aspmysql做网站,温州专业建站,微信官方网站是什么,桔子seo文章目录 前三篇回顾GraphicsPath方法Flatten压平(将曲线转成线段)GetBounds获取外接矩形GetLastPoint获取路径最后一个点IsOutlineVisibleIsVisiable是否在轮廓上或内部Reset重置Reverse逆转点的顺序Transform矩阵变换Wrap扭曲变换Widen将路径替换为指定画笔的填充区域 前三篇… 文章目录 前三篇回顾GraphicsPath方法Flatten压平(将曲线转成线段)GetBounds获取外接矩形GetLastPoint获取路径最后一个点IsOutlineVisibleIsVisiable是否在轮廓上或内部Reset重置Reverse逆转点的顺序Transform矩阵变换Wrap扭曲变换Widen将路径替换为指定画笔的填充区域 前三篇回顾
【学习笔记】Windows GDI绘图(五)图形路径GraphicsPath详解(上)
图形路径GraphicsPath 填充模式FillMode构造函数 GraphicsPath() GraphicsPath(FillMode) GraphicsPath(Point[],Byte[])和GraphicsPath(PointF[], Byte[]) GraphicsPath(Point[], Byte[], FillMode)和GraphicsPath(PointF[], Byte[], FillMode) PathPointType属性 FillMode PathData PathPoints、PathTypes PointCount方法 AddArc添加椭圆弧 AddBezier添加贝赛尔曲线 AddClosedCurve添加封闭基数样条曲线 AddCurve添加基数样条曲线(开放) AddEllipse添加椭圆 AddLine添加线段
【学习笔记】Windows GDI绘图(六)图形路径GraphicsPath详解(中)
AddLines添加线段AddPath附加路径AddPie添加饼形AddPolygon添加多边形AddRectangle和AddRectangles 添加矩形AddString添加字符串SetMarkers设置标记ClearMarkers清空标记StartFigure开始新的图形CloseAllFigures闭合所有图形、CloseFigure闭合当前图形
Window GDI API有BUG?GetBounds测不准
详细说明GetBounds方法 全文图像
GraphicsPath方法
Flatten压平(将曲线转成线段)
原型
public void Flatten ();
public void Flatten (System.Drawing.Drawing2D.Matrix? matrix);//默认flatness0.25
public void Flatten (System.Drawing.Drawing2D.Matrix? matrix, float flatness);参数说明martix变换矩阵flatness曲线转线段的最大误差默认值是0.25。值越小越接近曲线线段数量越多。
将此路径中的每条曲线转换为一系列连接的线段。
GraphicsPath myPath new GraphicsPath();
Matrix translateMatrix new Matrix();
translateMatrix.Translate(0, 0);
Point point1 new Point(20, 200);
Point point2 new Point(100, 30);
Point point3 new Point(230, 300);
Point point4 new Point(380, 150);
Point[] points { point1, point2, point3, point4 };
myPath.AddCurve(points);e.Graphics.DrawPath(new Pen(Color.LightGreen, 5), myPath);
myPath.Flatten(translateMatrix, 25f);
e.Graphics.DrawPath(new Pen(Color.Black, 1), myPath);//原曲线控制点
foreach (var pt in points)
{e.Graphics.FillEllipse(Brushes.Red, pt.X - 5, pt.Y - 5, 10, 10);
}//Flatten后的点
foreach( var pt in myPath.PathPoints )
{e.Graphics.FillEllipse(Brushes.Black, pt.X - 3, pt.Y - 3, 6, 6);
}GetBounds获取外接矩形
原型
public System.Drawing.RectangleF GetBounds ();
public System.Drawing.RectangleF GetBounds (System.Drawing.Drawing2D.Matrix? matrix);
public System.Drawing.RectangleF GetBounds (System.Drawing.Drawing2D.Matrix? matrix, System.Drawing.Pen? pen);获取路径的外接矩形关于使用pen参数后获取结果貌似“松弛”问题可查阅Window GDI API有BUG?GetBounds测不准
var rect new Rectangle(200, 200, 300, 200);using(var pathnew GraphicsPath())
{path.AddEllipse(rect);//用于确定椭圆的矩形e.Graphics.DrawRectangle(new Pen(Color.LightGreen,10),rect);var pathPen new Pen(Color.Green, 50);pathPen.MiterLimit 1;var bboxWithPen path.GetBounds(new Matrix(), pathPen);//含pen参数的外接矩形e.Graphics.DrawRectangle(Pens.Black,bboxWithPen.X pathPen.Width / 2, bboxWithPen.Y pathPen.Width / 2, bboxWithPen.Width - pathPen.Width, bboxWithPen.Height - pathPen.Width);//绘制椭圆e.Graphics.DrawPath(pathPen, path);var bboxWitoutPen path.GetBounds();//不含pen参数的外接矩形e.Graphics.DrawRectangles(new Pen(Color.Red, 3), new RectangleF[] { bboxWitoutPen });
}定义一个矩形根据这个矩形绘制一个椭圆其中pen的宽度为50获取含pen与不含pen时其外接矩形的大小。
GetLastPoint获取路径最后一个点
原型
public System.Drawing.PointF GetLastPoint ();作用获取GraphicsPath中路径的最后一个点。
