I can successfully zoom x-only across all plots using the following code:
zg1.IsEnableHZoom = true;
zg1.IsEnableVZoom = false;
zg1.IsSynchronizeXAxes = true;
foreach (GraphPane gp in zg1.MasterPane.paneList)
{
> //What code can I put here?
}
My problem is that using this code, the Y-axis remains at a max and min based on the original view of the data. I want the Y-axis to autoscale so that the max and min is ONLY based on the data visible due to the x-axis zoom (per graph pane, of course). Is there some command, or brute force method, that I can use on each of the graph panes in the for loop shown above? Thanks ahead of time for anyone's help.
You can use this in the loop (assuming X Axis scale MinAuto and MaxAuto are false)
foreach (GraphPane gp in zg1.MasterPane.paneList)
{
gp.YAxis.Scale.MinAuto = true;
gp.YAxis.Scale.MaxAuto = true;
// This will force ZedGraph to calculate the Min and the Max of the Y axis
// based on the X axis visible range
gp.IsBoundedRanges = true;
}
zg1.MasterPane.AxisChange();
I had the same problem before and could not find a way other than to inspect all the curve points.
I added an event handler to the Paint event to do this, I'm sure there are ways this can be optimized.
Something like this:
private void graph_Paint(object sender, PaintEventArgs e)
{
double min = Double.MaxValue;
double max = Double.MinValue;
CurveItem curve = graph.GraphPane.CurveList[0];
for (int i = 0; i < curve.Points.Count; i++)
{
if (curve.Points[i].X > graph.GraphPane.XAxis.Scale.Min &&
curve.Points[i].X < graph.GraphPane.XAxis.Scale.Max)
{
min = Math.Min(curve.Points[i].Y, min);
max = Math.Max(curve.Points[i].Y, max);
}
}
if (min != Double.MaxValue)
{
graph.GraphPane.XAxis.Scale.Min = min;
graph.GraphPane.XAxis.Scale.Max = max;
}
}
Related
I'm trying to do wall collision for objects and I've followed a tutorial that offers one method of doing collision.
This is the tutorial: https://www.youtube.com/watch?v=yZU1QJJdxgs
Currently, if the object detects a wall, instead of moving it's full distance, it moves pixel by pixel until it's against the wall. This worked well until I started trying to rotate the object with image_rotate, because it caused objects to get stuck in walls by either sliding against them or if they rotated into them.
I fixed this by using draw_sprite_ext instead and changing the rotation of the sprite itself and not the mask, which worked for about 20 minutes until it started causing more problems.
///obj_player Step
//Initialise Variables
hor_speed = 0;
ver_speed = 0;
accelerationspeed = 0.2;
decelerationspeed = 0.2;
maxspeed = 3;
pointdirection = 0;
//Get player's input
key_right = keyboard_check(ord("D"))
key_left = -keyboard_check(ord("A"))
key_up = -keyboard_check(ord("W"))
key_down = keyboard_check(ord("S"))
pointdirection = point_direction(x,y,mouse_x,mouse_y) + 270
hor_movement = key_left + key_right;
ver_movement = key_up + key_down;
//horizontal acceleration
if !(abs(hor_speed) >= maxspeed) {
hor_speed += hor_movement * accelerationspeed;
}
//horizontal deceleration
if (hor_movement = 0) {
if !(hor_speed = 0) {
hor_speed -= (sign(hor_speed) * decelerationspeed)
}
}
//vertical acceleration
if !(abs(ver_speed) >= maxspeed) {
ver_speed += ver_movement * accelerationspeed;
}
//vertical deceleration
if (ver_movement = 0) {
if !(ver_speed = 0) {
ver_speed -= (sign(ver_speed) * decelerationspeed)
}
}
//horizontal collision
if (place_meeting(x+hor_speed,y,obj_wall)) {
while(!place_meeting(x+sign(hor_speed),y,obj_wall)) {
x += sign(hor_speed);
}
hor_speed = 0;
}
//vertical collision
if (place_meeting(x,y+ver_speed,obj_wall)) {
while(!place_meeting(x,y+sign(ver_speed),obj_wall)) {
y += sign(ver_speed);
}
ver_speed = 0;
}
//move the player
x += hor_speed;
y += ver_speed;
///obj_player Draw
//rotate to look at cursor
draw_sprite_ext(spr_player, 0, x,y,image_xscale,image_yscale, pointdirection, image_blend, image_alpha);
I think the best way to rotate objects is through image_rotate, and I'd like to do it without getting stuff stuck in walls. Can my current method of collision be adapted to do this, or should I attempt to do it in a different way?
Your code looks fine, but if you're going to be rotating objects then you would also need to consider having a "knock back mechanic." Reason being is the player could be sitting next to this wall and if you rotate the object over them so they cant move, its not a fun time being stuck.
