plotting gps please help

Programming Questions

kenb93

in Programming Questions • 1 year ago

hi all

im trying to plot latitude ,longitude and display the the completed track but can only display the current position as the file is read . I believe i need to create an array list to store the positions before they can be permanently displayed

can somone offer some help with this.

many thanks

this is the code im running with a sample of the gps code at the bottom.

BufferedReader reader;

String line;

//-----------------------

float latitude =0.0;

String northSouth;

float longitude = 0.0;

String eastWest;

float heading = 0.0;

float speed =0.0;

int hrs,mins,secs;

int thisDay, thisMonth,thisYear;

//-----------------------------------

float x;

float y;

PImage raster;

void setup() {

size(1700, 700);

//-----------------

PFont myFont =createFont(PFont.list()[2],24);

textFont(myFont);

//-------------

ellipseMode(CENTER);

smooth();

frameRate(10);

// Open the file from the createWriter() example

reader = createReader("gprmc.txt");

}

void draw() {

background (0);

fill (255);

text(thisMonth+"/"+thisDay+"/"+thisYear,50,30);

text(hrs+":"+mins+":"+secs +" ",50,50);

text("Lng" +" " +eastWest, 50,70);

text("Lat " +" "+northSouth , 50,90);

text("heading "+ heading + "degrees",50,110);

// text(hrs+":"+mins+":"+secs +"GMT ",50,130);

//text("Lat " +" "+northSouth , 50,130);

// text("heading "+ heading + "degrees",50,150);

text("Speed M/Sec "+ speed ,50,170);

// drawArrow(heading);

try {

line = reader.readLine();

} catch (IOException e) {

e.printStackTrace();

line = null;

}

if (line == null) {

println();

// Stop reading because of an error or file is empty

//noLoop();

} else {

String[] pieces = split(line, ",");

println();

//-----------------------------------

//if (pieces[0].equals("$GPRMC")){

//----------------------------

int time = int(pieces[1]);

//first two digits of time are the hours

//if (pieces[0].equals("$GPRMC")){

// getRMC (pieces);

if (pieces[0].equals("$GPRMC")){

float latitude = float(pieces[3])/100.0;

float longitude= float(pieces[5])/100.0;

heading = float (pieces[7]);

northSouth = (pieces[5]);

eastWest = (pieces [3]);

speed = float(pieces [7]);

int date = int (pieces[9]);

thisYear =date0+2000;

//second two digits are month

thisMonth =(date000)/100;

//first two digits of date are day

thisDay = date/10000 ;

if (pieces.length == 13) {float mapX = float(pieces[3]);

float mapY = float(pieces[5]);

println(mapX + " " + mapY);

//println();

float w_start = 00048.0990; // Longtitude start (largest longitude value)

float w_end = 00048.06929; // Longtitude end (smallest longitude value)

float h_start = 5120.1023; // Latitude start (largest latitude value)

float h_end = 5120.060012; // Latitude end (smallest latitude value)

int mapX1 = 0;

int mapX2 = width;

int mapY1 = 0;

int mapY2 = height;

x = int(((180+mapY)/360)*width);

y = int(height - ((90+mapX)/180)*height);

x = map(mapY, w_start, w_end, mapX1, mapX2);

y = map(mapX, h_end, h_start, mapY1, mapY2);

ellipse(x, y, 10, 10);

hrs= time/1000;

//second two digits=minutes

mins = (time000)/100;

//last two digits =seconds

secs = (time0);

}}

drawArrow(heading);

}

//--------------

void drawArrow (float angle){

translate(width/2,height/2);

fill(80,200,230);

ellipse(0,0,50,50);

fill (0);

rotate(radians(angle));

//draw the arrow .centre of arrow is at 0.0

triangle (-10,0,0,-20,10,0);

rect(-2,0,4,20);

//}

//background (0);

