WinFrom程序如何从数据库循环读取图片并合成
数据库中有表backgroundimage（背景图片表），backgroundpoint（图片坐标表），systemheadimage（头像表），分别存放的背景，坐标及头像，我现在要对应遍历出三表相关信息并合成一张图片，合成方法我已经做好，如下代码：
C# code
原文转自：http://club.itqun.net/showtopic-257319.html
using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
using System.Drawing.Drawing2D;
namespace BaiShun
{
publicclass Helper
{
#region Helper
///<summary>
/// 原图的大小
///</summary>
publicint calcWidth(int h, Image image)
{
int w =0;
//计算比例
//w/h = nw/x x*w = h*nw; x = h*nw/w
w =Convert.ToInt32( image.Width * h / image.Height);
return w;
}
///<summary>
/// 计算两点间长度
///</summary>
publicint getLength(int x1, int y1, int x2, int y2)
{
double distance = Math.Pow(Math.Pow((x1 - x2), 2) + Math.Pow((y1 - y2), 2), 0.5);
return Convert.ToInt32( distance);
}
///<summary>
/// 计算角度
///</summary>
///<param name="px1">p1 X轴</param>
///<param name="py1">p1 y轴</param>
///<param name="px2">p2 X轴</param>
///<param name="py2">p2 y轴</param>
///<returns></returns>
publicdouble getAngle(double px1, double py1, double px2, double py2)
{
double x = px2 - px1;
double y = py2 - py1;
double hyp = Math.Sqrt(Math.Pow(x, 2) + Math.Pow(y, 2));
double cos = x / hyp;
double rad = Math.Acos(cos);
double deg =180/ (Math.PI / rad);
if (y <0) { deg =-deg; }
elseif ((y ==0) && (x <0)) { deg =180; }
return deg;
}
///<summary>
/// 计算角度
///</summary>
public Image RotateImg(Image 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);
Graphics g = Graphics.FromImage(dsImage);
/*坐标结束*/
g.InterpolationMode = InterpolationMode.Default;//Bilinear;
g.SmoothingMode = SmoothingMode.Default;// 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();
b.Dispose();
return dsImage;
}
///<summary>
/// 厘米转像素 根据drawGraphicsDPI—X轴
///</summary>
publicint cm_To_px_ByX(int length)
{
return Convert.ToInt32(length *72/2.54);
}
///<summary>
/// 厘米转像素 根据drawGraphicsDPI—Y轴
///</summary>
publicint cm_To_px_ByY(int width)
{
return Convert.ToInt32(width *72/2.54);
}
///<summary>
/// 像素转厘米 根据drawGraphicsDPI—X轴
///</summary>
publicfloat px_To_cm_ByX(int length)
{
return Convert.ToSingle(length *2.54/72);
}
///<summary>
/// 像素转厘米 根据drawGraphicsDPI—Y轴
///</summary>
publicint px_To_cm_ByY(int width)
{
return Convert.ToInt32(width *2.54/72);
}
#endregion Helper
}
}
using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
namespace BaiShun
{
publicclass SyntheticHelper
{
privatestatic Helper helper =new Helper();
///<summary>
/// 设置图片
///</summary>
publicstatic Image settingPic(Image originalBackgroundImage, Image originalHeadImage, int p1_X, int p1_Y, int p2_X, int p2_Y)
{
///************************绘制背景************************/
//1. 新建backgroundImage。
Image backgroundImage =new Bitmap(originalBackgroundImage.Width, originalBackgroundImage.Height);
//2. drawBackgroundImagePoint定义backgroundImage背景坐标系
Point[] drawBackgroundImagePoint =new Point[] { new Point(0, 0), new Point(originalBackgroundImage.Width, 0), new Point(0, originalBackgroundImage.Height) };
// 获得图面
Graphics drawGraphicsBackground = Graphics.FromImage(backgroundImage);
//3. 将originalBackgroundImage原始背景图绘制上去（backgroundImage）
drawGraphicsBackground.DrawImage(originalBackgroundImage, drawBackgroundImagePoint);
drawGraphicsBackground.Dispose();
//backgroundImage
//***********************头像***********************
int tempY = p2_Y - p1_Y;
int tempX = p2_X - p1_X;
double radian = Math.Atan2((double)(tempY), (double)(tempX));
int angle1 = Convert.ToInt32(radian * (180/ Math.PI));
radian = angle1 * (Math.PI /180);
double t1 = Math.Cos(radian);
double t2 = Math.Sin(radian);
double t3 = Math.Cos(-radian);
double t4 = Math.Sin(-radian);
/*追加的素材图片*/
// *1. 根据p1,p2点计算两点间的距离。可以得出缩放图片的高度h
int h = helper.getLength(p1_X, p1_Y, p2_X, p2_Y);
// *2. 根据h计算出w
int w = helper.calcWidth(h, originalHeadImage);
//1. 计算缩放长宽，使用originalHeadImage创建zoomImage图片。（图片已被缩放）
Bitmap zoomImage =new Bitmap(originalHeadImage, w, h);
//2. 根据坐标p1,p2点计算角度angle（公式A）
double angle =Math.Abs( helper.getAngle(p1_X, p1_Y, p2_X, p2_Y));
// double radian = angle * (Math.PI / 180);
//3. 根据zoomImage计算旋转图形生成rotateImage
Image rotateImage = helper.RotateImg(zoomImage, Convert.ToInt32(-90+ Math.Abs(angle)));
//4. 将angle绝对值修正成正坐标。
//angle = angle);
//5. 取得backgroundImage背景绘画方法。准备绘图
Graphics drawGraphics = Graphics.FromImage(backgroundImage);
//6. 计算修正坐标[Revised_X]和[Revised_Y]。
int Revised_X = Convert.ToInt32(Math.Cos(90- angle) * (w /2));
int Revised_Y = Convert.ToInt32(Math.Sin(90- angle) * (w /2));
//7. 声明p3点
int p3_X =0;
int p3_Y =0;
//8. 判断
if (p1_X == p2_X || p1_Y == p2_Y)
{
//如果是垂直形[坐标位置直接减去rotateImage宽度的一半]。
p3_X = Convert.ToInt32(p2_X - Math.Abs(Revised_X));
p3_Y = Convert.ToInt32(p2_Y + Math.Abs(Revised_Y));
//垂直型
// 9.绘制图形输出
drawGraphics.DrawImage(rotateImage, new Point(p3_X, p3_Y));
}
else
{
// drawGraphics.TranslateTransform(0, 140);// 平移到5，5坐标
double temp = Math.Sin(radian);
temp /=2;
double temp2 = Math.Cos(radian);
p3_X = Convert.ToInt32((float)p1_X + (float)w * temp );
p3_Y = Convert.ToInt32((float)p1_Y + (float)h * Math.Sin(radian) - w * temp2 /2);
//其它型
// 9.绘制图形输出
drawGraphics.DrawImage(rotateImage, new Point(p3_X, p3_Y));
}
drawGraphics.Dispose();
return backgroundImage;
}
///<summary>
/// 设置文字
///</summary>
publicstatic Image settingFont(Image image, String Text, int x, int y)
{
//获得画笔
Graphics drawGraphicsFont = Graphics.FromImage(image);
Brush brush =new System.Drawing.SolidBrush(System.Drawing.Color.Black);
//绘制文字
drawGraphicsFont.DrawString(Text, new Font("宋体", 15), brush, x, y);
drawGraphicsFont.Dispose();
return image;
}
}
}
