SP4 AxisLimits: WithPan() #2863
Description
Feature Suggestion
Feature description:
In my application, I want to use keys to be able to move the plots.
This is equivalent to creating a "Pan" function.
With Scott's help, I've written an event handler that does the job. However, it would be really handy to have an existing function that does this work.
For example, WithPan().
The arguments would be: X, Y, PanRatio.
PanRatio would be optional with a default value of 0.1.
Code example:
What would be nice:
This will move the pan up-right by one step.
The step corresponds to 10% of the display axis limits (default value).
var limits = formsPlot1.Plot.GetAxisLimits();
var newLimits = limits.WithPan(X: 1, Y: 1);
formsPlot1.Plot.SetAxisLimits(newLimits);This will move the pan down by one step.
The step corresponds to 50% of the display axis limits.
var limits = formsPlot1.Plot.GetAxisLimits();
var newLimits = limits.WithPan(Y: -1, PanRatio: 0.5);
formsPlot1.Plot.SetAxisLimits(newLimits);Here is the code I wrote for my application.
private void formsPlot_KeyDown(object sender, KeyEventArgs e)
{
// read current limits
var limits = formsPlot1.Plot.GetAxisLimits();
double limitXMax = limits.XMax;
double limitXMin = limits.XMin;
double limitYMax = limits.YMax;
double limitYMin = limits.YMin;
double XStep = (limitXMax - limitXMin) * 0.1;
double YStep = (limitYMax - limitYMin) * 0.1;
switch (e.KeyCode)
{
case Keys.F: // fit view
formsPlot1.Plot.AxisAuto();
break;
case Keys.Z: // pan Y up
limitYMax += YStep;
limitYMin += YStep;
formsPlot1.Plot.SetAxisLimits(yMax: limitYMax, yMin: limitYMin);
break;
case Keys.S: // pan Y down
limitYMax -= YStep;
limitYMin -= YStep;
formsPlot1.Plot.SetAxisLimits(yMax: limitYMax, yMin: limitYMin);
break;
case Keys.Q: // pan X left
limitXMax -= XStep;
limitXMin -= XStep;
formsPlot1.Plot.SetAxisLimits(xMax: limitXMax, xMin: limitXMin);
break;
case Keys.D: // pan X right
limitXMax += XStep;
limitXMin += XStep;
formsPlot1.Plot.SetAxisLimits(xMax: limitXMax, xMin: limitXMin);
break;
}
formsPlot1.Refresh();
// event has been handled
e.Handled = true;
}