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So I've imported a maze image (png) as the background of my canvas, and drawn lines over the corresponding lines in the image in p5. I've created a sprite which is my 'character' and it's just a small image, and all it's doing at the moment is moving with the arrow keys on top of the maze image. I want this to move through this maze and not go through any of these lines. I'm sure its a really simple answer but I can't wrap my head around it. Here is my code:
var spr;
var slimeMould;
var maze;
var line1;
var line2;
var line3;
var line4;
var line5;
var line6;
var line7;
var line8;
var line9;
var line10;
var line11;
var line12;
var line13;
var line14;
var line15;
var line16;
var line17;
function preload () {
slimeMould = loadImage("assets/slimemould-01.png");
maze = loadImage("assets/maze-02.png");
}
function setup() {
createCanvas(1000, 1000);
imageMode(CENTER)
spr = createSprite(595, 100);
spr.addImage(slimeMould);
}
function draw() {
background(10);
fill(255);
noStroke();
image(maze,width/2,height/2);
textAlign(CENTER, CENTER);
textSize(25);
text("find the shortest route to the food!", width/2, height*0.79);
drawSprites();
strokeWeight(15);
stroke(255);
line1 = line(86,168,460,168);
line2 = line(460,168,460,265);
line3 = line(460,265,310,265);
line4 = line(310,265,310,220);
line5 = line(310,220,380,220);
line6 = line(86,168,86,730);
line7 = line(140,168,140,220);
line8 = line(240,220,240,410);
line9 = line(140,260,240,260);
line10 = line(140,260,140,360);
line11 = line(140,360,190,360);
line12 = line(190,360,190,330);
line13 = line(86,410,140,410);
line14 = line(140,410,140,508);
line15 = line(86,553,125,553);
line16 = line(125,553,125,619);
line17 = line(125,619,260,619);
}
function keyPressed() {
if (keyCode == RIGHT_ARROW) {
spr.setSpeed(1.75, 0);
}
else if (keyCode == DOWN_ARROW) {
spr.setSpeed(1.75, 90);
}
else if (keyCode == LEFT_ARROW) {
spr.setSpeed(1.75, 180);
}
else if (keyCode == UP_ARROW) {
spr.setSpeed(1.75, 270);
}
return false;
}
function keyReleased() {
if (keyCode == RIGHT_ARROW) {
spr.setSpeed(0,0);
}
else if (keyCode == DOWN_ARROW) {
spr.setSpeed(0,0);
}
else if (keyCode == LEFT_ARROW) {
spr.setSpeed(0,0);
}
else if (keyCode == UP_ARROW) {
spr.setSpeed(0,0);
}
return false;
}
You're looking for collision detection. Specifically it sounds like you want line-rectangle collision detection. Googling "line rectangle collision detection" will return a ton of results, including:
How to check if line segment intersects a rectangle?
Line intersection with AABB Rectangle?
How to know if a line intersects a rectangle
How to test if a line segment intersects an axis-aligned rectange in 2D?
But basically, it sounds like the general approach is to break your rectangle down into 4 lines and then do line-line intersection detection. Another option would be to treat the lines in your maze as rectangles and then do rectangle-rectangle collision detection.
For developing a side-scrolling platform 2D game I want to implement a moving camera class, the reason of using the class instead of moving the whole map is that I'll have to use too many objects at once witch will cause a lag. I cannot let that happen.
There's a nice algorithm for handling the camera, when player is moving further than the width of the screen then camera moves on players direction until he is once again in the middle of the screen, I've been working several days for making this algorithm work however there's been no success.
// Main
public class Camera
{
protected float _zoom;
protected Matrix _transform;
protected Matrix _inverseTransform;
//The zoom scalar (1.0f = 100% zoom level)
public float Zoom
{
get { return _zoom; }
set { _zoom = value; }
}
// Camera View Matrix Property
public Matrix Transform
{
get { return _transform; }
set { _transform = value; }
}
// Inverse of the view matrix,
// can be used to get
// objects screen coordinates
// from its object coordinates
public Matrix InverseTransform
{
get { return _inverseTransform; }
}
public Vector2 Pos;
// Constructor
public Camera()
{
_zoom = 2.4f;
Pos = new Vector2(0, 0);
}
// Update
public void Update(GameTime gameTime)
{
//Clamp zoom value
_zoom = MathHelper.Clamp(_zoom, 0.0f, 10.0f);
//Create view matrix
_transform = Matrix.CreateScale(new Vector3(_zoom, _zoom, 1)) *
Matrix.CreateTranslation(Pos.X, Pos.Y, 0);
//Update inverse matrix
_inverseTransform = Matrix.Invert(_transform);
}
}
This is the camera class I made for handling the screen, it's main purpose is to resize the screen, more precisely to zoom in and out whenever I want to change my screen, (Title screen, Playing screen, Game over, and like that.)