}

sample gps - gprmc.text

$GPRMC,125924.00,A,5120.07122,N,00048.08916,E,0.081,,221211,,,A*79

$GPRMC,125925.00,A,5120.07131,N,00048.08929,E,0.096,,221211,,,A*70

$GPRMC,125926.00,A,5120.07125,N,00048.08864,E,0.117,,221211,,,A*76

$GPRMC,125927.00,A,5120.07127,N,00048.08883,E,0.279,,221211,,,A*77

$GPRMC,125928.00,A,5120.07137,N,00048.08842,E,0.490,,221211,,,A*75

$GPRMC,125930.00,A,5120.07136,N,00048.08822,E,0.782,,221211,,,A*7B

$GPRMC,125932.00,A,5120.07125,N,00048.08877,E,0.803,,221211,,,A*7D

$GPRMC,125934.00,A,5120.07026,N,00048.08660,E,0.408,,221211,,,A*76

$GPRMC,125936.00,A,5120.06974,N,00048.08493,E,0.024,,221211,,,A*7F

$GPRMC,125937.00,A,5120.06959,N,00048.08464,E,0.072,,221211,,,A*7A

$GPRMC,125938.00,A,5120.06950,N,00048.08428,E,0.067,,221211,,,A*70

$GPRMC,125941.00,A,5120.06957,N,00048.08386,E,0.135,,221211,,,A*7C

$GPRMC,125942.00,A,5120.06952,N,00048.08369,E,0.123,,221211,,,A*7C

$GPRMC,125943.00,A,5120.06950,N,00048.08361,E,0.116,,221211,,,A*71

$GPRMC,125944.00,A,5120.06951,N,00048.08362,E,0.088,,221211,,,A*72

$GPRMC,125945.00,A,5120.06955,N,00048.08363,E,0.107,,221211,,,A*70

$GPRMC,125947.00,A,5120.06966,N,00048.08353,E,0.112,,221211,,,A*75

$GPRMC,125948.00,A,5120.06975,N,00048.08346,E,0.088,,221211,,,A*7E

$GPRMC,125950.00,A,5120.06983,N,00048.08331,E,0.085,,221211,,,A*73

$GPRMC,125952.00,A,5120.06994,N,00048.08326,E,0.271,,221211,,,A*78

$GPRMC,125953.00,A,5120.06998,N,00048.08328,E,0.121,,221211,,,A*7D

$GPRMC,125954.00,A,5120.06999,N,00048.08326,E,0.107,,221211,,,A*71

$GPRMC,125955.00,A,5120.07000,N,00048.08326,E,0.079,,221211,,,A*70

$GPRMC,125958.00,A,5120.07002,N,00048.08327,E,0.083,,221211,,,A*7B

$GPRMC,130002.00,A,5120.07017,N,00048.08332,E,0.086,,221211,,,A*7C

$GPRMC,130003.00,A,5120.07023,N,00048.08332,E,0.097,,221211,,,A*7A

$GPRMC,130005.00,A,5120.07020,N,00048.08333,E,0.086,,221211,,,A*7E

$GPRMC,130008.00,A,5120.07028,N,00048.08343,E,0.102,,221211,,,A*71

$GPRMC,130010.00,A,5120.07033,N,00048.08345,E,0.118,,221211,,,A*7F

$GPRMC,130012.00,A,5120.07039,N,00048.08338,E,0.082,,221211,,,A*7F

$GPRMC,130014.00,A,5120.07039,N,00048.08333,E,0.076,,221211,,,A*79

$GPRMC,130015.00,A,5120.07042,N,00048.08333,E,0.108,,221211,,,A*7C

$GPRMC,130016.00,A,5120.07043,N,00048.08333,E,0.100,,221211,,,A*76

$GPRMC,130018.00,A,5120.07049,N,00048.08336,E,0.088,,221211,,,A*76

$GPRMC,130019.00,A,5120.07051,N,00048.08340,E,0.129,,221211,,,A*75

$GPRMC,130021.00,A,5120.07054,N,00048.08349,E,0.060,,221211,,,A*7E

$GPRMC,130024.00,A,5120.07050,N,00048.08357,E,0.125,,221211,,,A*70

$GPRMC,130025.00,A,5120.07046,N,00048.08355,E,0.074,,221211,,,A*71

$GPRMC,130028.00,A,5120.07046,N,00048.08350,E,0.177,,221211,,,A*7B

$GPRMC,130029.00,A,5120.07049,N,00048.08350,E,0.133,,221211,,,A*75

$GPRMC,130031.00,A,5120.07048,N,00048.08351,E,0.123,,221211,,,A*7D

$GPRMC,130033.00,A,5120.07050,N,00048.08356,E,0.162,,221211,,,A*74

$GPRMC,130034.00,A,5120.07051,N,00048.08357,E,0.108,,221211,,,A*7F

$GPRMC,130035.00,A,5120.07050,N,00048.08359,E,0.124,,221211,,,A*7F

