How to resolve the algorithm Bitmap/Bézier curves/Cubic step by step in the zkl programming language

Published on 12 May 2024 09:40 PM
#Zkl

How to resolve the algorithm Bitmap/Bézier curves/Cubic step by step in the zkl programming language

Table of Contents

Problem Statement

Using the data storage type defined on this page for raster images, and the draw_line function defined in this other one, draw a cubic bezier curve (definition on Wikipedia).

Let's start with the solution:

Step by Step solution about How to resolve the algorithm Bitmap/Bézier curves/Cubic step by step in the zkl programming language

Source code in the zkl programming language

   fcn cBezier(p0x,p0y, p1x,p1y, p2x,p2y, p3x,p3y, rgb, numPts=500){
      numPts.pump(Void,'wrap(t){ // B(t)
      	 t=t.toFloat()/numPts; t1:=(1.0 - t);
	 a:=t1*t1*t1; b:=t*t1*t1*3; c:=t1*t*t*3; d:=t*t*t;
	 x:=a*p0x + b*p1x + c*p2x + d*p3x + 0.5;
	 y:=a*p0y + b*p1y + c*p2y + d*p3y + 0.5;
	 __sSet(rgb,x,y);
      });
   }

bitmap:=PPM(200,150,0xff|ff|ff);
bitmap.cBezier(0,149, 30,50, 120,130, 160,30, 0);
bitmap.write(File("foo.ppm","wb"));

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