如何在System.Graphics中使用winforms全屏? c#

Question

我需要让winforms gdi+应用程序全屏显示。

我用这段代码绘制所有的界面元素。

e.Graphics.DrawImage(MatheMage.Properties.Resources.ChooseMenu, 0, 300);

我得到了类似于image1的东西

如果我使用这个代码

private void Form1_Load(object sender, EventArgs e)
{
    this.TopMost = true;
    this.FormBorderStyle = FormBorderStyle.None;
    this.WindowState = FormWindowState.Maximized;
}

我得到了类似于image2的东西

我需要所有的元素沿着窗户伸展。

Answer 1

在更改WindowState后，在表单加载方法中尝试执行此操作

this.BackgroundImageLayout = ImageLayout.Stretch;

Answer 2

由于您已经使用图形对象进行了绘制，因此只需使用ScaleTransform方法即可。

//save the current Transformation state of the graphics object.
var transState = e.Graphics.Save();

// Setting keepAspectRatio to false will scale your image to full screen.
// setting it to true will fill either the width or the height. you might need to use TranslateTransform method to move the image to the center.
bool keepAspectRatio = false;

// Calculate width and height ratios
// if you currently render everything to 640px/480px, you can take those dimensions instead of the Image size I used to calculate the ratios.
float widthRatio = this.DisplayRectangle.Width / MatheMage.Properties.Resources.ChooseMenu.Width;
float heightRatio = this.DisplayRectangle.Height / MatheMage.Properties.Resources.ChooseMenu.Height;

if(keepAspectratio)
{
    // If aspect ratio shall be kept: choose the smaller scale for both dimensions
    if(widthRatio > heightRatio)
    {
        widthRatio = heightRatio;
    }
    else
    {
        heightRatio = widthRatio;
    }
}

// Scale the graphics object.
e.Graphics.ScaleTransform(widthRatio, heightRatio);

// Draw your stuff as before.
e.Graphics.DrawImage(MatheMage.Properties.Resources.ChooseMenu, 0, 300);

//finally restor the old transformation state of the graphics object.
e.Graphics.Restore(transState);

希望这能让你振作起来。请注意，该代码未经过测试。