Point Inside A Triangle Or Not
Mar 10, 2009
i was asked to do a program which can find if a 2d point is inside a triangle or not, only the 3 points of the triangle were given. i planned to do this using the slopes of the 3 sides, then with y-y1=m(x-x1) using the other vertex and the point being checked see if the slope was the same sign and on the same side of the line. if this was true for all 3 then the point is inside the triangle the problem is i cant think of a logical expression for the if/then/else structure to show this anyone know what i should use or should i just go down a completely different route?
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Mar 30, 2012
assuming i have an isoceles triangle, where i know the height + base width, how
can i calculate the width of that triangle at 1/3 of the distance from the point + 2/3 of the distance from the point?
i thought it'd be simply 1/3 base width + 2/3 base width, but my drawing is +/- a few pixels when i resize it?
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Jul 22, 2011
Everyone knows of the yellow triangle with a exclamation point in it on a message box. I would like to use that same image on one of my forms. Is this possible? If so, how do I do it?
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Jun 4, 2009
I hve been working with points a lot recently, and I have been wondering if there is a way to set a point without setting point.x and point.y separately. For example for (3, 5): Point1 = (3, 5) But that isn't right
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Feb 14, 2011
I have a Diagonal line drawn on a picture box on my forum and i need to know if the user has clicked the line I have the Start point and End Point of the Line and the mouse x,y location So i basically need to find out if the x,y of the mouse is on the line.
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Dec 31, 2010
I'm trying to extract a piece of text from within the string, defining both a starting point and an ending point. For instance, say I want to search for the text found between "That is a " and " car" in the string "That is a red car", so it would return "red".I know you can use .SelectionStart and SelectionLength, but the length of the word can change, so the selection length can vary. What I want is to establish a specific starting point and a specific ending point from which to extract the text from the string.
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May 24, 2010
I want to know if its possible to loop in a variable and grab info from point a to point b
This is what I have stored in my Variable
PHP
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[Code].....
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Jul 29, 2009
i have a picturebox which displays a map i have 2 modes add point and delete point when the user clicks the picture it creates a point on the picture where the user has clicked that works perfectly its when i try and delete the point when it doesent work :/ i have all the points loading from an xml file this is the code i have:
[Code]...
basicly i want it to when the user clicks the point it fines the x any y in the xml delete the node then delete all the points on the map then reload them all according to the xml
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Mar 11, 2012
I'm trying to calculate the direction between two points on a two-dimensional grid. Actually I want to determine if that vector is within a range of two values. Suppose the grid's origin is 0,0 at the upper left corner, and 0 degrees represents north. I have a point A on that grid. I want to know if a line from point A to point B on the grid is within a range of directions between 111.8 degrees (a little south of east) and 158.2 (a little east of south). Those are approximations; the 111.8 is 90 degrees plus the arctangent of 2/5, and 158.2 is 180 minus that value. I worked out a series of calculations worthy of a medieval astronomer, but I suspect there is a simpler way. I'm going to have to do this for a variety of other vectors, and I'd like to generalize
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Feb 20, 2010
I know how I can construct an icon setting point by point, but that isn't what I want. I want to use a bitmap file or a jpeg -is easy to convert an jpeg to an bitmap- and built an icon that looks like this picture.
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Jan 17, 2009
I want to make a drawing application which needs a few drawing functions I cant handle myself as im not very mathematicly inclined The first on the list of functions is to create an arc from a start point, end point and radius. The method signature is as followes.
Function CreateArc(byval StartPoint as PointF, EndPoint as PointF, Raduis as single) As PointF()
'Code to create an array of points...
[Code]....
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Apr 10, 2012
I have a DataGridView that will occasionally have a RowError icon displayed in the RowHeader (shown below)I have code that displays a small form when the users mouse moves over the row header or clicks the row header.I would like to draw aline from the top-left of the form to the middle-right of the row header.I basically want to point from the form to the error icon.
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Mar 14, 2009
I need to move an ellipse from a known point on the screen to another known point on the screen.
I've tried using For.....Loops with less than desired results.
I can't remember everything I've tried, a lot of trial and error has been layed to waste. Lol
I've ended up with this code after putting together what I've tried, what I've learned elsewhere, and a couple of posts I've read on here.
