Drawing A Line In VB With OpenGL
Nov 6, 2010
I was wondering if anyone could steer me to any good references to using OpenGL in vb.Net? I wanted to try a simple line drawing test to start off with, and came across many old discussions about using CsGl or the Tao Framework. But I could not get CsGL to import into Net2008 (the Add Reference window simply could not see the DLL that was clearly there when using Windows Explorer). And although I could get Tao to import OK, and found portions of one person's project, I figured that somehow the GL window he was referring to had to first be set up as a GL object (new class?).In addition, all the OpenGL books I have looked at only discuss OGL with respect to some version of C.From what I have gathered, you need a connector between vb.Net and the opengl32.dll libraries and that is what CsGL and Tao are about. But the edumucation resources seem very few.
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Sep 3, 2010
I'm working on a game engine, and I want to be able to draw a billboarded (i.e. rectangular to the screen) quad with the center-bottom of the quad being determined by a single point.
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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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Jan 22, 2011
if i use
Dim Gr As Graphics = SomePanel.CreateGraphics()
Gr.Drawline(StartingPoint, EndingPoint)
I want to be able to have a line drawn from point a to b, but be able to rate it 90 degress based on user input so if the user inputs 70 I want it to rotate 30 degree's to simulate a 70 deg relationship to a horizontal line that it touches if that makes any sense. a is starting point b is the user inputs 70 and it draws it at 70 in relationship to the horizontal lineheres the image that i forgot to post above Attached image(s)
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Feb 24, 2012
how to draw in vb.net, 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
[Code]...
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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
a mouse click and then an endpoint as a mouse click just as you do on a typical cad program.
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May 30, 2011
That's vertical and 1 pixel wide. This is for a mulitiprocessor performance monitor.How do I do it....if you tell me which routine to use... I'll take it from there. I don't think the routine is
System.Drawing.Graphics.DrawLine, because it's looks to an external reference like I'm putting random pixels in.If possible I need to put the pixels in by hand. Besides this line of pixeld is another line of pixels for another epoch. They are not related numrically.
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May 27, 2010
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)
[Code]....
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Dec 12, 2011
I am doing a project with graph (VB.NET). I am drawing a line handling dynamic property ( opacity changes based on DB value). I don't know how to change the opacity.
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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?
Example:
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
[Code]....
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
[Code]...
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Jan 25, 2012
Basically I want to Position a line from The middle of my screen to the bottom right of my screen. But I need to draw over the game to do this. I dont mind if it flickers as long as its there is all i want. Like this VV
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Mar 17, 2011
I'm trying to make a very simple Silverlight application.I want it to be full-screen, and I want to draw a line onto a Canvas.My problem is that the .Width and .Height of the canvas never seem to have a valid value. The website shows the canvas at 400x300 pixels or so, and when you click on it, it goes into Fullscreen mode.I want to use the Height and Width to find the usable space of the screen. I've tried adding events (thinking that the canvas wasn't yet ready to be used immediate after the full-screen line of code) but the LayoutChanged and Resized events don't seem to yield anything.
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Apr 13, 2009
I would like to build a line chart which can redraw or change during a period of time with dynamic data. So that the x, y axis will change if out of range. The graph may be somehow similar to Matlab. I am using vs2005.
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Apr 13, 2012
Problem drawing dotted path lines, with even dots along the path line.I want to draw a path line that can be any shape (square, round, outline etc), and along this path line I want even dots to appear.
I also want to be able to resize the shape (as in the example attached)This is very easy to do using "DrawPath" and defining points for the path and using a pen defined as dots.The problem I have is I want the dots to be evenly placed along the path, on any shape or size I draw.In the example I have created, I create a square with 4 points and draw a dotted path.There are 2 buttons that allows me to resize the square (larger or smaller) this helps show the problem more clearly.
The path starts at the top left corner and finishes back at the top left corner, the dots are evenly placed along the path, except the final dots at the end of the path. (Sometimes the dots are even and other times they are not even).The shapes I want to draw can be any size and any shape, but I have used a square in this example to show the problem I have. point me in the direction I need to go that allows me to draw the dots and give the impression that they are even all along the path, for all shapes and sizes.
In the pictures below if you change the size of the shape, one will have even looking dots, the other will not.
[Code]...
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Feb 24, 2009
I want to add opengl to my vb.
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Feb 17, 2012
I was trying to learn how to do openGL within a VB .NET environment and it seems that the Tao framework or OpenTK is recommended with OpenTK having a higher recommendation so that is what I chose to try using. Since I am brand new to this, I am trying to just draw a simple box, triangle, or anything really so that I can understand it all before making more complex things. I have been unsuccessful at this so far so I will list in order what I have done so far and hopefully someone here can help me correct it or provide a new example just so I can draw a simple shape.
1) I installed OpenTK using opentk-2010-10-06.exe
2) In a new project I added the references to OpenTK.dll and OpenTK.Compatibility.dll
3) I added the control (opentk.glcontrol.dll)
4) I added the actual control to my form.Using some examples online I added the rest:
5) I wrote my references in:
Imports OpenTK
Imports OpenTK.GLControl
Imports OpenTK.Platform
[code]....
The above results in no display?
