TextChanged(ByVal sender As Object, ByVal e As System.EventArgs) _
Handles txtMassTrackingNo.TextChanged


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Is there a way to show the line number of the line of code that caused an exception within a Try...Catch block?

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Dim Btn As Button = DirectCast(sender, Button)
Dim path As String = Application.StartupPath & "Libraries" & Btn.Text.Replace(" ", "_") & ".ipt"
Dim i As Integer = 0
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I'm having trouble with reading a .txt file line by line, converting it into a string, then putting it into a listbox. When I execute I get an error saying "IndexOutOfRangeException was unhandled" Here is my


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Jul 8, 2010

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<?xml version="1.0" encoding="utf-8"?><MainSite><MainSites Found="201" Returned="20" Status="0"><Site SID="123456"><Relevance>0.985</Relevance><Title>JDoe</Title><DateModified Date="2010-01-29T01:05:00">1/29/2010</DateModified><DateCreated Date="2010-01-29T01:05:00">1/29/2010</DateCreated><PersonalData><Confidential>0</Confidential><Name><First>John</First><Middle>


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textbox3 line2 = textbox1 line2 + textbox2 line2
textbox3 line3 = textbox1 line3 + textbox2 line3
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When a line is biger than the size of the richtextbox, it wraps it. This create a big problem as I can not select the last line of the richtextbox (when a line is wrapped it becomes two lines). When I set wordwrap to off it works just fine 

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