Moving the camera is quite simple with keys, like this.
if (keyState.IsKeyDown(Keys.D))
Cam.Pos.X -= 20;
if (keyState.IsKeyDown(Keys.A))
Cam.Pos.X += 20;
if (keyState.IsKeyDown(Keys.S))
Cam.Pos.Y -= 20;
if (keyState.IsKeyDown(Keys.W))
Cam.Pos.Y += 20;
And ofc. the drawing method witch apply the camera.
spriteBatch.Begin(SpriteSortMode.Texture, BlendState.AlphaBlend, null, null, null, null, Cam.Transform);
Here comes the part when I stop, so what I want to do is make something like 2 2D rooms. By Room I mean the place where I usually place objects. like this "Vector2(74, 63)" So I want to create a place where I could draw items that would stick to the screen and wouldn't move, and make the screen bounds that would make my algorithm to work, witch will be always on screen and as an addition it will check if one of the borders of the screen "room" reaches the certain coordinates of the map "room".
I think that the reason for that would be obvious because I don't want player to move camera outside the map when he reaches the wall, otherwise the player would already see a part of the next map where he will be transformed.
The reason of drawing both maps next to each other is again to reduce the loading time so player wouldn't have to wait for playing the next map.
Alright, so I've run into more troubles than I expected so I'll add extra information and will start with the player class:
// Main
public class Player
{
public Texture2D AureliusTexture;
public Vector2 position;
public Vector2 velocity;
public Vector2 PosForTheCam; // Variable that holds value for moving the camera
protected Vector2 dimensions;
protected CollisionPath attachedPath;
const float GRAVITY = 18.0f;
const float WALK_VELOCITY = 120f;
const float JUMP_VELOCITY = -425.0f;
// Constructor
public Player()
{
dimensions = new Vector2(23, 46);
position = new Vector2(50, 770);
}
public void Update(float deltaSeconds, List<CollisionPath> collisionPaths)
{
#region Input handling
KeyboardState keyState = Keyboard.GetState();
if (keyState.IsKeyDown(Keys.Left))
{
velocity.X = -WALK_VELOCITY;
}
else if (keyState.IsKeyDown(Keys.Right))
{
velocity.X = WALK_VELOCITY;
}
else
{
velocity.X = 0;
}
if (attachedPath != null && keyState.IsKeyDown(Keys.Space))
{
velocity.Y = JUMP_VELOCITY;
attachedPath = null;
}
velocity.Y += GRAVITY;
#endregion
#region Region of handling the camera based on Player
PosForTheCam.X = velocity.X;
#endregion
#region Collision checking
if (velocity.Y >= 0)
{
if (attachedPath != null)
{
position.X += velocity.X * deltaSeconds;
position.Y = attachedPath.InterpolateY(position.X) - dimensions.Y / 2;
velocity.Y = 0;
if (position.X < attachedPath.MinimumX || position.X > attachedPath.MaximumX)
{
attachedPath = null;
}
}
else
{
Vector2 footPosition = position + new Vector2(0, dimensions.Y / 2);
Vector2 expectedFootPosition = footPosition + velocity * deltaSeconds;
CollisionPath landablePath = null;
float landablePosition = float.MaxValue;
foreach (CollisionPath path in collisionPaths)
{
if (expectedFootPosition.X >= path.MinimumX && expectedFootPosition.X <= path.MaximumX)
{
float pathOldY = path.InterpolateY(footPosition.X);
float pathNewY = path.InterpolateY(expectedFootPosition.X);
if (footPosition.Y <= pathOldY && expectedFootPosition.Y >= pathNewY && pathNewY < landablePosition)
{
landablePath = path;
landablePosition = pathNewY;
}
}
}
if (landablePath != null)
{
velocity.Y = 0;
footPosition.Y = landablePosition;
attachedPath = landablePath;
position.X += velocity.X * deltaSeconds;
position.Y = footPosition.Y - dimensions.Y / 2;
}
else
{
position = position + velocity * deltaSeconds;
}
}
}
else
{
position += velocity * deltaSeconds;
attachedPath = null;
}
#endregion
}
}
So I state it clear that I asked my friend to do most of it because I wanted to handle the gravity and the slopes so we made it work similar like in Unity. And he happened to know how to do that.
