控制Winforms中的调整大小问题（DPI缩放）
我有一个winforms App.It使用自定义旋钮控制。该应用程序最初设计在20英寸720P显示器上。现在谈到1080P 15英寸笔记本电脑有一个缩放问题。为了克服这一点，我已经设置了AutoscaleMode某些表单的属性DPI。这对大多数表单都很有效。但是当下面的表单使用自定义旋钮控件时，该区域周围会留下一个白色的间距。 / p>
这是知识控制的完整代码
using System;
using System.Collections;
using System.ComponentModel;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Data;
using System.Windows.Forms;
namespace KnobControl
{
// A delegate type for hooking up ValueChanged notifications.
public delegate void ValueChangedEventHandler(object Sender);
/// <summary>
/// Summary description for KnobControl.
/// </summary>
public class KnobControl : System.Windows.Forms.UserControl
{
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.Container components = null;
private int _Minimum = 0;
private int _Maximum = 25;
private int _LargeChange = 5;
private int _SmallChange = 1;
private bool _ShowSmallScale = false;
private bool _ShowLargeScale = true;
private bool _isFocused = false;
private int _Value = 0;
private bool isKnobRotating = false;
private Rectangle rKnob ;
private Point pKnob;
private Rectangle rScale;
private Pen DottedPen;
Brush bKnob;
Brush bKnobPoint;
//-------------------------------------------------------
// declare Off screen image and Offscreen graphics
//-------------------------------------------------------
private Image OffScreenImage;
private Graphics gOffScreen;
//-------------------------------------------------------
// An event that clients can use to be notified whenever
// the Value is Changed.
//-------------------------------------------------------
public event ValueChangedEventHandler ValueChanged;
//-------------------------------------------------------
// Invoke the ValueChanged event; called when value
// is changed
//-------------------------------------------------------
protected virtual void OnValueChanged(object sender)
{
if (ValueChanged != null)
ValueChanged(sender);
}
/// <summary>
/// Shows Small Scale marking.
/// </summary>
public bool ShowSmallScale
{
get{return _ShowSmallScale;}
set
{
_ShowSmallScale = value;
// need to redraw
Refresh();
}
}
/// <summary>
/// Shows Large Scale marking
/// </summary>
public bool ShowLargeScale
{
get{return _ShowLargeScale;}
set
{
_ShowLargeScale = value;
// need to redraw
Refresh();
}
}
/// <summary>
/// Minimum Value for knob Control
/// </summary>
public int Minimum
{
get{return _Minimum;}
set{_Minimum = value;}
}
/// <summary>
/// Maximum value for knob control
/// </summary>
public int Maximum
{
get{return _Maximum;}
set{_Maximum = value;}
}
/// <summary>
/// value set for large change
/// </summary>
public int LargeChange
{
get{return _LargeChange;}
set
{
_LargeChange = value;
Refresh();
}
}
/// <summary>
/// value set for small change.
/// </summary>
public int SmallChange
{
get{return _SmallChange;}
set
{
_SmallChange = value;
Refresh();
}
}
/// <summary>
/// Current Value of knob control
/// </summary>
public int Value
{
get{return _Value;}
set
{
_Value = value;
// need to redraw
Refresh();
// call delegate
OnValueChanged(this);
}
}
public KnobControl()
{
// This call is required by the Windows.Forms Form Designer.
DottedPen = new Pen(Utility.getDarkColor(this.BackColor,40));
DottedPen.DashStyle = System.Drawing.Drawing2D.DashStyle.Dash;
DottedPen.DashCap = System.Drawing.Drawing2D.DashCap.Flat;
InitializeComponent();
setDimensions();
// TODO: Add any initialization after the InitForm call
}
protected override void OnPaint(PaintEventArgs e)
{
Graphics g = e.Graphics;
// Set background color of Image...
gOffScreen.Clear(this.BackColor);
// Fill knob Background to give knob effect....
gOffScreen.FillEllipse(bKnob,rKnob);
// Set antialias effect on
gOffScreen.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias ;
// Draw border of knob
gOffScreen.DrawEllipse(new Pen(this.BackColor),rKnob);
//if control is focused
if (this._isFocused)
{
gOffScreen.DrawEllipse(DottedPen,rKnob);
}
// get current position of pointer
Point Arrow = this.getKnobPosition();
// Draw pointer arrow that shows knob position
Utility.DrawInsetCircle(ref gOffScreen,new Rectangle(Arrow.X-3 ,Arrow.Y-3,6,6),new Pen(this.BackColor));
//---------------------------------------------
// darw small and large scale
//---------------------------------------------
if(this._ShowSmallScale)
{
for (int i= Minimum ; i<=Maximum ;i+= this._SmallChange)
{
gOffScreen.DrawLine(new Pen(this.ForeColor),getMarkerPoint(0,i),getMarkerPoint(3,i));
}
}
if(this._ShowLargeScale)
{
for (int i= Minimum ; i<=Maximum ;i+= this._LargeChange)
{
gOffScreen.DrawLine(new Pen(this.ForeColor),getMarkerPoint(0,i),getMarkerPoint(5,i));
}
}
// Drawimage on screen
g.DrawImage(OffScreenImage,0,0);
}
protected override void OnPaintBackground(PaintEventArgs e)
{
// Empty To avoid Flickring due do background Drawing.