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Sep 13, 2011
I wanted to install visual Basic or C++ (but Basic really seems easyer to use) with DirectX or OpenGL but I can't get it to work!I've tried Visual Basic Express 2008 and 2010 and i'm getting the same type of errors...
-> Directx
When I try this program [URL]with VB I either get
with 2008 : just a red cross on a blank screen
with 2010 : an unlimited waiting time, and when i click i get an error message that tells me to continue waiting, im forced to CTRL -ALT - DEL to shut down VB.
-> OpenGL:So i've tried a lot of times! they tell me that it's already installed on windows so i don't need any installation but then VB gives me alot of errors, telling me that some part of code isnt recognized!!
i've tried tutorials with Csgl or Tao, but none seem to work...I already got some knowlege of OpenGL but not DirectX, so could anyone please tell me which one does work on my computer and is best for creating a graphics window inside an API that i create, for instance a mob maker?
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Apr 6, 2011
how to write program based on OpenGL in VS? cause when i begine debugging ,it says library not found..
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Jan 31, 2009
i want to do a graphics project in Vb.net but have to use OpenGl Libraries . How do i download compatible OpenGl package and how to use them in my .net code.
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Oct 9, 2010
I render a complex shape in OpenGL which requires a lot of calculations, is there anyway to export that to a state like a model that can be opened again later given you wont edit it again?
I can't create them outside the program (with something like Blender) since the shape is computed when the program starts. The render then gets translated, rotated, drawn over, etc. Note, that I don't need to edit the shape though, but I do want it in a 3D state so saving an image isn't an option.
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Aug 3, 2010
i heard OpenGL is 3D and it can be used in visual basic for models and games. Now i dont know if OpenGl is a contol or coding script. But i want to know how to make a simple model in OpenGl in visual basic.
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Jan 4, 2011
I am trying to create a tool to make terrains for my game and would like to develop it in Visual Basic Express 2010. I want to use OpenGL but am having trouble.1. Will VB support OpenGL 3.x or higher?
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Nov 12, 2010
I am running into the strangest problem that I just can't place my finger on. I've been developing an application in VB.net for the last couple months in Windows 7. The program involves some basic OpenGL drawing and animation with basic shapes (squares and circles) and basic textures mapped onto pointlists. The time has come to distribute the program to another machine. On some machines though, I encounter problems when I'm drawing textures. I know that openGL is still functional because drawing basic squares and circles still occur, the textured objects are the only things missing.
[Code]...
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Jun 22, 2010
i have to do a college project on this platform so i decided to learn open GL. while working with glui i am facing some problems. i downloaded glui-2.36. I thought of starting with the example1 (code added at bottom of the post) that was included in source folder of glui-2.36. i am using VB.net 2008 When i build the project it gives me 3 errors:
error C2661: 'GLUI_Checkbox::GLUI_Checkbox' : no overloaded function takes 3 arguments
error C2661: 'GLUI_Spinner::GLUI_Spinner' : no overloaded function takes 3 arguments
error C2227: left of '->set_int_limits' must point to class/struct/union/generic type
Here is cpp code:
#include <string.h>
#include <GL/glui.h>
/** These are the live variables passed into GLUI ***/
int wireframe = 0;
[code]....
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Oct 19, 2010
I'm currently running into a problem regarding animation in OpenGL. I have between 200 and 10000 gears on the screen at a time all rotating. When the window is not in maximized view, my CPU runs at about 10-20 % consistently. No spikes, no stuttering in the animation, it runs perfectly smooth regardless of the number of gears on screen. When I maximize the window though, everything falls apart. My CPU maxes out, I begin getting weird spikes in CPU usage, the animation begins stuttering as a result, and it just looks really ugly, even when I have only 200 gears on screen.
My animation technique looks like this:
While Animating
Calculate current rotation angle based on a running timer
draw Image
call glFlush()
End While
I'm using the Tao framework in VB.net. I'm not performing any other calculations other than the ones to calculate the rotation angle mentioned above and perform a few glRotateD and glscaleD in the method to draw the image.
In addition, I guess I was under the impression that regardless of the window size in an orthographic 2-dimensional drawing that is scaling on resizing of the window, the drawing time would always take the same amount of time. Is this a correct assumption?
Note that I've seen the animation run perfectly smooth at full screen before. Every once in awhile, OpenGL will decide it's happy and run perfectly at full screen using between 10-20% of the CPU (same as when not maximized). I haven't pinpointed what causes this though, because it will run one time perfectly, then without changing anything, I will run it again and encounter the choppiness. I simply want to pinpoint what causes the animation to slow down and eliminate it.
I've run a dot trace on my program and it says that the swapBuffers method is using 55 % of my processing time even though I'm never explicitly calling the method. Is the method called by something else that I can eliminate, or is this simply OpenGL's "dead time" method to limit the animation to 60 fps?
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Jun 3, 2012
draw individual pixels, without resorting to drawing a line and setting it's length to 1. Is there an actual ability to draw a pixel that is just 1 pixel big?
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Sep 28, 2011
make a openGL overlay so for an examplei play a game and when i click shift + tab then the game will fade and my application will be seen but without minimizing the game
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Jul 26, 2011
Does anybody know how I can render openGL into a Visual Basic 2010 picture box?If you havent already done so please delete the abusive posts that responded to my original enquiries. I have decided to start a new thread on this subject rather than in an existing thread because it's more convinient for me.
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