To a first approximation – which is probably good enough for plotting blocks close enough – the spiral is a circle and increment the angle by the ratio chord / radius. // value of theta corresponding to end of last coil final double thetaMax = coils * 2 * Math.PI; // How far to step … Read more
You could make use of Java 1.6’s scripting capabilities: import javax.script.*; import java.util.*; public class Main { public static void main(String[] args) throws Exception { ScriptEngine engine = new ScriptEngineManager().getEngineByName(“JavaScript”); Map<String, Object> vars = new HashMap<String, Object>(); vars.put(“x”, 2); vars.put(“y”, 1); vars.put(“z”, 3); System.out.println(“result = “+engine.eval(“x + y + z”, new SimpleBindings(vars))); } } which … Read more
Evaluate the function value You need function evaluator engine for that (it is not that hard to code) there is no way to evaluate sign only if you want to support +,- operations !!! All my function evaluators works like this: compile the source text of the function First create supported functions table (id,num of … Read more
@Dave was the first to post an answer to this (with working code), and his answer has been an invaluable source of shameless copy and pasting inspiration to me. This post began as an attempt to explain and refine @Dave’s answer, but it has since evolved into an answer of its own. My method is … Read more