将动态标签写入图片框图像仅绘制最后修改的标签
Writing dynamic label to picturebox image only drawing the last modified label
好的,开始吧。我正在尝试将动态可编辑、可添加和可删除的文本添加到图片框上。我成功了。
从图片框保存图像时,不会保存标签。我现在可以使用 Graphics 将标签绘制为字符串。然而,它只将最后一个 modified/added/edited 标签绘制到 pictureBox。我迷路了。
这是我绘制标签并保存它们的代码:
if (sfd.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
string ext = Path.GetExtension(sfd.FileName);
switch (ext)
{
case ".jpg":
format = ImageFormat.Jpeg;
break;
case ".bmp":
format = ImageFormat.Bmp;
break;
}
Bitmap bmp = new Bitmap(pictureBox1.Image);
RectangleF rectf = new RectangleF(70, 90, 90, 50);
Graphics g = Graphics.FromImage(bmp);
g.SmoothingMode = SmoothingMode.AntiAlias;
g.InterpolationMode = InterpolationMode.HighQualityBicubic;
g.PixelOffsetMode = PixelOffsetMode.HighQuality;
g.Flush();
g.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias;
SolidBrush brush = new SolidBrush(label.ForeColor);
for (int i = 0; i < n; i++)
{
g.DrawString(label.Text, label.Font, brush, label.Location);
label.SelectNextControl(label, false, false, true, false);
}
pictureBox1.Image = bmp;
pictureBox1.Image.Save(sfd.FileName, format);
}
这里是定义和创建标签的地方:
label = new CustomLabel();
label.Name = "" + n;
label.Location = new Point(newTextbox.Location.X, newTextbox.Location.Y);
label.Text = newTextbox.Text;
label.Font = new Font("Verdana", fontSize);
label.BackColor = Color.Transparent;
label.ForeColor = textColor;
label.AutoSize = true;
label.Visible = true;
newTextbox.Visible = false;
newTextbox.Dispose();
pictureBox1.Controls.Add(label);
TextSelected = false;
label.DoubleClick += new System.EventHandler(this.label_DoubleClick);
label.MouseDown += new MouseEventHandler(this.label_MouseDown);
label.MouseUp += new MouseEventHandler(this.MouseUp);
label.MouseMove += new MouseEventHandler(this.MouseMove);
n++;
n 定义为:
public int n = 1;
文字添加笔画的地方:
public class CustomLabel : Label
{
public CustomLabel()
{
OutlineForeColor = Color.Black;
OutlineWidth = 3;
}
public Color OutlineForeColor { get; set; }
public float OutlineWidth { get; set; }
protected override void OnPaint(PaintEventArgs e)
{
e.Graphics.FillRectangle(new SolidBrush(BackColor), ClientRectangle);
using (GraphicsPath gp = new GraphicsPath())
using (Pen outline = new Pen(OutlineForeColor, OutlineWidth)
{ LineJoin = LineJoin.Round })
using (StringFormat sf = new StringFormat())
using (Brush foreBrush = new SolidBrush(ForeColor))
{
gp.AddString(Text, Font.FontFamily, (int)Font.Style,
Font.Size, ClientRectangle, sf);
e.Graphics.ScaleTransform(1.3f, 1.35f);
e.Graphics.SmoothingMode = SmoothingMode.HighQuality;
e.Graphics.DrawPath(outline, gp);
e.Graphics.FillPath(foreBrush, gp);
}
}
}
问题出在你的 for 循环中:
for (int i = 0; i < n; i++)
{
g.DrawString(label.Text, label.Font, brush, label.Location);
label.SelectNextControl(label, false, false, true, false);
}
这里 label
永远不会改变,所以你只是在绘制相同的标签 n
次。我不知道 SelectNextControl
是做什么的。
我建议循环访问图片框中的控件:
foreach (var customLabel in pictureBox1.Controls.OfType<CustomLabel>()) {
