Processing 1.0 - Processing Discourse - Camera moving with a trajectory

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Index › Programming Questions & Help › OpenGL and 3D Libraries › Camera moving with a trajectory

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Camera moving with a trajectory (Read 988 times)

Mou7

Camera moving with a trajectory
Nov 2^nd, 2009, 2:16am

Hi,

I am new to processing and I find it great.

I am trying to write a program that plots a given 2d trajectory (x,y) and I want the camera to move with the curve (I want the camera to focus on the point being actually plotted while still displaying some of the preceding points).

I am trying to do it with the ocd package but I am stuck.

With the code below, I have only one point which is displayed

Thanks,

Mohamed
--------------------------------------------------
This is a simplified version of "draw" code

void draw(){
Trajectory trajectory = new Trajectory("positions.txt",this);
camera1.feed();
stroke(255);
point((trajectory.x)[index-1],(trajectory.y)[index-1]);
camera1.aim((trajectory.x)[index],(trajectory_smoothed.y[index],100);

}

ben_hem Senior Member Offline Posts: 399 CA, US	Re: Camera moving with a trajectory Reply #1 - Nov 2^nd, 2009, 7:49pm does your trajectory class include an array/Vector/etc. of each point? It sounds like you need to make sure you're reading the entire file of points into your trajectory object, then looping through each point...

Mou7

Re: Camera moving with a trajectory
Reply #2 - Nov 3^rd, 2009, 5:51am

Thank you for answering

Ma trajectory object has two attributes :

Trajectory(float[] x, float[] y)
{
this.x = x;
this.y = y;
}

I am incrementing the index variable so I loop through the arrays (I did not put all the code in the example to make it simple).
I really think that the problem comes from the camera management.

Mou7

Re: Camera moving with a trajectory
Reply #3 - Nov 3^rd, 2009, 5:57am

Here is the code

import damkjer.ocd.*;

int index = 1;
Camera camera1;

void setup() {
size(800,800, P3D);
background(0, 0, 0);
stroke(255);
frameRate(30);
camera1 = new Camera(this, 0, 0, 500);

}

void draw(){
Trajectory trajectory = new Trajectory("positions.txt",this);

float xMin = min(trajectory.x);
float yMin = min(trajectory.y);
float xMax = max(trajectory.x);
float yMax = max(trajectory.y);

index = index + 1 ;
index = index%((trajectory.x).length);
trajectory = rescale(trajectory, xMin, xMax, yMin, yMax);

camera1.feed();

stroke(255);
point((trajectory.x)[index-1],(trajectory.y)[index-1]);

camera1.aim((trajectory.x)[index],(trajectory.y)[index],600);

}

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