And so I'll add the Update method that handles the camera from the Main Class.
MM.Update(gameTime); // Map Managher update function for map handling
Cam.Update(gameTime); // Camera update
Cam.Zoom = 2.4f; // Sets the zoom level for the title screen
// Takes the start position for camera in map and then turns off the update
// so the camera position can be changed. Else it would just keep an infinite
// loop and we couldn't change the camera.
if (StartInNewRoom)
{
Cam.Pos = MM.CameraPosition; // Applys the camera position value from the map manager class
StartInNewRoom = false;
}
I am unsure how to handle the camera, like I used your method and the result often ended up that camera moves by itself or it doesn't move at all.
If you don't want objects to move with the camera like a HUD you need a second spriteBatch.Begin() without your camera matrix which you draw after your actual scene.
To make the camera not move out of the map you could use some kind of collision detection. Just calculate the right border of your camera. It depends where the origin of your camera is.
Is your camera matrix working like this? Because the position should be negative or it will move in the wrong direction.
This is how mine looks like.
return Matrix.CreateTranslation(new Vector3(-camera.position.X, -camera.position.Y, 0)) *
Matrix.CreateRotationZ(Rotation) * Matrix.CreateScale(Zoom) *
Matrix.CreateTranslation(new Vector3(Viewport.Width * 0.5f, Viewport.Height * 0.5f, 0));
Viewport.Width/Height * 0.5 centers you camera.
You can also apply this behind your Pos.X/Y
To Camera follows player
public void Update(Player player)
{
//Clamp zoom value
_zoom = MathHelper.Clamp(_zoom, 0.0f, 10.0f);
//Create view matrix
_transform = Matrix.CreateScale(new Vector3(_zoom, _zoom, 1)) *
Matrix.CreateTranslation(player.Pos.X, player.Pos.Y, 0);
//Update inverse matrix
_inverseTransform = Matrix.Invert(_transform);
}
I work with the kinect. My goal is to store the values gives me the kinect for the location of the body (head,hand etc). I have written some code but I can not understand what values should save and how.I want to store in the db or in a txt file the position of the head,hands and foots.I want the data to understand the movements of the person who stand in front of kinect.For example if someone move her hand the kinect will sent a value.I must store it and understand and to understand the move taken.Sorry for the few info
here is my code:
using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
using Microsoft.Kinect;
using System.Linq;
using System.IO;
namespace KinectSkeletonApplication1
{
public partial class MainWindow : Window
{
//Instantiate the Kinect runtime. Required to initialize the device.
//IMPORTANT NOTE: You can pass the device ID here, in case more than one Kinect device is connected.
KinectSensor sensor = KinectSensor.KinectSensors[0];
byte[] pixelData;
Skeleton[] skeletons;
public MainWindow()
{
InitializeComponent();
///////////////////////////////////
///////////////////////////////
//Runtime initialization is handled when the window is opened. When the window
//is closed, the runtime MUST be unitialized.
this.Loaded += new RoutedEventHandler(MainWindow_Loaded);
this.Unloaded += new RoutedEventHandler(MainWindow_Unloaded);
sensor.ColorStream.Enable();
sensor.SkeletonStream.Enable();
}
void runtime_SkeletonFrameReady(object sender, SkeletonFrameReadyEventArgs e)
{
bool receivedData = false;
using (SkeletonFrame SFrame = e.OpenSkeletonFrame())
{
if (SFrame == null)
{
// The image processing took too long. More than 2 frames behind.