$GPRMC,130038.00,A,5120.07042,N,00048.08358,E,0.115,,221211,,,A*72

$GPRMC,130040.00,A,5120.07040,N,00048.08358,E,0.177,,221211,,,A*7B

$GPRMC,130043.00,A,5120.07032,N,00048.08355,E,0.117,,221211,,,A*76

$GPRMC,130044.00,A,5120.07027,N,00048.08355,E,0.155,,221211,,,A*73

$GPRMC,130047.00,A,5120.07021,N,00048.08354,E,0.145,,221211,,,A*76

$GPRMC,130049.00,A,5120.07013,N,00048.08355,E,0.276,,221211,,,A*7B

Replies(10)

PhiLho

Re: plotting gps please help

1 year ago

If the file isn't too big, load it with loadStrings() and you get an array of lines you can parse in draw().

kenb93

Re: plotting gps please help

1 year ago

Hi phi.lho

many thanks for your reply

Ive now used load strings as suggested and it plots all the coordinates to screen what i now need to do is overlay

the the code above to sequentially plot the current position over the complete track

Im thinking of duplicating the gps file -save as gprmc2.text and use bufferdReader for that file and loadStrings[] with

gprmc.text

but i have no idea if this could work

I guess this is a very rough approach .can you advise many thanks

ken

I guess you guys who know what your doing are probably falling off your chairs by now

i advise some padding cos theres sure to be more of the same ,for the project im working on

PhiLho

Re: plotting gps please help

1 year ago

I don't see the point of reading twice the file, even less duplicating it!
Actually, I am not sure to understand what you need to do. But you have the whole data in memory, you can use it whatever way you want.

kenb93

Re: plotting gps please help

1 year ago

sorry for the delay in responding .

I have found an example that better demonstrates what i want to achieve .

however i don't know if i can use this example or how to write code to work with loadstrings & map if it is possible

for this to work can you offer some pointers as to how.

Ive commented where i think changes need to be made or can be made

/**

Title: 2D Path

Author: Ekene Ijeoma

Date: Febuary 2010

Description: Creates a random 2D path

Controls:

SPACE: create random path //CHANGE FROM A RANDOM PATH TO COORDS READ IN //FROM FILE

1: linear mode

2: cosine mode //NOT REQUIRED

3: cubic mode //NOT REQUIRED

4: hermite mode //NOT REQUIRED

import ijeoma.geom.path.Path2D;

int vertexCount = 5; //EDIT THIS TO REFLECT NUMBER OF //COORDS IN FILE

float pathBegin, pathEnd, pathLength, pathSegmentLength;

PVector[] vertices = new PVector[vertexCount];

Path2D path;

public void setup() {

size(300, 300, P3D);

pathBegin = 0;

pathEnd = width;

pathLength = pathEnd - pathBegin;

pathSegmentLength = pathLength / (vertexCount - 1);

setupPath();

}

public void setupPath() {

for (int i = 0; i < vertexCount - 1; i++) {

float x = pathBegin + pathSegmentLength * i;

float y = random(100, 200);

vertices[i] = new PVector(x, y, 0);

}

vertices[vertexCount - 1] = new PVector(pathEnd, random(100, 200), 0);

path = new Path2D(this, vertices);

