Develop Reference

Use the TranslateTransform and ScaleTransform of the Canvas or those of the Geometry shape while creating Custom Canvas Zoom and Pan?

I'm trying to create a custom Canvas by inherit from Canvas with the so famous feature Zoom and Pan.
I succeeded to Pan and Zoom using the mouse events (move and wheel), BUT : all the canvas (in my case black background) moved and not only my few shapes.
it's about the global Pan and Zoom and not drag&Drop one shape
so I added a custom Shape inherited from shape like this :
public class DataShape : Shape, INotifyPropertyChanged
{
public int ID;
public Geometry DataShapeGeometry;
public ScaleTransform ShapeScaleTransfrom;
public TranslateTransform ShapeTranslateTransform;
public TransformGroup ShapeTransformGroup;
protected override Geometry DefiningGeometry { get { return DataShapeGeometry; } }
public DataShape()
{
DataShapeGeometry = new LineGeometry(); // just to not having Null object that prevent creation of " DataShapeGeometry.Transform "
ShapeTransformGroup = new TransformGroup();
ShapeTranslateTransform = new TranslateTransform();
ShapeScaleTransfrom = new ScaleTransform();
ShapeTransformGroup.Children.Add(ShapeTranslateTransform);
ShapeTransformGroup.Children.Add(ShapeScaleTransfrom);
DataShapeGeometry.Transform = ShapeTransformGroup;
}
for the Custom Canvas I have this (part of the code)
first I used the _pan TranslateTransform as a global Transform, as I said it worked but all my Canvas moved, then i wonted to use the shapeTranslateTransform and the shapeScalTransform , no reaction but i confirmed that the values incremente properly (the zoom geting bigger and bigger , same for the offset, i even used a Textbox to show that :))
public class ZoomPanCanvas : Canvas
{
public static int Global_ID = 0;
public MainWindow w1;
public List<DataShape> selectedDataShapes;
public DataShape selectedShape;
private Point? dragStartPoint = null;
private Matrix transform = Matrix.Identity;
private TranslateTransform _pan = new TranslateTransform();
public ZoomPanCanvas()
{
this.RenderTransform = _pan;
this.MouseWheel += ZoomPanCanvas_MouseWheel;
this.MouseLeftButtonDown += ZoomPanCanvas_MouseLeftButtonDown;
this.MouseMove += ZoomPanCanvas_MouseMove;
this.MouseLeftButtonUp += ZoomPanCanvas_MouseLeftButtonUp;
}
public void RedrawAll()
{
this.InvalidateArrange();
}
#region EVENTS_METHOD
private void ZoomPanCanvas_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
this.Cursor = Cursors.Hand;
dragStartPoint = e.GetPosition(this);
}
bool b = false;int j = 0;
private void ZoomPanCanvas_MouseMove(object sender, MouseEventArgs e)
{
if (e.LeftButton == MouseButtonState.Pressed)
{
Point point = e.GetPosition(this);
/* this was working <--------------------------------------
_pan.X += point.X - dragStartPoint.Value.X;
_pan.Y += point.Y - dragStartPoint.Value.Y;*/
foreach (UIElement datashape in this.Children)
{
// it works we need to pan each shape
selectedShape = datashape as DataShape;
((TranslateTransform) (selectedShape.ShapeTransformGroup.Children[0])).X += point.X - dragStartPoint.Value.X;
((TranslateTransform)(selectedShape.ShapeTransformGroup.Children[0])).Y += point.Y - dragStartPoint.Value.Y;
//((selectedShape.DataShapeGeometry.Transform)as TranslateTransform).X += point.X - dragStartPoint.Value.X;
// ((selectedShape.DataShapeGeometry.Transform) as TranslateTransform).Y += point.Y - dragStartPoint.Value.Y;
}
dragStartPoint = point;
}
}
private void ZoomPanCanvas_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
this.Cursor = Cursors.Arrow;
dragStartPoint = null;
}
private void ZoomPanCanvas_MouseWheel(object sender, MouseWheelEventArgs e)
{
Point position = e.GetPosition(this);
// scale get only two values, it does'nt increment !
double scale = e.Delta > 0 ? 1.1 : (1.0 / 1.1);
//this.transform.ScaleAt(scale, scale, position.X, position.Y);
//this.RenderTransform = new MatrixTransform(this.transform);
foreach (UIElement datashape in this.Children)
{
// it works we need to pan each shape
selectedShape = datashape as DataShape;
//selectedShape.DataShapeGeometry.Transform.Value.Scale(scale, scale);
((ScaleTransform)(selectedShape.ShapeTransformGroup.Children[1])).ScaleX = ((ScaleTransform)(selectedShape.ShapeTransformGroup.Children[1])).ScaleX * scale;
((ScaleTransform)(selectedShape.ShapeTransformGroup.Children[1])).ScaleY = ((ScaleTransform)(selectedShape.ShapeTransformGroup.Children[1])).ScaleY * scale;
w1.TXT1.Text = ((ScaleTransform)(selectedShape.ShapeTransformGroup.Children[1])).ScaleX.ToString();
}
}
#endregion
}
I trayed to apply the GroupTransform to initialize all types of transform (Translate for Pan andScale for Zoom) in the Datashape Constructor.
I reached "selectedShape.ShapeTransformGroup.Children[]" from inside my ZoomPanCanvas i confirmed that values change but no impact in the interface.
I dare have a great expectation to create a sort of intelligent Cad Canvas (or like visio ).
I will not use ItemsControl, it's useful but when dealing with Algorithmic Geometry I prefer a straightforward simple canvas.
Many thanks