var pt1 new Point(200, 200);
var pt2 new Point(300, 300);using (var path new GraphicsPath())
{path.AddLine(pt1,pt2);//绘制路径e.Graphics.DrawPath(new Pen(Color.Red, 10), path);//获取路径最后一个点的坐var lastPointpath.GetLastPoint();int offset 20;//显示最后一点的坐标DrawString(e, $LastPoint:({lastPoint.X},{lastPoint.Y}), ref offset);
}
定义两个点按线段方式添加到图形路径中再通过GetLastPoint()获取其最后一个点的坐标。 IsOutlineVisible
原型
public bool IsOutlineVisible (int x, int y, System.Drawing.Pen pen, System.Drawing.Graphics? graphics);
public bool IsOutlineVisible (System.Drawing.Point pt, System.Drawing.Pen pen, System.Drawing.Graphics? graphics);
public bool IsOutlineVisible (float x, float y, System.Drawing.Pen pen, System.Drawing.Graphics? graphics);
public bool IsOutlineVisible (float x, float y, System.Drawing.Pen pen);
public bool IsOutlineVisible (System.Drawing.PointF point, System.Drawing.Pen pen);
public bool IsOutlineVisible (System.Drawing.PointF pt, System.Drawing.Pen pen, System.Drawing.Graphics? graphics);
public bool IsOutlineVisible (int x, int y, System.Drawing.Pen pen);
public bool IsOutlineVisible (System.Drawing.Point point, System.Drawing.Pen pen);作用使用指定的Pen绘制时指定的点是否包含在此GraphicsPath的轮廓内。 要判断的点在边缘处时不同的笔宽返回值略有不同使用时需注意。
[System.ComponentModel.Description(GraphicsPath的IsOutlineVisiable方法)]
public void Demo07_04(PaintEventArgs e)
{var rect new Rectangle(300, 200, 300, 200);using (var path new GraphicsPath(FillMode.Winding)){path.AddRectangle(rect);var penWidth 1f;var halfPenWidth penWidth / 2f;var pathPen new Pen(Color.Red, penWidth);//绘制路径e.Graphics.DrawPath(pathPen, path);int offset 10;DrawString(e,$Rect:({rect.X},{rect.Y},{rect.Width},{rect.Height}) penWidth:{pathPen.Width},ref offset);var y (rect.Top rect.Bottom) / 2.0f;var pt new PointF(rect.X - halfPenWidth - 1f, y);DrawString(e, $({pt.X},{pt.Y}) IsOutlineVisiable:{path.IsOutlineVisible(pt, pathPen)}), ref offset);DrawCross(e, pt, Color.Black);pt new PointF(rect.X - halfPenWidth-0.5f, y);DrawString(e, $({pt.X},{pt.Y}) IsOutlineVisiable:{path.IsOutlineVisible(pt, pathPen)}), ref offset);DrawCross(e, pt, Color.Black);pt new PointF(rect.X halfPenWidth - 1f, y);DrawString(e, $({pt.X},{pt.Y}) IsOutlineVisiable:{path.IsOutlineVisible(pt, pathPen)}), ref offset);DrawCross(e, pt, Color.Black);pt new PointF(rect.X halfPenWidth - 0.5f, y);DrawString(e, $({pt.X},{pt.Y}) IsOutlineVisiable:{path.IsOutlineVisible(pt, pathPen)}), ref offset);DrawCross(e, pt, Color.Black);pt new Point(450, 300);// 在轮廓包围的里面也不算在轮廓上DrawString(e, $({pt.X},{pt.Y}) IsOutlineVisiable:{path.IsOutlineVisible(pt, pathPen)}), ref offset);DrawCross(e, pt, Color.Black);}
}/// summary
/// 给定中心点画十字架
/// /summary
/// param namee/param
/// param namecenter/param
/// param namecolor/param
/// param namelen/param
/// param namepenWidth/param
private void DrawCross(PaintEventArgs e,PointF center,Color color, int len40, float penWidth1f)
{var half len / 2.0f;using (var pen new Pen(color, penWidth)){e.Graphics.DrawLine(pen, center.X, center.Y - half, center.X, center.Y half);e.Graphics.DrawLine(pen, center.X-half, center.Y, center.Xhalf, center.Y );}
}
笔宽为1时 笔宽为10时
IsVisiable是否在轮廓上或内部
原型
public bool IsVisible (System.Drawing.Point point);