}
protected override void OnMouseDown(MouseEventArgs e)
{
if (Utility.isPointinRectangle(new Point(e.X,e.Y),rKnob))
{
// Start Rotation of knob
this.isKnobRotating = true;
}
}
//----------------------------------------------------------
// we need to override IsInputKey method to allow user to
// use up, down, right and bottom keys other wise using this
// keys will change focus from current object to another
// object on the form
//----------------------------------------------------------
protected override bool IsInputKey(Keys key)
{
switch(key)
{
case Keys.Up:
case Keys.Down:
case Keys.Right:
case Keys.Left:
return true;
}
return base.IsInputKey(key);
}
protected override void OnMouseUp(MouseEventArgs e)
{
// Stop rotation
this.isKnobRotating = false;
if (Utility.isPointinRectangle(new Point(e.X,e.Y),rKnob))
{
// get value
this.Value = this.getValueFromPosition(new Point(e.X,e.Y));
}
this.Cursor = Cursors.Default;
}
protected override void OnMouseMove(MouseEventArgs e)
{
//--------------------------------------
// Following Handles Knob Rotating
//--------------------------------------
if (this.isKnobRotating == true)
{
this.Cursor = Cursors.Hand;
Point p = new Point(e.X, e.Y);
int posVal = this.getValueFromPosition(p);
Value = posVal;
}
}
protected override void OnEnter(EventArgs e)
{
this._isFocused = true;
this.Refresh();
base.OnEnter(new EventArgs());
}
protected override void OnLeave(EventArgs e)
{
this._isFocused = false;
this.Refresh();
base.OnLeave(new EventArgs());
}
/// <summary>
/// Clean up any resources being used.
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if(components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
#region Component Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.SuspendLayout();
//
// KnobControl
//
this.AutoScaleDimensions = new System.Drawing.SizeF(120F, 120F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Dpi;
this.AutoSize = true;
this.ImeMode = System.Windows.Forms.ImeMode.On;
this.Name = "KnobControl";
this.Load += new System.EventHandler(this.KnobControl_Load);
this.Resize += new System.EventHandler(this.KnobControl_Resize);
this.ResumeLayout(false);
}
#endregion
private void setDimensions()
{
// get smaller from height and width
int size = this.Width ;
if (this.Width > this.Height)
{
size = this.Height;
}
// allow 10% gap on all side to determine size of knob
this.rKnob = new Rectangle((int)(size*0.10),(int)(size*0.10),(int)(size*0.80),(int)(size*0.80));
this.rScale = new Rectangle(2,2,size-4,size-4);
this.pKnob = new Point(rKnob.X + rKnob.Width/2, rKnob.Y + rKnob.Height/2);
// create offscreen image
this.OffScreenImage = new Bitmap(this.Width,this.Height);
// create offscreen graphics
this.gOffScreen = Graphics.FromImage(OffScreenImage);
// create LinearGradientBrush for creating knob
bKnob = new System.Drawing.Drawing2D.LinearGradientBrush(
rKnob,Utility.getLightColor(this.BackColor,55),Utility.getDarkColor(this.BackColor,55),LinearGradientMode.ForwardDiagonal);
// create LinearGradientBrush for knobPoint
bKnobPoint = new System.Drawing.Drawing2D.LinearGradientBrush(
rKnob,Utility.getLightColor(this.BackColor,55),Utility.getDarkColor(this.BackColor,55),LinearGradientMode.ForwardDiagonal);
}
private void KnobControl_Resize(object sender, System.EventArgs e)
{
setDimensions();
Refresh();
}
/// <summary>
/// gets knob position that is to be drawn on control.
/// </summary>
/// <returns>Point that describes current knob position</returns>
private Point getKnobPosition()
{
double degree = 270* this.Value/(this.Maximum-this.Minimum);
degree = (degree +135)*Math.PI /180;
Point Pos = new Point(0,0);
Pos.X = (int)(Math.Cos(degree)*(rKnob.Width/2-10) + rKnob.X + rKnob.Width/2);
Pos.Y = (int)(Math.Sin(degree)*(rKnob.Width/2-10) + rKnob.Y + rKnob.Height/2);
return Pos;
}
/// <summary>
/// gets marker point required to draw scale marker.
/// </summary>
/// <param name="length">distance from center</param>
/// <param name="Value">value that is to be marked</param>
/// <returns>Point that describes marker position</returns>
private Point getMarkerPoint(int length,int Value)
{
double degree = 270* Value/(this.Maximum-this.Minimum);
degree = (degree +135)*Math.PI /180;
Point Pos = new Point(0,0);
Pos.X = (int)(Math.Cos(degree)*(rKnob.Width/2-length + 7) + rKnob.X + rKnob.Width/2);
Pos.Y = (int)(Math.Sin(degree)*(rKnob.Width/2-length + 7) + rKnob.Y + rKnob.Height/2);
return Pos;
}
/// <summary>
/// converts geomatrical position in to value..
/// </summary>
/// <param name="p">Point that is to be converted</param>
/// <returns>Value derived from position</returns>
private int getValueFromPosition(Point p)
{
double degree = 0.0;
int v = 0;
if (p.X <= pKnob.X )
{
degree = (double)(pKnob.Y - p.Y ) / (double)(pKnob.X - p.X );
degree = Math.Atan(degree);
degree = (degree) *(180/Math.PI) + 45;
v = (int)(degree * (this.Maximum-this.Minimum)/ 270);
}
else if (p.X > pKnob.X )
{
degree = (double)(p.Y - pKnob.Y ) / (double)(p.X - pKnob.X );
degree = Math.Atan(degree);
degree = 225 + (degree) *(180/Math.PI);
v = (int)(degree * (this.Maximum-this.Minimum)/ 270);
}
if (v > Maximum) v=Maximum;
if (v < Minimum) v=Minimum;
return v;
}
private void KnobControl_Load(object sender, EventArgs e)
{
}
}
}
我如何解决这个问题，请提供建议。
0 个答案:
没有答案
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