Zoom an image in a picture box

I know there are many discussion this topic already but still i could not find an answer. Hope someone have a idea.
I load a bitmap in a PictureBox (SizeMode Normal, DockStyle Fill) and use the Paint event to draw the image.
To zoom I use MouseWheel event and increase / decrease zoom factor (Like _zoomFac += 1). The goal is to zoom at the mouse position. So in the MouseWheel event I also save the mouse position (_imageZoomLocation). This is my code (only little test implementation):
public partial class Form1 : Form
{
private Image _image;
private float _zoomFac;
private PointF _imageZoomLocation;
public Form1()
{
InitializeComponent();
_image = null;
_zoomFac = 1F;
_imageZoomLocation = PointF.Empty;
pictureBox.MouseWheel += new MouseEventHandler(OnMouseWheel);
}
private void pb_Paint(object sender, PaintEventArgs e)
{
if (_image == null)
return;
e.Graphics.TranslateTransform(-_imageZoomLocation.X + _imageZoomLocation.X / _zoomFac, -_imageZoomLocation.Y + _imageZoomLocation.Y / _zoomFac);
e.Graphics.ScaleTransform(_zoomFac, _zoomFac, MatrixOrder.Append);
e.Graphics.DrawImage(_image, new Point(0,0));
}
private void fileToolStripMenuItem_Click(object sender, EventArgs e)
{
... Code for loading image
}
private void OnMouseWheel(object sender, MouseEventArgs e)
{
if (_image == null)
return;
_imageZoomLocation = e.Location;
if (e.Delta > 0)
_zoomFac += 1F;
else
if (_zoomFac - 1F < 1F)
_zoomFac = 1F;
else
_zoomFac -= 1F;
Refresh();
}
private void pb_MouseEnter(object sender, EventArgs e)
{
pictureBox.Focus();
}
}
This works well as long as _imageZoomLocation is not changed, means the mouse is not moved i can zoom in and out perfectly (I can change mouse position when zoom factor is 1 and everything still works). However when I move the mouse to different position in a zoomed state (e.g. zoom factor is 2) and scroll, the image jumpes once to a different position than the mouse is and after this "jump" everything works well again.
Can anyone explain this behaviour?

In the following line, you are dividing imageZoomLocation.X and .Y by the zoom factor only half the time. Instead, maybe you need a separate variable to keep the previous mouse location.
e.Graphics.TranslateTransform(-_imageZoomLocation.X + _imageZoomLocation.X / _zoomFac, _
-_imageZoomLocation.Y + _imageZoomLocation.Y / _zoomFac);