g.DrawString(customLabel.Text, customLabel.Font, brush, customLabel.Location);
}
好的,开始吧。我正在尝试将动态可编辑、可添加和可删除的文本添加到图片框上。我成功了。
从图片框保存图像时,不会保存标签。我现在可以使用 Graphics 将标签绘制为字符串。然而,它只将最后一个 modified/added/edited 标签绘制到 pictureBox。我迷路了。
这是我绘制标签并保存它们的代码:
if (sfd.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
string ext = Path.GetExtension(sfd.FileName);
switch (ext)
{
case ".jpg":
format = ImageFormat.Jpeg;
break;
case ".bmp":
format = ImageFormat.Bmp;
break;
}
Bitmap bmp = new Bitmap(pictureBox1.Image);
RectangleF rectf = new RectangleF(70, 90, 90, 50);
Graphics g = Graphics.FromImage(bmp);
g.SmoothingMode = SmoothingMode.AntiAlias;
g.InterpolationMode = InterpolationMode.HighQualityBicubic;
g.PixelOffsetMode = PixelOffsetMode.HighQuality;
g.Flush();
g.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias;
SolidBrush brush = new SolidBrush(label.ForeColor);
for (int i = 0; i < n; i++)
{
g.DrawString(label.Text, label.Font, brush, label.Location);
label.SelectNextControl(label, false, false, true, false);
}
pictureBox1.Image = bmp;
pictureBox1.Image.Save(sfd.FileName, format);
}
这里是定义和创建标签的地方:
label = new CustomLabel();
label.Name = "" + n;
label.Location = new Point(newTextbox.Location.X, newTextbox.Location.Y);
label.Text = newTextbox.Text;
label.Font = new Font("Verdana", fontSize);
label.BackColor = Color.Transparent;
label.ForeColor = textColor;
label.AutoSize = true;
label.Visible = true;
newTextbox.Visible = false;
newTextbox.Dispose();
pictureBox1.Controls.Add(label);
TextSelected = false;
label.DoubleClick += new System.EventHandler(this.label_DoubleClick);
label.MouseDown += new MouseEventHandler(this.label_MouseDown);
label.MouseUp += new MouseEventHandler(this.MouseUp);
label.MouseMove += new MouseEventHandler(this.MouseMove);
n++;
n 定义为:
public int n = 1;
文字添加笔画的地方:
public class CustomLabel : Label
{
public CustomLabel()
{
OutlineForeColor = Color.Black;
OutlineWidth = 3;
}
public Color OutlineForeColor { get; set; }
public float OutlineWidth { get; set; }
protected override void OnPaint(PaintEventArgs e)
{
e.Graphics.FillRectangle(new SolidBrush(BackColor), ClientRectangle);
using (GraphicsPath gp = new GraphicsPath())
using (Pen outline = new Pen(OutlineForeColor, OutlineWidth)
{ LineJoin = LineJoin.Round })
using (StringFormat sf = new StringFormat())
using (Brush foreBrush = new SolidBrush(ForeColor))
{
gp.AddString(Text, Font.FontFamily, (int)Font.Style,
Font.Size, ClientRectangle, sf);
e.Graphics.ScaleTransform(1.3f, 1.35f);
e.Graphics.SmoothingMode = SmoothingMode.HighQuality;
e.Graphics.DrawPath(outline, gp);
e.Graphics.FillPath(foreBrush, gp);
}
}
}
问题出在你的 for 循环中:
for (int i = 0; i < n; i++)
{
g.DrawString(label.Text, label.Font, brush, label.Location);
label.SelectNextControl(label, false, false, true, false);
}
这里 label
永远不会改变,所以你只是在绘制相同的标签 n
次。我不知道 SelectNextControl
是做什么的。
我建议循环访问图片框中的控件:
foreach (var customLabel in pictureBox1.Controls.OfType<CustomLabel>()) {
g.DrawString(customLabel.Text, customLabel.Font, brush, customLabel.Location);
}