private void panel1_Paint(object sender, PaintEventArgs e)
{
Rectangle r1 = new Rectangle(0, 0, 100, 40);
Rectangle r2 = new Rectangle(14, 194, 100, 40);
e.Graphics.DrawImage(pic, r1, r2, GraphicsUnit.Pixel);
}
#region 图片旋转函数
/// <summary>
/// 以逆时针为方向对图像进行旋转
/// </summary>
/// <param name="b">位图流</param>
/// <param name="angle">旋转角度[0,360](前台给的)</param>
/// <returns></returns>
public Bitmap Rotate(Bitmap b, int angle)
{
angle = angle % 360;
//弧度转换
double radian = angle * Math.PI / 180.0;
double cos = Math.Cos(radian);
double sin = Math.Sin(radian);
//原图的宽和高
int w = b.Width;
int h = b.Height;
int W = (int)(Math.Max(Math.Abs(w * cos - h * sin), Math.Abs(w * cos + h * sin)));
int H = (int)(Math.Max(Math.Abs(w * sin - h * cos), Math.Abs(w * sin + h * cos)));
//目标位图
Bitmap dsImage = new Bitmap(W, H);
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(dsImage);
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.Bilinear;
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
//计算偏移量
Point Offset = new Point((W - w) / 2, (H - h) / 2);
//构造图像显示区域：让图像的中心与窗口的中心点一致
Rectangle rect = new Rectangle(Offset.X, Offset.Y, w, h);
Point center = new Point(rect.X + rect.Width / 2, rect.Y + rect.Height / 2);
g.TranslateTransform(center.X, center.Y);
g.RotateTransform(360 - angle);
//恢复图像在水平和垂直方向的平移
g.TranslateTransform(-center.X, -center.Y);
g.DrawImage(b, rect);
//重至绘图的所有变换
g.ResetTransform();
g.Save();
g.Dispose();
//dsImage.Save("yuancd.jpg", System.Drawing.Imaging.ImageFormat.Jpeg);
return dsImage;
}
#endregion 图片旋转函数
<?php
/**
* This class can be used to get the most common colors in an image.
* It needs one parameter:
* $image - the filename of the image you want to process.
* Optional parameters:
*
* $count - how many colors should be returned. 0 mmeans all. default=20
* $reduce_brightness - reduce (not eliminate) brightness variants? default=true
* $reduce_gradients - reduce (not eliminate) gradient variants? default=true
* $delta - the amount of gap when quantizing color values.
* Lower values mean more accurate colors. default=16
*
* Author: Csongor Zalatnai
*
* Modified By: Kepler Gelotte - Added the gradient and brightness variation
* reduction routines. Kudos to Csongor for an excellent class. The original
* version can be found at:
*
* http://www.phpclasses.org/browse/package/3370.html
*
*/
class GetMostCommonColors
{
var $PREVIEW_WIDTH = 150;
var $PREVIEW_HEIGHT = 150; var $error; /**
* Returns the colors of the image in an array, ordered in descending order, where the keys are the colors, and the values are the count of the color.
*
* @return array
*/
function Get_Color( $img, $count=20, $reduce_brightness=true, $reduce_gradients=true, $delta=16 )
{
if (is_readable( $img ))
{
if ( $delta > 2 )
{
$half_delta = $delta / 2 - 1;
}
else
{
$half_delta = 0;
}
// WE HAVE TO RESIZE THE IMAGE, BECAUSE WE ONLY NEED THE MOST SIGNIFICANT COLORS.
$size = GetImageSize($img);
$scale = 1;
if ($size[0]>0)
$scale = min($this->PREVIEW_WIDTH/$size[0], $this->PREVIEW_HEIGHT/$size[1]);
if ($scale < 1)
{
$width = floor($scale*$size[0]);
$height = floor($scale*$size[1]);
}
else
{
$width = $size[0];
$height = $size[1];
}
$image_resized = imagecreatetruecolor($width, $height);
if ($size[2] == 1)
$image_orig = imagecreatefromgif($img);
if ($size[2] == 2)
$image_orig = imagecreatefromjpeg($img);
if ($size[2] == 3)
$image_orig = imagecreatefrompng($img);
// WE NEED NEAREST NEIGHBOR RESIZING, BECAUSE IT DOESN'T ALTER THE COLORS
imagecopyresampled($image_resized, $image_orig, 0, 0, 0, 0, $width, $height, $size[0], $size[1]);
$im = $image_resized;
$imgWidth = imagesx($im);
$imgHeight = imagesy($im);
$total_pixel_count = 0;
for ($y=0; $y < $imgHeight; $y++)
{
for ($x=0; $x < $imgWidth; $x++)
{
$total_pixel_count++;
$index = imagecolorat($im,$x,$y);
$colors = imagecolorsforindex($im,$index);
// ROUND THE COLORS, TO REDUCE THE NUMBER OF DUPLICATE COLORS
if ( $delta > 1 )
{
$colors['red'] = intval((($colors['red'])+$half_delta)/$delta)*$delta;
$colors['green'] = intval((($colors['green'])+$half_delta)/$delta)*$delta;
$colors['blue'] = intval((($colors['blue'])+$half_delta)/$delta)*$delta;
if ($colors['red'] >= 256)
{
$colors['red'] = 255;
}
if ($colors['green'] >= 256)
{
$colors['green'] = 255;
}
if ($colors['blue'] >= 256)
{
$colors['blue'] = 255;