So you 'could' have the object that's rotating do a check before rotating and if objects are in the way then either stop it or push them back so they cant be within range.
I am learning p5.js and wanted to generate a "static/noise texture" like so:
This is the code:
for (let y = 0; y < height; y++) {
for (let x = 0; x < width; x++) {
noiseVal = random(0,1);
stroke(255, noiseVal*255);
point(x,y);
}
}
This produces the desired outcome but it's obviously pretty slow since it has to iterate over every single pixel. What would be a more efficient way of doing this?
Your code is really not the best way to do with p5.js.
Take a look to the p5's pixels array.
When I run the following code, the function that use the pixels array run 100 times faster.
function setup() {
createCanvas(50, 50);
background(255);
let start, time;
start = performance.now();
noise_1();
time = performance.now() - start;
print("noise_1 : " + time);
start = performance.now();
noise_2();
time = performance.now() -start;
print("noise_2 : " + time);
}
// Your code
function noise_1() {
for (let y = 0; y < height; y++) {
for (let x = 0; x < width; x++) {
noiseVal = random(0,1);
stroke(noiseVal*255);
point(x,y);
}
}
}
// same with pixels array
function noise_2() {
loadPixels();
for (let i=0; i < pixels.length; i+=4){
noiseVal = random(0, 255);
pixels[i] = pixels[i+1] = pixels[i+2] = noiseVal;
}
updatePixels();
}
output :
noise_1 : 495.1
noise_2 : 5.92
To generate a single frame of static, you're going to have to iterate over each pixel. You could make your blocks larger than a single pixel, but that will only reduce the problem, not get rid of it completely.
Instead, you can probably get away with pre-computing a few images of static (let's say 10 or so). Save these as a file or to an off-screen buffer (the createGraphics() function is your friend), and then draw those images instead of drawing each pixel every frame.
i'm trying to make this interaction with keyboard for movement using some sprites and i got stuck with two situations.
1) The character movement is not going acording to the animation itself (it only begin moving after one second or so while it's already being animated). What i really want it to do is, to move without a "initial acceleration feeling" that i get because of this problem
2) I can't think of a way to make the character face the position it should be facing when the key is released. I'll post the code here, but since it need images to work correctly and is not so small i made a skecth available at this link if you want to check it out: https://www.openprocessing.org/sketch/439572
PImage[] reverseRun = new PImage [16];
PImage[] zeroArray = new PImage [16];
void setup(){
size(800,600);
//Right Facing
for(int i = 0; i < zeroArray.length; i++){
zeroArray[i] = loadImage (i + ".png");
zeroArray[i].resize(155,155);
}
//Left Facing
for( int z = 0; z < reverseRun.length; z++){
reverseRun[z] = loadImage ( "mirror" + z + ".png");
reverseRun[z].resize(155,155);
}
}
void draw(){
frameRate(15);
background(255);
imageMode(CENTER);
if(x > width+10){
x = 0;
} else if (x < - 10){
x = width;}
if (i >= zeroArray.length){
i = 3;} //looping to generate constant motiion
if ( z >= reverseRun.length){
z = 3;} //looping to generate constant motiion
if (isRight) {
image(zeroArray[i], x, 300);
i++;
} //going through the images at the array
else if (isLeft) {
image(reverseRun[z],x,300);
z++;
} going through the images at the array
else if(!isRight){
image(zeroArray[i], x, 300);
i = 0; } //"stoped" sprite
}
}
//movement
float x = 300;
float y = 300;
float i = 0;
float z = 0;
float speed = 25;
boolean isLeft, isRight, isUp, isDown;
void keyPressed() {
setMove(keyCode, true);
if (isLeft ){
x -= speed;
}
if(isRight){
x += speed;
}
}
void keyReleased() {
setMove(keyCode, false);
}
boolean setMove(int k, boolean b) {
switch (k) {
case UP:
return isUp = b;
case DOWN:
return isDown = b;
case LEFT:
return isLeft = b;
case RIGHT:
return isRight = b;
default:
return b; }
}
The movement problem is caused by your operating system setting a delay between key presses. Try this out by going to a text editor and holding down a key. You'll notice that a character shows up immediately, followed by a delay, followed by the character repeating until you release the key.
That delay is also happening between calls to the keyPressed() function. And since you're moving the character (by modifying the x variable) inside the keyPressed() function, you're seeing a delay in the movement.
The solution to this problem is to check which key is pressed instead of relying solely on the keyPressed() function. You could use the keyCode variable inside the draw() function, or you could keep track of which key is pressed using a set of boolean variables.
Note that you're actually already doing that with the isLeft and isRight variables. But you're only checking them in the keyPressed() function, which defeats the purpose of them because of the problem I outlined above.