All I want to do is move the ellipse from one point to the other along a straight line that forms the angle between the two points (X1,Y1) and (X2,Y2), make it grow from 2 pixels at it's start, to about 80 pixels by the time it reaches half way, then shrink from 80 pixels back down to 2 pixels by the time it reaches the point (X2,Y2).
Easier said than done.
Here's what I have at the present.....
Dim W As Integer
Dim H As Integer
Dim Num As Integer
[Code].....
....This seems like such a simple task, yet it's been a week since I came up with the idea, and I've had little success.
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May 9, 2010
come out with the codes for moving the mouse pointer from point (200, 100) to point (300, 400), repeatedly. Using VB 2008.
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Jul 28, 2010
I looked around the forum can't find something really simple.I want to scrape everything between the
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to
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copy it and use it right after it's website and I navigate using webbrowser1.
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Jun 21, 2010
i want to work on a shooting game,and i already have a code for the rotation of the image but i have a few problemFirst problem(for the tank /ship): i want the image to AUTOMATICALLY rotate facing the mouse cursor,i know how to rotate but but i dont know how to convert the location of the mouse to an angle that the image will face,,
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Feb 1, 2010
I'm creating a movable scenary with, like 100 different flights. I want to create for every type of flight a triangle...so it's moves around and you have an idea how the airspace looksq like at what moment.Now my question is, what's the best way to draw these rectangles? I created a class 'Flight' and it has a Graphicspath in it. Now I want to update the triangle, which represents the aircraft, with the speed and heading...so it moves around well.
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Mar 20, 2010
Dim blackPen As New Pen(Color.Black, 3)
Dim ptsArray As PointF() = {New PointF(100.0F, 120.0F), New PointF(70.0F, 60.0F), _
New PointF(40.0F, 120.0F), New PointF(100.0F, 120.0F)}
e.Graphics.DrawLines(blackPen, ptsArray)
I have the outline of a triangle right where I want it. I need to fill it so it's a solid color. Can anyone give me a start on filling it? (Using VB.NET 2008)
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Jun 18, 2009
How do I draw a triangle?
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Nov 24, 2010
Currently working on a 2D engine, not for gaming but for design software / visualisation for machines. So far it is comming along quite fine. I started to wonder if it were possible to draw a triangle and fill it with some form of a a texture, or even better a polygon and fill that with a texture.
I know that DX can do that for me :P but I am realy focussing on GDI+ at the moment.
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Nov 9, 2009
How can i calculate the angles of a triangle, where i have the lengths in cm of all 3 sides?
heres an example where i already know the angles. i know its a sin, cos or tan formula, but nothing i've tried works.
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Nov 12, 2009
How to draw a right triangle and spherical triangle using vb.net 2008? Where you're going to consider the angles and sides of the triangles.......
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Sep 19, 2007
triangle of stars like the one shown below
*
* *
* * *
* * * *
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Apr 14, 2011
I am taking an Intro to VB class in college and for on of our assignments we need to make several shapes with *'s. The user is prompted by an input box where they decide how large to make the shapes. The only one that I am struggling with is the inverted triangle. Here is what it should look like if the user would select to have 5 rows.
* * * * *
* * * *
* * *
* *
*
Here is the code that I have written for the REGULAR triangle.
Private Sub btnTriangle_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnTriangle.Click
Dim numstars As Integer
[Code].....
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Jan 7, 2012
make an INVERTED triangle with *'s
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Jun 10, 2010
I need to figure out how to print a triangle on a console application such that it looks as follows:
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Nov 17, 2011
I have a menu strip on a form and to assist the users and to make it more aesthetically pleasing I want to add an inverted triangle at the end of each menu title to make it more obvious there are other options available if you click on it.I am currently using Times New Roman as a font but that can be changed if necessary.
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Mar 30, 2012
i'm trying to create an asterisks triangle in a richtextbox. the design that i need is
---------*
--------**
-------***
[code]....
all the way down to 10 asterisk at the bottom and 9 spaces a 1 asterisks at the top. I'm a beginner to visual basic and coding in general.
The code that i have right now is:
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
Dim Stars, Lines As Integer
[Code]....
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Sep 26, 2009
i'm trying to draw a random triangle in a timer, + draw an arc + the angle in degrees in each angle. i can't get drawarc working.
heres my code:
Public Class Form1
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
[Code].....
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Dec 28, 2010
How to edit my Form1's shape like triangle
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