How to scroll Flow layout panel content as per mouse position

i have taken one Flow layout panel and placed multiple picture box inside in it. now i want when i will place my mouse at the right or left most edge of the Flow layout panel then rest of picture will scroll out. just think about windows 8 start screen where many tiles appear in screen and when we place mouse at right most edge on the screen then rest of the tiles scroll out. i want to simulate same thing in windows form with Flow layout panel.
i want my Flow layout panel will not show scroll bar but images will scroll out when i will place mouse right or left most part on the panel. here is my screen shot
some one told me to do it this way...here is bit code
Set AutoScrollPosition property in MouseMove event of Panel.
private void panel1_MouseMove(object sender, MouseEventArgs e)
{
panel1.AutoScrollPosition = new Point(e.X, e.Y);
}
but this trick was not good. AutoScrollPosition works when scroll bar is visible but in my case i do not want to show scroll bar with Flow layout panel. i want smooth scrolling images from left to right or right to left. anyone can help me to achieve what i am trying to do....if possible guide me with respect of coding. thanks
EDIT
Here i am giving my full code after modification following #Taw suggestion but it is not working fine....rather flickering found when picture move. anyway here is the full code.
namespace ScrollTest
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
flowLayoutPanel1.MouseMove += MouseScroll;
foreach (Control x in this.Controls)
{
if (x is PictureBox)
{
((PictureBox)x).MouseMove += MouseScroll;
}
}
}
int near = 33;
private void MouseScroll(object sender, MouseEventArgs e)
{
Point mouse = flowLayoutPanel1.PointToClient(MousePosition);
Rectangle C = flowLayoutPanel1.ClientRectangle;
int dLeft = mouse.X - C.Left;
int dTop = mouse.Y - C.Top;
int dRight = C.Right - mouse.X;
int dBottom = C.Bottom - mouse.Y;
int dX = dLeft < near ? dLeft : dRight < near ? -dRight : 0;
int dY = dTop < near ? dTop : dBottom < near ? -dBottom : 0;
if (dX != 0 | dY != 0) scrollFLP(dX, dY);
}
void scrollFLP(int deltaX, int deltaY)
{
flowLayoutPanel1.Left += getSpeedFromDistance(deltaX);
flowLayoutPanel1.Top += getSpeedFromDistance(deltaY);
System.Threading.Thread.Sleep(11);
}
int getSpeedFromDistance(int delta)
{
int sig = Math.Sign(delta);
int d = Math.Abs(delta);
if (d > near / 2) return sig;
else if (d > near / 3) return near / 10 * sig;
else if (d > near / 4) return near / 8 * sig;
else if (d > near / 5) return near / 5 * sig;
else return near * sig;
}
}
}
basically i am trying achieve something like suppose i have flow layout panel and which has many picture box inside it with many images as the screen shot but scroll bar should not show rather scroll will happen automatically when i will place my mouse at the top or bottom of the flow layout panel like carousel.
see this picture of your application
when place my mouse at the right end then it scroll and form background shown which i do not want. i want picture box will scroll & scroll upto last one not more than that.
any idea how to do it. thanks
2nd Edit
this code i added as per your suggestion
public Form1()
{
InitializeComponent();
for (int i = 0; i < 666; i++)
{
PictureBox pan = new PictureBox();
//pan.MouseMove += MouseScroll;
//pan.MouseLeave += outSideCheck;
pan.Size = new Size(75, 75);
pan.BackColor = Color.FromArgb(255, (i * 2) & 255, (i * 7) & 255, (i * 4) & 255);
flowLayoutPanel1.Controls.Add(pan);
}
//flowLayoutPanel1.MouseMove += MouseScroll;
//this.flowLayoutPanel1.MouseLeave += outSideCheck;
mouseScroller MSC = new mouseScroller();
MSC.registerControl(flowLayoutPanel1); // FLP = your FlowLayouPanel
MSC.timerSpeed = 5; // optional
MSC.nearness = 100; // optional
flowLayoutPanel1.AutoScroll = false;
}
now the apps doing wired behavior after adding new code. if i am making any mistake then guide me please. thanks