}
else
{
skeletons = new Skeleton[SFrame.SkeletonArrayLength];
SFrame.CopySkeletonDataTo(skeletons);
receivedData = true;
}
}
if (receivedData)
{
Skeleton currentSkeleton = (from s in skeletons
where s.TrackingState == SkeletonTrackingState.Tracked
select s).FirstOrDefault();
if (currentSkeleton != null)
{
SetEllipsePosition(head, currentSkeleton.Joints[JointType.Head]);
SetEllipsePosition(leftHand, currentSkeleton.Joints[JointType.HandLeft]);
SetEllipsePosition(rightHand, currentSkeleton.Joints[JointType.HandRight]);
SetEllipsePosition(shoulder_center, currentSkeleton.Joints[JointType.ShoulderCenter]);
}
}
}
//This method is used to position the ellipses on the canvas
//according to correct movements of the tracked joints.
//IMPORTANT NOTE: Code for vector scaling was imported from the Coding4Fun Kinect Toolkit
//available here: http://c4fkinect.codeplex.com/
//I only used this part to avoid adding an extra reference.
private void SetEllipsePosition(Ellipse ellipse, Joint joint)
{
Microsoft.Kinect.SkeletonPoint vector = new Microsoft.Kinect.SkeletonPoint();
vector.X = ScaleVector(640, joint.Position.X);
vector.Y = ScaleVector(480, -joint.Position.Y);
vector.Z = joint.Position.Z;
Joint updatedJoint = new Joint();
updatedJoint = joint;
updatedJoint.TrackingState = JointTrackingState.Tracked;
updatedJoint.Position = vector;
Canvas.SetLeft(ellipse, updatedJoint.Position.X);
Canvas.SetTop(ellipse, updatedJoint.Position.Y);
}
private float ScaleVector(int length, float position)
{
float value = (((((float)length) / 1f) / 2f) * position) + (length / 2);
if (value > length)
{
return (float)length;
}
if (value < 0f)
{
return 0f;
}
string r = Convert.ToString(value);
string path = #"C:\Test\MyTest.txt";
// This text is added only once to the file.
if (!File.Exists(path))
{
// Create a file to write to.
string createText = "Hello and Welcome" + Environment.NewLine;
File.WriteAllText(path, createText);
}
// This text is always added, making the file longer over time
// if it is not deleted.
//string appendText = "This is extra text" + Environment.NewLine;
File.AppendAllText(path, r);
// Open the file to read from.
string readText = File.ReadAllText(path);
return value;
}
void MainWindow_Unloaded(object sender, RoutedEventArgs e)
{
sensor.Stop();
}
void MainWindow_Loaded(object sender, RoutedEventArgs e)
{
sensor.SkeletonFrameReady += runtime_SkeletonFrameReady;
sensor.ColorFrameReady += runtime_VideoFrameReady;
sensor.Start();
}
void runtime_VideoFrameReady(object sender, ColorImageFrameReadyEventArgs e)
{
bool receivedData = false;
using (ColorImageFrame CFrame = e.OpenColorImageFrame())
{
if (CFrame == null)
{
// The image processing took too long. More than 2 frames behind.
}
else
{
pixelData = new byte[CFrame.PixelDataLength];
CFrame.CopyPixelDataTo(pixelData);
receivedData = true;
}
}
if (receivedData)
{
BitmapSource source = BitmapSource.Create(640, 480, 96, 96,
PixelFormats.Bgr32, null, pixelData, 640 * 4);
videoImage.Source = source;
}
}
}
}
I think what you are looking for is getting the X, Y, Z coordiantes for certain Joints?
In this case add this code:
Vector3D ShoulderCenter = new Vector3D(skeleton.Joints[JointType.ShoulderCenter].Position.X, skeleton.Joints[JointType.ShoulderCenter].Position.Y, skeleton.Joints[JointType.ShoulderCenter].Position.Z);
Vector3D RightShoulder = new Vector3D(skeleton.Joints[JointType.ShoulderRight].Position.X, skeleton.Joints[JointType.ShoulderRight].Position.Y, skeleton.Joints[JointType.ShoulderRight].Position.Z);
Vector3D LeftShoulder = new Vector3D(skeleton.Joints[JointType.ShoulderLeft].Position.X, skeleton.Joints[JointType.ShoulderLeft].Position.Y, skeleton.Joints[JointType.ShoulderLeft].Position.Z);
Vector3D RightElbow = new Vector3D(skeleton.Joints[JointType.ElbowRight].Position.X, skeleton.Joints[JointType.ElbowRight].Position.Y, skeleton.Joints[JointType.ElbowRight].Position.Z);
Vector3D LeftElbow = new Vector3D(skeleton.Joints[JointType.ElbowLeft].Position.X, skeleton.Joints[JointType.ElbowLeft].Position.Y, skeleton.Joints[JointType.ElbowLeft].Position.Z);
Vector3D RightWrist = new Vector3D(skeleton.Joints[JointType.WristRight].Position.X, skeleton.Joints[JointType.WristRight].Position.Y, skeleton.Joints[JointType.WristRight].Position.Z);
Vector3D LeftWrist = new Vector3D(skeleton.Joints[JointType.WristLeft].Position.X, skeleton.Joints[JointType.WristLeft].Position.Y, skeleton.Joints[JointType.WristLeft].Position.Z);
This only defines the Vectors for the upper Body part as you can see. Just add the missing joints the way I did it.
