Draw Rectangle between two points with arbitrary width

jeya pandi

Hi,

I want to draw rectangle beween two points with arbitary width.when i change starting point or end point rectangle also need to be change.It looks like the below url image https://i.stack.imgur.com/vyQD2.gif. Please any one provide suggestions to how to acheive this.Thanks in advance.

1 Reply

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Rajkiran Swain9y ago
Accepted answer
We need to calculate 2 values, the shift on the x axis and the shift on the y axis for each of the 4 corners. Which is easy enough.
The dimensions of the line are:
```
width = x2 - x1  height = y2 - y1
```
Now the x shift (let's call it xS):
```
xS = (thickness * height / length of line) / 2  yS = (thickness * width / length of line) / 2
```
To find the length of the line, use Pythagoras's theorem:
```
length = square_root(width * width + height * height)
```
Now you have the x shift and y shift.
```
First coordinate is: (x1 - xS, y1 + yS)  Second: (x1 + xS, y1 - yS)  Third: (x2 + xS, y2 - yS)  Fourth: (x2 - xS, y2 + yS)
```
And there you go! (Those coordinates are drawn counterclockwise, the default for OpenGL)