This is a two-part problem:
How to grab the event
How to scroll a FlowLayoutPanel with its scrollbars invisible.
Second first. It is not an easy task from what I found, unless you use a simple and rather common trick: Don't actually scroll it! Instead place it into a Panel and then control its position inside that Panel.
To do this you add a Panel panel1 to your Form, Dock or Anchor it as you need to and set its Autoscroll = false (!) (Which is not the way it is usually done, when you want to make, say a PictureBox scrollable. But we don't want the Panel to show it Scrollbars either.)
Set the FLP to its desired size and place it into the Panel, it obviously also has Autoscroll = false, and we're ready to tackle the other problem of setting up the event..:
First you add the MouseScroll event below to your code and then you hook every control up to it you want to work with the mouse move, namely the FLP:
flowLayoutPanel1.MouseMove += MouseScroll;
..and also each of your PictureBoxes, maybe like this
// your creation loop..
PictureBox pbox = new PictureBox();
pbox.MouseMove += MouseScroll; // <<--- hook into to the mousemove
pan.MouseLeave += outSideCheck; // <<--- hook into to the mouseleave
// .. do your stuff.. here I put some paint on to test..
pbox.BackColor = Color.FromArgb(255, 111, (i * 3) & 255, (i * 4) & 255);
flowLayoutPanel1.Controls.Add(pbox);
or however you create them..
Edit 2 I have changed my original code once more. It now includes an outside check, a check for moving towards the closest edge and a workaround for tha mousemove bug. It uses a Timer set to maybe 30ms. The speed mapping is in a function of its own.
flowLayoutPanel1.MouseMove += MouseScroll;
this.flowLayoutPanel1.MouseLeave += outSideCheck;
flowLayoutPanel1.AutoScroll = false;
int near = 33;
Point lastLocation = Point.Empty;
int dX = 0;
int dY = 0;
private void MouseScroll(object sender, MouseEventArgs e)
{
Point mouse = panel1.PointToClient(MousePosition);
Rectangle C = panel1.ClientRectangle;
// mouseMove has a bug, we need to workaround
if (mouse == lastLocation) return;
if (lastLocation == Point.Empty) { lastLocation = mouse; return; }
// distance from each edge
int dLeft = mouse.X - C.Left;
int dTop = mouse.Y - C.Top;
int dRight = C.Right - mouse.X;
int dBottom = C.Bottom - mouse.Y;
// relevant distances with sign
dX = dLeft < near ? dLeft : dRight < near ? -dRight : 0;
dY = dTop < near ? dTop : dBottom < near ? -dBottom : 0;
// we need the closest edge to check if we are moving in or out
List<int> edges = new List<int>() { dLeft, dTop, dRight, dBottom };
var closest = edges.IndexOf(edges.Min());
// if we are moving
if (dX != 0 | dY != 0)
// if moving out: go else stop going
if (!movingIn(mouse, closest)) timer1.Start(); else timer1.Stop();
// remember position
lastLocation = mouse;
}
bool movingIn(Point current, int Edge)
{
switch (Edge)
{
case 0: return current.X > lastLocation.X;
case 1: return current.Y > lastLocation.Y;
case 2: return current.X < lastLocation.X;
case 3: return current.Y < lastLocation.Y;
}
return false;
}
void scrollFLP(int deltaX, int deltaY)
{
flowLayoutPanel1.Left += getSpeedFromDistance(deltaX);
flowLayoutPanel1.Top += getSpeedFromDistance(deltaY);
Size C = panel1.ClientSize;
if (flowLayoutPanel1.Left > 1) { flowLayoutPanel1.Left = 0; timer1.Stop(); }
if (flowLayoutPanel1.Right < C.Width)
{ flowLayoutPanel1.Left = C.Width - flowLayoutPanel1.Width; timer1.Stop(); }
if (flowLayoutPanel1.Top > 1) { flowLayoutPanel1.Top = 0; timer1.Stop(); }
if (flowLayoutPanel1.Bottom < C.Height)
{ flowLayoutPanel1.Top = C.Height - flowLayoutPanel1.Height; timer1.Stop(); }
}
int getSpeedFromDistance(int delta)
{
int sig = Math.Sign(delta);
int d = Math.Abs(delta);
if (d > near / 2) return sig;
else if (d > near / 3) return 2 * sig;
else if (d > near / 4) return 4 * sig;
else if (d > near / 5) return 6 * sig;
else return 10 * sig;
}
private void timer1_Tick(object sender, EventArgs e)
{
if (insidePanel()) scrollFLP(dX, dY); else timer1.Stop();
}
bool insidePanel()
{
return panel1.ClientRectangle.Contains(panel1.PointToClient(MousePosition));
}
private void outSideCheck(object sender, EventArgs e)
{
if (!insidePanel()) {timer1.Stop(); lastLocation = Point.Empty;}
}
Of course you'll want to play with the various 'magic' numbers :-)
Stop code and direction check are now included.
As usual, key is to know precisely what you want.. I hope this gets you started on ways to achieve it!