You need following assemblies:
using System.Windows.Media;
using Microsoft.Kinect.Toolkit.Fusion;
using System.Windows.Media.Media3D;
as basis for my GPS functionality I've taken HelloMap3D Example of Nutiteq (Thx Jaak) and I adapted to show my current GPS position light different of this example, so, no growing yelow circles but a fix blue translucent circle with a center point as my current Position and works fine except the update. It should erase the past position if location is changed, so that
this update happens as in the example in the method onLocationChanged
This is the code in my Main Activity
protected void initGps(final MyLocationCircle locationCircle) {
final Projection proj = mapView.getLayers().getBaseLayer().getProjection();
locationListener = new LocationListener() {
#Override
public void onLocationChanged(Location location) {
locationCircle.setLocation(proj, location);
locationCircle.setVisible(true);
}
// Another Methods...
}
}
I have adapted MyLocationCircle Class like this
public void update() {
//Draw center with a drawable
Bitmap bitmapPosition = BitmapFactory.decodeResource(activity.getResources(), R.drawable.ic_home);
PointStyle pointStyle = PointStyle.builder().setBitmap(bitmapPosition).setColor(Color.BLUE).build();
// Create/update Point
if ( point == null ) {
point = new Point(circlePos, null, pointStyle, null);
layer.add(point);
} else { // We just have to change the Position to actual Position
point.setMapPos(circlePos);
}
point.setVisible(visible);
// Build closed circle
circleVerts.clear();
for (float tsj = 0; tsj <= 360; tsj += 360 / NR_OF_CIRCLE_VERTS) {
MapPos mapPos = new MapPos(circleScale * Math.cos(tsj * Const.DEG_TO_RAD) + circlePos.x, circleScale * Math.sin(tsj * Const.DEG_TO_RAD) + circlePos.y);
circleVerts.add(mapPos);
}
// Create/update line
if (circle == null) {
LineStyle lineStyle = LineStyle.builder().setWidth(0.05f).setColor(Color.BLUE).build();
PolygonStyle polygonStyle = PolygonStyle.builder().setColor(Color.BLUE & 0x80FFFFFF).setLineStyle(lineStyle).build();//0xE0FFFF
circle = new Polygon(circleVerts, null, polygonStyle, circle_data);
layer.add(circle);
} else {
circle.setVertexList(circleVerts);
}
circle.setVisible(visible);
}
public void setVisible(boolean visible) {
this.visible = visible;
}
public void setLocation(Projection proj, Location location) {
circlePos = proj.fromWgs84(location.getLongitude(), location.getLatitude());
projectionScale = (float) proj.getBounds().getWidth();
circleRadius = location.getAccuracy();
// Here is the most important modification
update();
}
So, each time our Position changes is called onLocationChanged(Location location) Method and there will be called locationCircle.setLocation(location) and last there, it will be called update called.
The questions are, What am I making wrong? and How can I solve it?
Thank you in advance.
You create and add new circle with every update. You should reuse single one, just update vertexes with setVertexList(). In particular this line should be outside onLocationChanged cycle, somewhere in initGPS perhaps:
circle = new Polygon(circleVerts, null, polygonStyle, circle_data);
Is it possible that the axis scale outside the graph could be scale using the mouse event "mouse_down and hold" and move up or down in y-axis the same with the x-axis move left or right? ex. when I trigger MouseDownEvent and hold the x-axis scale 0.6 or at the space along with that scale and move it to the right, scale should scroll depend in the chartfraction? could you post an example? Thanks in advance!