} } $hex = substr("0".dechex($colors['red']),-2).substr("0".dechex($colors['green']),-2).substr("0".dechex($colors['blue']),-2); if ( ! isset( $hexarray[$hex] ) )
{
$hexarray[$hex] = 1;
}
else
{
$hexarray[$hex]++;
}
}
} // Reduce gradient colors
if ( $reduce_gradients )
{
// if you want to *eliminate* gradient variations use:
// ksort( &$hexarray );
arsort( &$hexarray, SORT_NUMERIC ); $gradients = array();
foreach ($hexarray as $hex => $num)
{
if ( ! isset($gradients[$hex]) )
{
$new_hex = $this->_find_adjacent( $hex, $gradients, $delta );
$gradients[$hex] = $new_hex;
}
else
{
$new_hex = $gradients[$hex];
} if ($hex != $new_hex)
{
$hexarray[$hex] = 0;
$hexarray[$new_hex] += $num;
}
}
} // Reduce brightness variations
if ( $reduce_brightness )
{
// if you want to *eliminate* brightness variations use:
// ksort( &$hexarray );
arsort( &$hexarray, SORT_NUMERIC ); $brightness = array();
foreach ($hexarray as $hex => $num)
{
if ( ! isset($brightness[$hex]) )
{
$new_hex = $this->_normalize( $hex, $brightness, $delta );
$brightness[$hex] = $new_hex;
}
else
{
$new_hex = $brightness[$hex];
} if ($hex != $new_hex)
{
$hexarray[$hex] = 0;
$hexarray[$new_hex] += $num;
}
}
} arsort( &$hexarray, SORT_NUMERIC ); // convert counts to percentages
foreach ($hexarray as $key => $value)
{
$hexarray[$key] = (float)$value / $total_pixel_count;
} if ( $count > 0 )
{
// only works in PHP5
// return array_slice( $hexarray, 0, $count, true ); $arr = array();
foreach ($hexarray as $key => $value)
{
if ($count == 0)
{
break;
}
$count--;
$arr[$key] = $value;
}
return $arr;
}
else
{
return $hexarray;
} }
else
{
$this->error = "Image ".$img." does not exist or is unreadable";
return false;
}
} function _normalize( $hex, $hexarray, $delta )
{
$lowest = 255;
$highest = 0;
$colors['red'] = hexdec( substr( $hex, 0, 2 ) );
$colors['green'] = hexdec( substr( $hex, 2, 2 ) );
$colors['blue'] = hexdec( substr( $hex, 4, 2 ) ); if ($colors['red'] < $lowest)
{
$lowest = $colors['red'];
}
if ($colors['green'] < $lowest )
{
$lowest = $colors['green'];
}
if ($colors['blue'] < $lowest )
{
$lowest = $colors['blue'];
} if ($colors['red'] > $highest)
{
$highest = $colors['red'];
}
if ($colors['green'] > $highest )
{
$highest = $colors['green'];
}
if ($colors['blue'] > $highest )
{
$highest = $colors['blue'];
} // Do not normalize white, black, or shades of grey unless low delta
if ( $lowest == $highest )
{
if ($delta <= 32)
{
if ( $lowest == 0 || $highest >= (255 - $delta) )
{
return $hex;
}
}
else
{
return $hex;
}
} for (; $highest < 256; $lowest += $delta, $highest += $delta)
{
$new_hex = substr("0".dechex($colors['red'] - $lowest),-2).substr("0".dechex($colors['green'] - $lowest),-2).substr("0".dechex($colors['blue'] - $lowest),-2); if ( isset( $hexarray[$new_hex] ) )
{
// same color, different brightness - use it instead
return $new_hex;
}
} return $hex;
} function _find_adjacent( $hex, $gradients, $delta )
{
$red = hexdec( substr( $hex, 0, 2 ) );
$green = hexdec( substr( $hex, 2, 2 ) );
$blue = hexdec( substr( $hex, 4, 2 ) ); if ($red > $delta)
{
$new_hex = substr("0".dechex($red - $delta),-2).substr("0".dechex($green),-2).substr("0".dechex($blue),-2);
if ( isset($gradients[$new_hex]) )
{
return $gradients[$new_hex];
}
}
if ($green > $delta)
{
$new_hex = substr("0".dechex($red),-2).substr("0".dechex($green - $delta),-2).substr("0".dechex($blue),-2);
if ( isset($gradients[$new_hex]) )
{
return $gradients[$new_hex];
}
}
if ($blue > $delta)
{
$new_hex = substr("0".dechex($red),-2).substr("0".dechex($green),-2).substr("0".dechex($blue - $delta),-2);
if ( isset($gradients[$new_hex]) )
{
return $gradients[$new_hex];
}
} if ($red < (255 - $delta))
{
$new_hex = substr("0".dechex($red + $delta),-2).substr("0".dechex($green),-2).substr("0".dechex($blue),-2);
if ( isset($gradients[$new_hex]) )
{
return $gradients[$new_hex];
}
}
if ($green < (255 - $delta))
{
$new_hex = substr("0".dechex($red),-2).substr("0".dechex($green + $delta),-2).substr("0".dechex($blue),-2);
if ( isset($gradients[$new_hex]) )
{
return $gradients[$new_hex];
}
}
if ($blue < (255 - $delta))
{
$new_hex = substr("0".dechex($red),-2).substr("0".dechex($green),-2).substr("0".dechex($blue + $delta),-2);
if ( isset($gradients[$new_hex]) )
{
return $gradients[$new_hex];
}
} return $hex;
}
}
?>