It's been a while since this question was asked. I just encountered the problem. My scenario was a little different, but I still think it's a solution to the same problem (at worst a timer control can be used because autoscroll is not turned on).
Here is my scenario: I have one panel control (normal panel). I have an PictureBox in it that I made with zoom. I'm making rectangular selections on top of this image, and when the selections spilled out of the panel, my panel was supposed to slide in the direction I was selecting. (in my scenario, mouse is pressed)(also in my scenario, autoscroll is on). This is how I solved it without writing so much code:
I added two private variable for scroll position (Valid for the whole class scope).
private int xPos;
private int yPos;
private int speed = 5;
and I assigned them the current scroll positions when the form is loaded.
private void Form1_Load(object sender, EventArgs e)
{
//when I change the scrollbar manually or change with zoom I still
//need to add these lines to the related event
xPos = panel1.HorizontalScroll.Value;
yPos = panel1.VerticalScroll.Value;
}
and inside my picturebox's mousemove event
private void picturebox1_MouseMove(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left) {
Point mouse = panel1.PointToClient(MousePosition);
if (!panel1.ClientRectangle.Contains( mouse ))
{
Rectangle CRect = panel1.ClientRectangle;
int dLeft = mouse.X - CRect.Left;
int dRight = CRect.Right - mouse.X;
int dTop = mouse.Y - CRect.Top;
int dBottom = CRect.Bottom - mouse.Y;
if(dLeft < 0 && panel1.HorizontalScroll.Value > 0)
{
xPos = -panel1.AutoScrollPosition.X - speed;
}
if (dRight < 0 && panel1.HorizontalScroll.Value < panel1.HorizontalScroll.Maximum)
{
xPos = -panel1.AutoScrollPosition.X + speed;
}
if (dTop < 0 && panel1.VerticalScroll.Value > 0)
{
yPos = -panel1.AutoScrollPosition.Y - speed;
}
if (dBottom < 0 && panel1.VerticalScroll.Value < panel1.VerticalScroll.Maximum)
{
yPos = -panel1.AutoScrollPosition.Y + speed;
}
panel1.AutoScrollPosition = new Point(xPos, yPos);
}
}
}

Drawing Line to next point in realtime

My current program allows the user to click a point, then click another point (at least 20 pixels away) and draws a line between the 2 points. I've used a Polyline so that this can be done multiple times. Though the set of all the lines only appear after all the click are done.
void DrawingCanvas_MouseUp(object sender, MouseButtonEventArgs e) {
Point position = e.GetPosition(this);
if (leftList == null) {
//starting a new set
leftList.Add(position);
lastPoint = position;
return;
}
//calculate distance, i.e. end click
double a = lastPoint.X - position.X;
double b = lastPoint.Y - position.Y;
double distance = Math.Sqrt(a * a + b * b);
if (distance > 20) {
//continue to add to list
leftList.Add(position);
lastPoint = position;
} else {
//end of the line
paint();
leftList = new PointCollection();
}
}
private void paint() {
Polyline line = new Polyline();
line.Visibility = System.Windows.Visibility.Visible;
line.StrokeThickness = 2;
line.Stroke = System.Windows.Media.Brushes.Black;
line.Points = leftList;
myCanvas.Children.Add(line);
}
So my question is two-fold:
A) How do I make it so that after each click the new line is immediately added.
B) How do I render a line between the last point and where the mouse cursor is currently at (i.e. just before you choose your next point)

The following simple example starts drawing a new polyline when the left mouse button is pressed and the mouse is moved by the minimum point distance of 20, with the button kept pressed. It draws the last polyline segment (to the current mouse position) in either red or green, depending on its length. If the mouse button is released and the length of the new segment is >= 20, a new point is appended to the polyline. Otherwise the polyline is terminated, and a new polyline can be created.
private Polyline polyline;
private Polyline segment = new Polyline { StrokeThickness = 2 };
private void Canvas_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
if (polyline == null)
{
var canvas = (Canvas)sender;
var point = e.GetPosition(canvas);
// create new polyline
polyline = new Polyline { Stroke = Brushes.Black, StrokeThickness = 2 };
polyline.Points.Add(point);
canvas.Children.Add(polyline);
// initialize current polyline segment
segment.Stroke = Brushes.Red;
segment.Points.Add(point);
segment.Points.Add(point);
canvas.Children.Add(segment);
}
}
private void Canvas_MouseMove(object sender, MouseEventArgs e)
{
if (polyline != null)
{
// update current polyline segment
var canvas = (Canvas)sender;
segment.Points[1] = e.GetPosition(canvas);
var distance = (segment.Points[0] - segment.Points[1]).Length;
segment.Stroke = distance >= 20 ? Brushes.Green : Brushes.Red;
}
}
private void Canvas_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
if (polyline != null)
{
var canvas = (Canvas)sender;
segment.Points[1] = e.GetPosition(canvas);
var distance = (segment.Points[0] - segment.Points[1]).Length;
if (distance >= 20)
{
polyline.Points.Add(segment.Points[1]);
segment.Points[0] = segment.Points[1];
}
else
{
if (polyline.Points.Count < 2)
{
canvas.Children.Remove(polyline);
}
polyline = null;
segment.Points.Clear();
canvas.Children.Remove(segment);
}
}
}