Separately panning and zooming Y axises can be achieved using the mouse events of ZedGraph: MouseDownEvent, MouseMoveEvent, MouseUpEvent and MouseWheel events (credits go to a colleague of mine).
It works with multiple GraphPanes and multiple Y axises.
The MouseMoveEvent is used to shift the Min and the Max of an Y axis when the mouse is moved while its button is pressed. If not, it is used to get the reference of the Y axis object the mouse is hovering on.
The MouseDownEvent is used to initiate an axis pan operation.
The MouseWheel is used to perform a zoom on an Y axis.
And the MouseUpEvent is used to clean things when zooming and panning operations are finished.
Here is the code :
// The axis that is currently hovered by the mouse
YAxis hoveredYAxis;
// The graphpane that contains the axis
GraphPane foundPane;
// The scale of the axis before it is panned
double movedYAxisMin;
double movedYAxisMax;
// The Y on the axis when the panning operation is starting
float movedYAxisStartY;
void z_MouseWheel(object sender, MouseEventArgs e)
{
if (hoveredYAxis != null)
{
var direction = e.Delta < 1 ? -.05f : .05f;
var increment = direction * (hoveredYAxis.Scale.Max - hoveredYAxis.Scale.Min);
var newMin = hoveredYAxis.Scale.Min + increment;
var newMax = hoveredYAxis.Scale.Max - increment;
hoveredYAxis.Scale.Min = newMin;
hoveredYAxis.Scale.Max = newMax;
foundPane.AxisChange();
z.Invalidate();
}
}
bool z_MouseUpEvent(ZedGraphControl sender, MouseEventArgs e)
{
hoveredYAxis = null;
return false;
}
bool z_MouseMoveEvent(ZedGraphControl sender, MouseEventArgs e)
{
var pt = e.Location;
if (e.Button == System.Windows.Forms.MouseButtons.Left)
{
if (hoveredYAxis != null)
{
var yOffset = hoveredYAxis.Scale.ReverseTransform(pt.Y) - hoveredYAxis.Scale.ReverseTransform(movedYAxisStartY);
hoveredYAxis.Scale.Min = movedYAxisMin - yOffset;
hoveredYAxis.Scale.Max = movedYAxisMax - yOffset;
sender.Invalidate();
return true;
}
}
else
{
var foundObject = findZedGraphObject(null);
hoveredYAxis = foundObject as YAxis;
if (hoveredYAxis != null)
{
z.Cursor = Cursors.SizeNS;
return true;
}
else
{
if (z.IsShowPointValues)
{
z.Cursor = Cursors.Cross;
return false;
}
else
{
z.Cursor = Cursors.Default;
return true;
}
}
}
return false;
}
bool z_MouseDownEvent(ZedGraphControl sender, MouseEventArgs e)
{
if (e.Button == System.Windows.Forms.MouseButtons.Left)
{
if (hoveredYAxis != null)
{
movedYAxisStartY = e.Location.Y;
movedYAxisMin = hoveredYAxis.Scale.Min;
movedYAxisMax = hoveredYAxis.Scale.Max;
return true;
}
}
return false;
}
This is a helper that factorizes a bit the object find operations of ZedGraph.
object findZedGraphObject(GraphPane pane = null)
{
var pt = zgc.PointToClient(Control.MousePosition);
if (pane == null)
{
foundPane = zgc.MasterPane.FindPane(pt);
if (foundPane != null)
{
object foundObject;
int forget;
using (var g = zgc.CreateGraphics())
if (foundPane.FindNearestObject(pt, g, out foundObject, out forget))
return foundObject;
}
}
return null;
}
If I understand your question correctly, here's my response:
zedgraph has got an in-built function called "Pan", you could change the scale of x & y axis.
Place the cursor within the 'chart area'
Hold the 'ctrl' button & move the mouse towards x & y directions to change the scale.
you could get back to original state by 'Un-Pan' (Context Menu)
Cheers..:)
Do You want to create a ScrollBar?
zedGraphControl1.IsShowHScrollbar = true;
//Set borders for the scale
zedGraphControl1.GraphPane.XAxis.Scale.Max = Xmax;
zedGraphControl1.GraphPane.XAxis.Scale.Min = Xmin;