Moving line

Vasco

The img is only to help me explain a bit better what i'm trying to do. So, the img on the background as the points (A and B) are static images, but i want to make the line to move from point A to B, as in GPS.

Chrisir

Yes.

look at lerp() to make this

draw a line from A to the lerp() point and increase amt in draw()

No for-loop

It's a direct line without the Z

Vasco

I'm going to try it then. Thank you

Vasco

PImage map, startLocation, endLocation; 
float x, target;

void setup() {
  size(320, 320);

  // IMAGENS
  map = loadImage ("img/map.png");
  startLocation = loadImage ("img/startLocation.png");
  endLocation = loadImage ("img/endLocation.png");

  // IMAGEM DE FUNDO
  background (0);

  x = width/12;
  target = 210;
}

void draw() {

  // MAPA
  background (map);

  x = lerp(x, target, 0.020);

  // LOCALIZAÇÃO DO CARRO
  image (startLocation, width/11, height/1.6);
  startLocation.resize (0, 20);

  // LOCALIZAÇÃO DO USER
  image (endLocation, width/1.6, height/2.5 );
  endLocation.resize (0, 20);

  // CAMINHO DO USER
  stroke ( 255, 100, 100);
  line ( x, 160, 38, 222);
}

this is what i got. i wonder if, instead of doing with a line i could put the "endLocation " img moving. is that possible?

Chrisir

Yes

Vasco

I'm trying to make the "endLocation " img moving, but i can´t, and at this point i dont know what i'm doing xD, ahaha. Can you please show me how? I already try PVectors but still failed. I want to believe it is because i never used lerp() or PVectors, but at this point i have no idea

Chrisir

First, you lerp x

but you forgot to lerp y as well

Then just say

image(endLocation, x, y );

also you need to increase the amt value :

amt += .05;

and use it in both lerp()-lines

Remark:

to do this properly I suggest better names

That lets you have control and a good over view over your own code.

e.g. you use numbers in line or lerp - very confusing

Better use variables throughout

Like startX, startY

endX, endY (all four are fixed)

then currentX , currentY = they come from the lerp()-lines