please maintain a collection of points on every click. in collection you can add one class which will have two properties like StartPoint and EndPoint.
when the mouse is clicked first time just add one class object to collection having start point only.
and when you click the mouse next time, ad end point to the last object of the class and meanwhile create a new object and assign this point as its start point and add it to collection, after that call the paint function.

How can i modify the background of the chart

How can I remove the "-----Series1" text (top right, near button1)
How can I make the blue stepline thinker, and remove the background lines?
How can I draw color to the background, such as the area from y=0 to y=1 colored as grey.
How can I add mousewheel event, so that i can use Ctrl+mousewheel to zoom in and out the chart?
Thank you!

Below I have provided some example code to answer your questions. My answers to 3 and 4 are basic examples, and you will have to calculate the correct values for painting and zooming in your application.
private void button1_Click(object sender, EventArgs e)
{
setupChart();
}
private void setupChart()
{
// 1.
foreach (System.Windows.Forms.DataVisualization.Charting.Legend legend in chart1.Legends)
legend.Enabled = false;
// 2.
chart1.Series[0].BorderWidth = 5;
chart1.ChartAreas[0].AxisX.MajorGrid.Enabled = false;
chart1.ChartAreas[0].AxisY.MajorGrid.Enabled = false;
// 3.
chart1.Paint += new PaintEventHandler(chart1_Paint);
// 4.
chart1.MouseWheel += new MouseEventHandler(chart1_MouseWheel);
//chart must have focus for MouseWheel event to fire
chart1.Focus();
}
private void chart1_Paint(object sender, PaintEventArgs e)
{
//basic example of painting
//determine size of area to paint
Size areaSize = new Size(50, 50);
//determine location to paint
Point point = new Point(100, 450);
e.Graphics.FillRectangle(new SolidBrush(Color.Gray),
point.X, point.Y, areaSize.Width, areaSize.Height);
}
private void chart1_MouseWheel(object sender, MouseEventArgs e)
{
//basic example of zooming in and out
if (e.Delta > 0)
{
chart1.ChartAreas[0].AxisX.ScaleView.Zoom(
chart1.ChartAreas[0].AxisX.ScaleView.ViewMinimum / 2,
chart1.ChartAreas[0].AxisX.ScaleView.ViewMaximum / 2);
chart1.ChartAreas[0].AxisY.ScaleView.Zoom(
chart1.ChartAreas[0].AxisY.ScaleView.ViewMinimum / 2,
chart1.ChartAreas[0].AxisY.ScaleView.ViewMaximum / 2);
}
else
{
if (chart1.ChartAreas[0].AxisX.ScaleView.ViewMaximum <
chart1.ChartAreas[0].AxisX.Maximum ||
chart1.ChartAreas[0].AxisX.ScaleView.ViewMinimum >
chart1.ChartAreas[0].AxisX.Minimum)
{
chart1.ChartAreas[0].AxisX.ScaleView.Zoom(
chart1.ChartAreas[0].AxisX.ScaleView.ViewMinimum * 2,
chart1.ChartAreas[0].AxisX.ScaleView.ViewMaximum * 2);
chart1.ChartAreas[0].AxisY.ScaleView.Zoom(
chart1.ChartAreas[0].AxisY.ScaleView.ViewMinimum * 2,
chart1.ChartAreas[0].AxisY.ScaleView.ViewMaximum * 2);
}
else
{
chart1.ChartAreas[0].AxisX.ScaleView.ZoomReset();
chart1.ChartAreas[0].AxisY.ScaleView.ZoomReset();
}
}
}