size(400, 400);
float a = 80;
float b = 320;
float c = lerp(a, b, .8);
float d = lerp(a, b, .20);
float e = lerp(a, b, .32);
beginShape(POINTS);
vertex(a, 200);
vertex(b, 200);
vertex(c, 200);
vertex(d, 200);
vertex(e, 200);
endShape();

size(400, 400);
int x1 = 60;
int y1 = 40;
int x2 = 320;
int y2 = 360;
line(x1, y1, x2, y2);
for (int i = 0; i <= 40; i++) {
  float x = lerp(x1, x2, i/40.0) + 40;
  float y = lerp(y1, y2, i/40.0);
  point(x, y);
}