euglena/src/Line.java

import processing.core.*;
import static processing.core.PApplet.*;


class Line {
  float x1, y1, x2, y2;
  int color, brushSize;
  boolean visible;

  private boolean point1complete;

  Line(int color, int penWidth) {
    this.color = color;
    this.brushSize = penWidth;
    this.visible = true;

    this.point1complete = false;
  }

  Line(float x1, float y1, float x2, float y2, int color, int penWidth) {
    this.x1 = x1;
    this.y1 = y1;
    this.x2 = x2;
    this.y2 = y2;
    this.color = color;
    this.brushSize = penWidth;
    this.visible = true;

    this.point1complete = true;
  }


  ProjectorCommand makeProjectorCommand() {
    return (ProjectorApplet p) -> {
      if (!visible) {
        //done drawing already
        return true;
      }

      float old_strokeWeight = p.g.strokeWeight;
      int old_strokeColor = p.g.strokeColor;

      p.strokeWeight(brushSize);
      p.stroke(color);
      p.noFill();

      p.line(p.convertXCoord(x1), p.convertYCoord(y1),
              p.convertXCoord(x2), p.convertYCoord(y2));

      p.strokeWeight(old_strokeWeight);
      p.stroke(old_strokeColor);
      return true;
    };
  }

  ClickGetter makeClickGetter(ProjectorApplet p) {
    return (int x, int y) -> {
      if (!point1complete){
        x1 = x;
        y1 = y;
        point1complete = true;
        return false;

      } else {
        x2 = x;
        y2 = y;
        visible = true;

        p.commandQueue.add(makeProjectorCommand());
        return true;
      }
    };
  }
}