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Array[][] causes NullPointerException，help！

[1 Reply]
- 09-Jul-2013 05:50 AM
- Forum: Programming Questions
there is three tabs Toximesh ，Grid， Pt

Toximesh

import toxi.math.conversion.*;

import toxi.geom.*;

import toxi.math.*;

import toxi.geom.mesh2d.*;

import toxi.util.datatypes.*;

import toxi.util.events.*;

import toxi.geom.mesh.subdiv.*;

import toxi.geom.mesh.*;

import toxi.math.waves.*;

import toxi.util.*;

import toxi.math.noise.*;

import controlP5.*;

import peasy.test.*;

import peasy.org.apache.commons.math.*;

import peasy.*;

import peasy.org.apache.commons.math.geometry.*;

PeasyCam cam;

Grid mygrid;

void setup() {

size(600, 600, P3D);

cam = new PeasyCam(this, 1000);

mygrid = new Grid(this, 201, 61,5, 5);

}

void draw() {

background(255,0,0);

stroke(255);

strokeWeight(1);

smooth();

noFill();

rect(0, 0, 1000, 300);

mygrid.run();

}

Grid

class Grid {

Toximesh p5;

int cols;

int rows;

Pt[][] allPts;

float scaleX;

float scaleY;

Grid(Toximesh _p5, int cols, int rows, float scaleX, float scaleY) {

this.p5=p5;

this.cols=cols;

this.rows =rows;

this.scaleX =scaleX;

this.scaleY = scaleY;

for (int i =0;i<cols;i++) {

for (int j=0;j<rows;j++) {

Vec3D v = new Vec3D(i*scaleX, j*scaleY, 0);

allPts[i][j] = new Pt(p5, v); //this is the highlight

}

}

}

void run() {

runPoints();

}

void runPoints() {

for (int i =0;i<cols;i++) {

for (int j=0;j<rows;j++) {

allPts[i][j].run();

}

}

}

}

Pt

class Pt {

Toximesh p5;

Vec3D loc;

Pt(Toximesh p5, Vec3D loc) {

this.loc = loc;

this.p5=p5;

}

void run() {

display();

}

void display() {

p5.stroke(0, 255, 0);

p5.strokeWeight(2);

p5.point(loc.x, loc.y, loc.z);

}

}

error logs

PeasyCam v200

Exception in thread "Animation Thread" java.lang.NullPointerException

at Toximesh$Grid.<init>(Toximesh.java:95)

at Toximesh.setup(Toximesh.java:60)

at processing.core.PApplet.handleDraw(PApplet.java:2117)

at processing.opengl.PGL$PGLListener.display(PGL.java:2472)

at jogamp.opengl.GLDrawableHelper.displayImpl(GLDrawableHelper.java:548)

at jogamp.opengl.GLDrawableHelper.display(GLDrawableHelper.java:533)

at jogamp.opengl.GLAutoDrawableBase$2.run(GLAutoDrawableBase.java:280)

at jogamp.opengl.GLDrawableHelper.invokeGLImpl(GLDrawableHelper.java:904)

at jogamp.opengl.GLDrawableHelper.invokeGL(GLDrawableHelper.java:822)

at com.jogamp.newt.opengl.GLWindow.display(GLWindow.java:543)

at processing.opengl.PGL.requestDraw(PGL.java:814)

at processing.opengl.PGraphicsOpenGL.requestDraw(PGraphicsOpenGL.java:1566)

at processing.core.PApplet.run(PApplet.java:2020)

at java.lang.Thread.run(Thread.java:662)

Already called beginDraw()

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