}

public void draw() {

background(255);

path.draw();

PVector pathVertex = path.getVertex((float) mouseX / width); //EDIT TO String [ ] = loadstrings

// ("gprmc.text");

ellipse(pathVertex.x, pathVertex.y, 10, 10);

}

public void keyPressed() { //key press for mode selection not required can run in linear mode

if (key == ' ')

setupPath();

else if (key == '1')

path.setMode(Path2D.LINEAR);

else if (key == '2')

path.setMode(Path2D.COSINE);

else if (key == '3')

path.setMode(Path2D.CUBIC);

else if (key == '4')

path.setMode(Path2D.HERMITE);

}

however I would like to be able to add a timeline to scroll forwards and backwards with a scroll bar .

but at the moment getting it to just run would be a break through for me.

many thanks in advanced if you can offer any help

cheers ken

PhiLho

Re: plotting gps please help

1 year ago

I am not sure of what to do with the code snippet you show.
Where are you stuck? Can you show your code with loadStrings?

kenb93

Re: plotting gps please help

1 year ago

heres the loadStrings to get it to run ive had to comment out much of the draw but it does plot lat &long

thanks ken

float latitude =0.0;

String northSouth;

float longitude = 0.0;

String eastWest;

float heading = 0.0;

float speed =0.0;

int hrs,mins,secs;

int thisDay, thisMonth,thisYear;

//-----------------------------------

float x_a;

float y_a;

PImage raster;

void setup() {

size(1700, 700);

//-----------------

PFont myFont =createFont(PFont.list()[2],24);

textFont(myFont);

//-------------

ellipseMode(CENTER);

smooth();

frameRate(10);

String [] geoCoords = loadStrings("gprmc.txt");

println("there are " + geoCoords.length + " geoCoords");

for (int i=0; i < geoCoords.length; i++) {

println(geoCoords[i]);

}

//}

//void draw() {

background (0);

fill (255);

text(thisMonth+"/"+thisDay+"/"+thisYear,50,30);

text(hrs+":"+mins+":"+secs +" ",50,50);

text("Lng" +" " +eastWest, 50,70);

text("Lat " +" "+northSouth , 50,90);

text("heading "+ heading + "degrees",50,110);

text(hrs+":"+mins+":"+secs +"GMT ",50,130);

text("Lat " +" "+northSouth , 50,130);

text("heading "+ heading + "degrees",50,150);

text("Speed M/Sec "+ speed ,50,170);

//{

// drawArrow(heading);

//}

// void drawArrow (float angle){

// translate(width/2,height/2);

//fill(80,200,230);

//ellipse(0,0,50,50);

// fill (0);

// rotate(radians(angle));

//draw the arrow .centre of arrow is at 0.0

// triangle (-10,0,0,-20,10,0);

// rect(-2,0,4,20);

for (int i = 0; i < geoCoords.length; i++) {

String[] piece = split(geoCoords[i], ",");

if (piece.length == 13)

{float a_mapX = float(piece[3]);

float a_mapY = float(piece[5]);

println(a_mapX + " " + a_mapY);

//println();

float a_w_start = 00048.0990; // Longtitude start (largest longitude value)

float a_w_end = 00048.06929; // Longtitude end (smallest longitude value)

float a_h_start = 5120.1023; // Latitude start (largest latitude value)

float a_h_end = 5120.060012; // Latitude end (smallest latitude value)

int a_mapX1 = 0;

int a_mapX2 = width;

int a_mapY1 = 0;

int a_mapY2 = height;

x_a = int(((180+a_mapY)/360)*width);

y_a = int(height - ((90+a_mapX)/180)*height);

x_a = map(a_mapY, a_w_start, a_w_end, a_mapX1, a_mapX2);

y_a = map(a_mapX, a_h_end, a_h_start, a_mapY1, a_mapY2);

ellipse (x_a,y_a,10,10);

//}

}

kenb93

Re: plotting gps please help

1 year ago

hi all

I think i might be making some progress

Ive looked at some other examples

and am working on the following code which i think is getting closer

however its still not correct so could anyone have a look and advise

Im trying to use a time slider to run through a file containing a simple plot of screen coordinates

Im pretty sure that the file loads as i can step through the coordinates if I edit line 42 - int index =0

however Im going wrong somewhere ref index or it might be void draw, void readData

because the coords do not print to screen only the ellipse moves from top left to bottom right

hope you guys understand my problem

any help appreciated

cheers kenb

/**

* LoadFile 1

* Loads a text file that contains two numbers separated by a tab ('\t').

