14

How to convert closed bezier curves to Bitmaps?

 3 years ago
source link: https://www.codesd.com/item/how-to-convert-closed-bezier-curves-to-bitmaps.html
Go to the source link to view the article. You can view the picture content, updated content and better typesetting reading experience. If the link is broken, please click the button below to view the snapshot at that time.
neoserver,ios ssh client

How to convert closed bezier curves to Bitmaps?

advertisements

I need an algorithm to convert a closed bezier curve (perhaps self-crossing) to a binary bitmap: 0 for inside pixels and 1 for outside. I'm writing a code that needs to implement some operations on bezier curves, could anybody give me some resources or tutorials about beziere? Wikipedia and others didn't say anything about optimization, subtracting, union, knot insertion and deletion and other operations :-)

alt text http://www.imagechicken.com/uploads/1271001073057545100.jpg


This paper by Charles Loop and Jim Blinn goes into lots of detail on your question.

Another option is to tessellate the Bezier curve into line segments and then use your favorite polygon fill algorithm.

Related Articles

Detection of self-crossing in closed Bezier curves

I've created a "blob" shape by patching cubic Bezier curves together (screenshot below). I'd like to be able to detect the situation where a curve has crossed over either itself or another curve and was wondering if there's a recommended approac

How to draw Quadratic Bezier curves in phase 3d? Should I divide them into segments?

I am currently using the native .curveTo function and wondering if I could write some code that will render Quadratic Bezier Curves in Stage3D? I also may need to perform fills between the curves I draw to the screen.Fills are supported by the extens

How to convert a Drawable to a Bitmap?

I would like to set a certain Drawable as the device's wallpaper, but all wallpaper functions accept Bitmaps only. I cannot use WallpaperManager because I'm pre 2.1. Also, my drawables are downloaded from the web and do not reside in R.drawable.This

Evaluation of the Bezier curve

I am following this paper here using de Casteljau's Algorithm http://www.cgafaq.info/wiki/B%C3%A9zier_curve_evaluation and I have tried using the topic Drawing Bezier curves using De Casteljau Algorithm in C++ , OpenGL to help. No success. My bezier

How to convert a bitmap icon into Android?

This question already has an answer here: How to convert a Drawable to a Bitmap? 14 answers I want to convert a Icon to Bitmap object in android. My goal is to convert from Notification Icon to bitmap. What should i do?? Thank you for all the answers

How can you draw a four bezier curve with wxPython?

It appears to me that the DC's only support for curves of any sort is with splines. Are there any libraries that add bezier functionality, or is there a way to convert a bezier curve into a spline?Given 4 control points, the formula for the associate

An algorithm to find the closed box bezier curve box?

I'm looking for an algorithm to find bounding box (max/min points) of a closed quadratic bezier curve in Cartesian axis: input: C (a closed bezier curve) output: A B C D points Image http://www.imagechicken.com/uploads/1270586513022388700.jpg Note: a

how to make a parallel bezier curve heuristically

I have only found this blog with a relevant answer http://seant23.wordpress.com/2010/11/12/offset-bezier-curves/ ,but unfortunately i don't know the language and can't understand the maths behind it. What i need is to know how to make a bezier curve

How can I find the angle between two points on a Bezier curve?

In my current OpenGL project I am trying to make the links of a chain hug the contours of a Bezier curve. How can I find the angle between two points on the curve so that I can position the links of the chain so that they follow the curve. Here is a

How to convert text to bitmap in Android

please help me to draw a text with rounded rectangle as background. I have to draw many texts on a canvas and the text has rounded background. SO what I am trying is to write a function "createTextBitmap" which return a bitmap image so that we c

How to convert any image to bitmap image and store it in the MySQL database using PHP?

How to convert any image to bitmap image and store in MySQL database using PHP? I want to store an image in a database. How to convert any images to bitmap image. <?php $target_dir = "uploads/"; $target_file = $target_dir . basename($_FILES[&

How to convert a bitmap image to Uri

I have not found the answer to this question anywhere. The Bitmap Image is processed in The application, meaning there is no File path to get the Image. Below is how to convert a Uri to Bitmap if (requestCode == RC_PHOTO_PICKER && resultCode == RE

How to convert a bitmap file to an image file with Android

I wanna read a file full of bmp resource and show it on my android app. But know idea how to do this, I put my file under resets folder. The file looks like this <image id="labelThumbnail" xmlns:xlink="http://www.w3.org/1999/xlink"

How to convert Windows Bitmap to Actionscript Bitmap in C ++

to circumvent some (a lot) of problems with the Actionscript Camera API on Windows 8 Systems, I decided to create a native extension to deal with the camera. Right now, the camera part and all the glue to communicate with the AIR Runtime is actually

About Joyk


Aggregate valuable and interesting links.
Joyk means Joy of geeK