随着一年一度的国庆假期越来越近,身边的国庆氛围也越来越重,很多人也开始换上了渐变国旗头像,提前为祖国母亲庆生。那每年都很火的渐变国旗头像要如何制作呢?其实一点也不难!接下来就分享一种渐变国旗头像
生成方法。
上传原始微信或其他头像,将头像的Image
对象用Graphics
创建返回GDI+
对象,然后用GDI+
对象在原始头像指定位置进行追加绘制指定大小的图像渲染显示。
演示项目为Winform窗体应用程序,项目具体信息如下:
.NET Framework 4.8
/// <summary>
/// 选择头像
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btn_select_Click(object sender, EventArgs e)
{
OpenFileDialog openFileDialog = new OpenFileDialog();
openFileDialog.InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);//初始路径为桌面
openFileDialog.Filter = "头像图片|*.png;*.jpg";
if (openFileDialog.ShowDialog() == DialogResult.OK)
{
pic_old.Image = Image.FromFile(openFileDialog.FileName);
}
}
/// <summary>
/// 生成或切换模板事件
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btn_change_Click(object sender, EventArgs e)
{
GenerateOrChangeTemplate();
}
/// <summary>
/// 生成头像或切换模板生成头像
/// </summary>
private void GenerateOrChangeTemplate()
{
try
{
if (templateFileInfos.Length == 0)
{
MessageBox.Show("红旗模板集为空,请添加", "提示", MessageBoxButtons.OK);
return;
}
if (index >= templateFileInfos.Length)
{
index = 0;
}
Image head = (Image)pic_old.Image.Clone();
Image template = Image.FromFile(templateFileInfos[index].FullName);
Graphics graphics = Graphics.FromImage(head);
if (templateFileInfos[index].Name.StartsWith("all_"))
{
graphics.DrawImage(template, 0, 0, head.Width, head.Height);
}
else if (templateFileInfos[index].Name.StartsWith("right_"))
{
int x = head.Width / 4 * 3;
int y = head.Height / 4 * 3;
int w = head.Width / 4;
int h = head.Height / 4;
graphics.DrawImage(template, x, y, w, h);
}
else if (templateFileInfos[index].Name.StartsWith("left_"))
{
int y = head.Height - template.Height;
if (y < 0) y = 0;
graphics.DrawImage(template, 0, y, head.Width, head.Height);
}
pic_new.Image = head;
index++;
}
catch (Exception ex)
{
MessageBox.Show("出错了:"+ ex.Message,"警号",MessageBoxButtons.OK);
}
}
/// <summary>
/// 保存重新绘制的图片
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btn_save_Click(object sender, EventArgs e)
{
SaveFileDialog saveFileDialog = new SaveFileDialog();
saveFileDialog.Filter = "图片文件|*.png";
if (saveFileDialog.ShowDialog() == DialogResult.OK)
{
pic_new.Image.Save(saveFileDialog.FileName, ImageFormat.Png);
MessageBox.Show("保存成功");
}
}
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