所以基本上我试图创建一些复杂的（对于我的编程水平）并尝试使用kinect来触发不同的绘制。 我很抱歉这么多代码，但错误正在慢慢让我疯狂
Car worldmap;
Hotpoint ColorTrigger;
import processing.opengl.*;
import SimpleOpenNI.*;
SimpleOpenNI kinect;
float rotation = 0;
int boxSize = 150;
PVector blueboxCenter = new PVector(200, 800, 600);
PVector boxCenter = new PVector(0, 0, 600);
float s = 1;
void setup() {
size(displayWidth, displayHeight, OPENGL);
SimpleOpenNI kinect = new SimpleOpenNI(this);
kinect.enableDepth();
ColorTrigger = new Hotpoint(200, 0, 600, 150);
}
void draw() {
if (keyPressed == true) {
background(0);
kinect.update();
translate(width/2, height/2, -1000);
rotateX(radians(180));
translate(0, 0, 1400);
rotateY(radians(map(mouseX, 0, width, -180, 180)));
translate(0, 0, s*-1000);
scale(s);
stroke(255);
PVector[] depthPoints = kinect.depthMapRealWorld();
int depthPointsInBox = 0;
for (int i = 0; i < depthPoints.length; i+=10) {
PVector currentPoint = depthPoints[i];
point(currentPoint.x, currentPoint.y, currentPoint.z);
ColorTrigger.check(currentPoint);
}
ColorTrigger.display();
ColorTrigger.clear() ;
ColorTrigger.wasJustHit = ColorTrigger.currentlyHit();
ColorTrigger.pointsIncluded = 0;
} else {
worldmap.display();
}
}
class Hotpoint {
PVector center;
color fillColor;
color strokeColor;
int size;
int pointsIncluded;
int maxPoints;
boolean wasJustHit;
int threshold;
float Gotme;
Hotpoint(float centerX, float centerY, float centerZ, int boxSize)
{
center = new PVector(centerX, centerY, centerZ);
size = boxSize;
pointsIncluded = 0;
maxPoints = 1000;
threshold = 0;
fillColor = strokeColor = color(random(255), random(255), random(255));
}
void setThreshold( int newThreshold ) {
threshold = newThreshold;
}
void setMaxPoints(int newMaxPoints) {
maxPoints = newMaxPoints;
}
void setColor(float red, float blue, float green) {
fillColor = strokeColor = color(red, blue, green);
}
boolean check(PVector point) {
boolean result = false;
if (point.x > center.x - size/2 && point.x < center.x + size/2) {
if (point.y > center.y - size/2 && point.y < center.y + size/2) {
if (point.z > center.z - size/2 && point.z < center.z + size/2) {
result = true;
pointsIncluded++;
}
}
}
return result;
}
void display() {
float Gotme = map(pointsIncluded, 0, 1000, 0, 255);
translate(center.x, center.y, center.z);
rotateY(-PI/6);
rotateY(radians(frameCount));
println(Gotme);
fill(255, 0, 0, Gotme);
stroke(255, 0, 0);
box(boxSize);
}
boolean currentlyHit() {
return (pointsIncluded > threshold);
}
boolean isHit() {
return currentlyHit() && !wasJustHit;
}
void clear() {
wasJustHit = currentlyHit();
pointsIncluded = 0;
}
}
class Car {
color c;
float xpos;
float ypos;
float xspeed;
// The Constructor is defined with arguments.
Car(color tempC, float tempXpos, float tempYpos, float tempXspeed) {
c = tempC;
xpos = tempXpos;
ypos = tempYpos;
xspeed = tempXspeed;
}
void display() {
stroke(0);
fill(c);
rectMode(CENTER);
rect(xpos, ypos, 20, 10);
}
void drive() {
xpos = xpos + xspeed;
if (xpos > width) {
xpos = 0;
}
}
}
这是我得到的错误
java.lang.RuntimeException: java.lang.NullPointerException
at com.jogamp.common.util.awt.AWTEDTExecutor.invoke(AWTEDTExecutor.java:58)
at jogamp.opengl.awt.AWTThreadingPlugin.invokeOnOpenGLThread(AWTThreadingPlugin.java:103)
at jogamp.opengl.ThreadingImpl.invokeOnOpenGLThread(ThreadingImpl.java:206)
at javax.media.opengl.Threading.invokeOnOpenGLThread(Threading.java:172)
at javax.media.opengl.Threading.invoke(Threading.java:191)
at javax.media.opengl.awt.GLCanvas.display(GLCanvas.java:541)
at processing.opengl.PJOGL.requestDraw(PJOGL.java:688)
at processing.opengl.PGraphicsOpenGL.requestDraw(PGraphicsOpenGL.java:1651)
at processing.core.PApplet.run(PApplet.java:2256)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException
at hotbox7.draw(hotbox7.java:73)
at processing.core.PApplet.handleDraw(PApplet.java:2386)
at processing.opengl.PJOGL$PGLListener.display(PJOGL.java:862)
at jogamp.opengl.GLDrawableHelper.displayImpl(GLDrawableHelper.java:665)
at jogamp.opengl.GLDrawableHelper.display(GLDrawableHelper.java:649)
at javax.media.opengl.awt.GLCanvas$10.run(GLCanvas.java:1289)
at jogamp.opengl.GLDrawableHelper.invokeGLImpl(GLDrawableHelper.java:1119)
at jogamp.opengl.GLDrawableHelper.invokeGL(GLDrawableHelper.java:994)
at javax.media.opengl.awt.GLCanvas$11.run(GLCanvas.java:1300)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:302)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:733)
at java.awt.EventQueue.access$200(EventQueue.java:103)
at java.awt.EventQueue$3.run(EventQueue.java:694)
at java.awt.EventQueue$3.run(EventQueue.java:692)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:703)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)
答案 0 :(得分：0)
我想，我发现了错误：
首先，您将kinect声明为类属性，然后在kinect - 方法中声明一个新对象setup()。局部变量隐藏了class属性，因此kinect.enableDepth();引用局部变量，而不是class属性。
因此，类属性永远不会被分配（据我所见），所以它仍然是null。调用draw() - 方法时，它会在kinect.update();上失败，因为它引用了class属性null。因为您尝试将方法称为null - 对象，所以Java会抛出NullPointerException。
答案 1 :(得分：0)
您已经声明了SimpleOpenNI kinect变量（只是没有初始化为任何内容），所以不要重新在setup（）中定义它，只需将其分配给一个值：
void setup() {
...
kinect = new SimpleOpenNI(this);
...
}
通过使用SimpleOpenNI kinect = new SimpleOpenNI(this);，您声明了一个 new 变量，范围为＆＃34;仅在setup（）函数内生存＃34;所以当我们退出setup（）时，该变量被丢弃，全局kinect仍然是空指针。