In other words, move this block from the keyPressed() function so it's inside the draw() function instead:
if (isLeft ){
x -= speed;
}
if(isRight){
x += speed;
}
As for knowing which way to face when the character is not moving, you could do that using another boolean value that keeps track of which direction you're facing.
Side note: you should really try to properly indent your code, as right now it's pretty hard to read.
Shameless self-promotion: I wrote a tutorial on user input in Processing available here.
I have a web service that interfaces with the google maps API to generate a polygon on a google map. The service takes the GPS values and stores them for retrieval.
The problem is that when I try and use these values on my iPhone app the MKPolyline is just either a mess or a bunch of zig-zag lines.
Is there a way to make sense of these values so I can reconstruct the polygon?
My current code looks like this
private void GenerateMap()
{
var latCoord = new List<double>();
var longCoord = new List<double>();
var pad = AppDelegate.Self.db.GetPaddockFromCrop(crop);
mapMapView.MapType = MKMapType.Standard;
mapMapView.ZoomEnabled = true;
mapMapView.ScrollEnabled = false;
mapMapView.OverlayRenderer = (m, o) =>
{
if (o.GetType() == typeof(MKPolyline))
{
var p = new MKPolylineRenderer((MKPolyline)o);
p.LineWidth = 2.0f;
p.StrokeColor = UIColor.Green;
return p;
}
else
return null;
};
scMapType.ValueChanged += (s, e) =>
{
switch (scMapType.SelectedSegment)
{
case 0:
mapMapView.MapType = MKMapType.Standard;
break;
case 1:
mapMapView.MapType = MKMapType.Satellite;
break;
case 2:
mapMapView.MapType = MKMapType.Hybrid;
break;
}
};
if (pad.Boundaries != null)
{
var bounds = pad.Boundaries.OrderBy(t => t.latitude).ThenBy(t => t.longitude).ToList();
foreach (var l in bounds)
{
double lat = l.latitude;
double lon = l.longitude;
latCoord.Add(lat);
longCoord.Add(lon);
}
if (latCoord.Count != 0)
{
if (latCoord.Count > 0)
{
var coord = new List<CLLocationCoordinate2D>();
for (int i = 0; i < latCoord.Count; ++i)
{
var c = new CLLocationCoordinate2D();
c.Latitude = latCoord[i];
c.Longitude = longCoord[i];
coord.Add(c);
}
var line = MKPolyline.FromCoordinates(coord.ToArray());
mapMapView.AddOverlay(line);
mapMapView.SetVisibleMapRect(line.BoundingMapRect, true);
}
}
}
}
MKPolygon / MKPolygonRenderer gives the same sort of random line mess. The OrderBy LINQ makes no difference other than to make the random lines a zig-zag going up or down the view.
Since you don't know the order the points were captured in, you can't trace the actual path traveled around the perimeter of the paddock; this is why your polylines are turning into silly-walks all over the map. Lacking that information, you can at best make an educated guess.
Some possible heuristics you might want to try:
Take the average of all the points to get a "somewhere in the middle" point, then order by atan2(l.latitude - middle.latitude, l.longitude - middle.longitude). (Be careful, atan2 is undefined at (0, 0)!)
Take the convex hull of the points captured: for a relatively small number of points you can get away with the simple quadratic time Jarvis's march. This has the approximate effect of wrapping a notional rubber band around the outside of the map push-pins by discarding points that would form concavities, and should also give you the order of the remaining points.
//can set column widths using percentages
private void setPreferredTableColumnWidths(JTable table, double[] percentages)
{
Dimension tableDim = table.getSize();
double total = 0;
for(int i = 0; i < table.getColumnModel().getColumnCount(); i++)
total += percentages[i];
table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
for(int i = 0; i < table.getColumnModel().getColumnCount(); i++)
{
TableColumn column = table.getColumnModel().getColumn(i);
column.setPreferredWidth((int) (tableDim.width * (percentages[i] / total)));
}
}
I want to be able to change the widths of a JTable based on a percentage of the total width of the table. The above code looks like it should work, but I only get equal width columns when I call it using "setPreferredTableColumnWidths(table, new double[] {.01,.4,.2,.2,.2});"
What could be the problem?
Try to add the line:
table.doLayout();
At the end of the method.
Your code works fine but depending on where you call it the table may or may not have a width. In the constructor of a Panel (or whatever contains the table) there is not width yet.
I put the call to your method in the paint() method. But be sure to keep track and only call it once or it will resize the columns over and over.
#Override
public void paint(Graphics g) {
super.paint(g);
if(! this.initialSizeSet){
this.setPreferredTableColumnWidths(this.table, new double[] {0.1, 0.1, 0.5, 0.3});
this.initialSizeSet = true;
}
}