* A new pair of numbers is loaded each frame and used to draw a point on the screen.

import controlP5.*;

ControlP5 controlP5;

int time;

boolean playPause = true; // true = play, false = pause

void play() { playPause = !playPause; } // toggle

String[] lines;

int index = 0;

void setup()

{

size(500, 500);

background(0);

stroke(255);

frameRate(12);

smooth();

controlP5 = new ControlP5(this);

controlP5.addSlider("time",0,width,10,height-30,width-75,20);

controlP5.addButton("play",0,width-40,height-30,30,20);

readData();

lines = loadStrings("mytestlines2.txt");

}

void draw() {

if (index < lines.length) {

String[] pieces = split(lines[index], '\t');

if (pieces.length == 2) {

int x = int(pieces[0]) * 2;

int y = int(pieces[1]) * 2;

point(x, y);

}

// Go to the next line for the next run through draw()

index = index + 1;

}

readData();

}

//{

void readData()

{

if (playPause) { time++; controlP5.controller("play").setLabel("Pause"); }

else { controlP5.controller("play").setLabel("Play"); }

if (time >= width) { time = 0; } // reset when right side is reached (only useful for this particular sketch)

controlP5.controller("time").setValue(time); // set the slider to time value

// randomSeed(1); // controls the randomness, to get the same output every time

for (int i=index; i<time; i++) { // the time variable controls the output

float c = map(i,0,time,0,255);

fill(c,c);

ellipse(i,i,7,7);

}

//}

here the text file of screen coordinates

7 164

7 168

11 170

16 173

22 173

25 174

29 175

32 177

35 180

38 181

41 187

43 187

55 192

64 194

72 193

77 190

84 187

89 185

92 184

92 183

100 188

113 194

122 196

133 197

141 197

149 192

155 186

160 182

163 180

164 179

169 179

177 175

183 168

185 162

188 155

189 148

190 147

190 143

189 137

184 133

178 129

168 125

156 123

149 122

148 122

143 120

133 119

123 119

113 123

102 126

93 126

84 125

71 119

66 117

63 117

58 117

51 117

44 113

38 106

33 98

31 92

30 90

30 88

33 85

40 84

47 83

55 80

64 79

72 78

75 78

75 80

84 82

91 84

98 85

105 85

110 85

117 85

124 86

130 86

131 86

135 87

142 88

150 87

157 79

162 73

167 68

169 58

164 42

158 39

148 37

140 37

135 37

133 37

125 37

115 37

105 35

98 31

89 28

83 26

75 23

70 22

63 21

59 21

56 21

55 21

PhiLho

Re: plotting gps please help

1 year ago

Your code works for me, once I removed the controlP5 code (it is better to get to the point without adding complexity to the mix) and once I converted the spaces in the text file by tabs (problem with the forum, I suppose).
I see a trail of small white points.

kenb93

Re: plotting gps please help

1 year ago

hi there phi.iho

getting to display the points is not the problem I need to display them with the time slider so i can scan back and forward

and pause at any one particular point in the trail .

this is a test program to get playback functionality to the gps track

once i get this slider part of the code to work I then want to use it in the gps sketch to allow me to see the changes in other data like speed and heading at any given point

Ihope you understand what im trying to do

cheers

ken

PhiLho

Re: plotting gps please help

1 year ago

Well, you wrote " the coords do not print to screen", so I supposed it was the problem.
This is a controlP5 problem, so I suppose I should move the topic to Contributed Library section. Although you should have made a new topic, actually.

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