Errata

Here is the code snippet from section 6.2 I'm working on:


void readData( ) {
String[] lines = loadStrings("zips.tsv");
parseInfo(lines[0]); // read the header line

places = new Place[totalCount];
for (int i = 1; i < lines.length; i++) {
places[placeCount] = parsePlace(lines[i]);
placeCount++;
}
}


I keep getting an array out of bounds error for this line:

places[placeCount] = parsePlace(lines[i]);


Here is the error information I get:
ArrayIndexOutOfBoundsException: 5712

and the stacktrace:

Exception in thread "Animation Thread" java.lang.ArrayIndexOutOfBoundsException: 5712
at ch06_scatterplot.readData(ch06_scatterplot.java:45)
at ch06_scatterplot.setup(ch06_scatterplot.java:34)
at processing.core.PApplet.handleDraw(PApplet.java:1372)
at processing.core.PApplet.run(PApplet.java:1300)
at java.lang.Thread.run(Unknown Source)



Thanks,
Marlena Compton

in the for loop of parseWinLoss:

lines.length() is generating a null pointer error. I downloaded the example project from Ben Fry's web-site, step_08b_web and got the same null pointer exception in the setupStandings method. The second line of this method also accesses lines.length.

Zooming isn't working as advertised.

After typing in the code from the book and debugging for syntax errors, the only functionality I get is opposite from zooming. I start typing in numbers and all of the data points shrink to the bottom left corner of the screen.

Since the code from your web-site zooms correctly, I started reading through your code and can see that it is substantially different from code that is in the book.

Would you mind providing some comments about the changes? Since I want to finish this chapter, I'm going to keep going with just changing my code from the books not-working code to your is-working code, but I'd like to see some comments on what's changed and why.

Zooming is the reason why I've stuck with this chapter, as long as it's taken me, and I'd really like to know.

Cheers,
Marlena

Hi Ben:

I had to add code from the example I downloaded on your web-site to get the zip code I was typing to show up. The draw method listed in the printed text and in the on-line safari text left out the lines that draw the zip code being typed on the screen. So I kept typing digits but couldn't see my zip code anywhere.

I looked but couldn't find this info listed in the errata.

In addition, the code from your web-site had these messages "zipdecode by Ben Fry" and "type the digits of a zip code." When I ran it the way it was typed in the example, the label was positioned over the area where the numbers where added so I made a separate text label with a Y coordinate higher than the Y of the zip code text.

Here's what I ended up with:


void setup(){

message = "";
zipCodeLabel = "Type the digits of a zip code";


size(720, 453, P3D);

mapX1 = 30;
mapX2 = width - mapX1;
mapY1 = 20;
mapY2 = height - mapY1;


font = loadFont("Arial-BoldMT-15.vlw");
textFont(font);
textMode(SCREEN);


messageX = 40;
messageY = height - 30;
message2Y = height - 45;


text(message,messageX, messageY);


readData();
}//end setup

void draw(){

background(backgroundcolor);

text(zipCodeLabel, messageX, message2Y);
text(message, messageX, messageY);
for (int i = 0; i < placeCount; i++){
places[i].draw( );
}

if (typedCount == 0){
fill(waitingcolor);
textAlign(LEFT);

//if all places are loaded
if (placeCount == totalCount){

}//end if placecount

text(message, messageX, messageY);
} else {
if (foundCount > 0){
if (typedCount == 4){
//will have zoom later so that points can be de-clustered
for (int i=0; i < placeCount; i++){
if (places[i].matchDepth == typedCount){
places[i].draw();
}
}
}



fill(highlightcolor);
textAlign(LEFT);
text(typedString, messageX, messageY);
} else {
fill(badcolor);
text(typedString, messageX, messageY);
}
}



}//end draw