public bool IsVisible (System.Drawing.PointF point);
public bool IsVisible (System.Drawing.Point pt, System.Drawing.Graphics? graphics);
public bool IsVisible (System.Drawing.PointF pt, System.Drawing.Graphics? graphics);
public bool IsVisible (int x, int y);
public bool IsVisible (float x, float y);
public bool IsVisible (int x, int y, System.Drawing.Graphics? graphics);
public bool IsVisible (float x, float y, System.Drawing.Graphics? graphics);作用判断一个点是否在轮廓上或内部与IsOutlineVisiable的差别时IsOutlineVisable只判断是在轮廓上)如果路径是未封闭图形会自动封闭 [System.ComponentModel.Description(GraphicsPath的IsVisiable方法)]public void Demo07_05(PaintEventArgs e){var rect new Rectangle(300, 200, 300, 200);using (var path new GraphicsPath(FillMode.Winding)){path.AddRectangle(rect);var penWidth 10f;var halfPenWidth penWidth / 2f;var pathPen new Pen(Color.Red, penWidth);//绘制路径e.Graphics.DrawPath(pathPen, path);int offset 10;DrawString(e, $Rect:({rect.X},{rect.Y},{rect.Width},{rect.Height}) penWidth:{pathPen.Width}, ref offset);var y (rect.Top rect.Bottom) / 2.0f;var pt new PointF(rect.X - halfPenWidth - 1f, y);DrawString(e, $({pt.X},{pt.Y}) IsVisible:{path.IsVisible(pt)}), ref offset);DrawCross(e, pt, Color.Black);pt new PointF(rect.X - halfPenWidth - 0.5f, y);DrawString(e, $({pt.X},{pt.Y}) IsVisible:{path.IsVisible(pt)}), ref offset);DrawCross(e, pt, Color.Black);pt new PointF(rect.X halfPenWidth - 1f, y);DrawString(e, $({pt.X},{pt.Y}) IsVisible:{path.IsVisible(pt)}), ref offset);DrawCross(e, pt, Color.Black);pt new PointF(rect.X halfPenWidth - 0.5f, y);DrawString(e, $({pt.X},{pt.Y}) IsVisible:{path.IsVisible(pt)}), ref offset);DrawCross(e, pt, Color.Black);pt new Point(450, 300);// 在轮廓包围的里面也不算在轮廓上DrawString(e, $({pt.X},{pt.Y}) IsVisible:{path.IsVisible(pt)}), ref offset);DrawCross(e, pt, Color.Black);}}[System.ComponentModel.Description(GraphicsPath的IsVisiable方法)]public void Demo07_06(PaintEventArgs e){var rect new Rectangle(300, 200, 300, 200);var pts new Point[]{new Point(300,400),new Point(400,150),new Point(500,420)};using (var path new GraphicsPath(FillMode.Winding)){path.AddCurve(pts);var penWidth 10f;var halfPenWidth penWidth / 2f;var pathPen new Pen(Color.Red, penWidth);//绘制路径e.Graphics.DrawPath(pathPen, path);int offset 10;DrawString(e, $Rect:({rect.X},{rect.Y},{rect.Width},{rect.Height}) penWidth:{pathPen.Width}, ref offset);var y (rect.Top rect.Bottom) / 2.0f;var pt new PointF(rect.X - halfPenWidth - 1f, y);DrawString(e, $({pt.X},{pt.Y}) IsVisible:{path.IsVisible(pt)}), ref offset);DrawCross(e, pt, Color.Black);pt new PointF(rect.X - halfPenWidth - 0.5f, y);DrawString(e, $({pt.X},{pt.Y}) IsVisible:{path.IsVisible(pt)}), ref offset);DrawCross(e, pt, Color.Black);pt new PointF(rect.X halfPenWidth - 1f, y);DrawString(e, $({pt.X},{pt.Y}) IsVisible:{path.IsVisible(pt)}), ref offset);DrawCross(e, pt, Color.Black);pt new PointF(rect.X halfPenWidth - 0.5f, y);DrawString(e, $({pt.X},{pt.Y}) IsVisible:{path.IsVisible(pt)}), ref offset);DrawCross(e, pt, Color.Black);pt new Point(450, 300);// 在轮廓包围的里面也不算在轮廓上DrawString(e, $({pt.X},{pt.Y}) IsVisible:{path.IsVisible(pt)}), ref offset);DrawCross(e, pt, Color.Black);}}创建一个矩形和一个开放的曲线判断点。 Reset重置
原型
public void Reset ();作用清空路径并将FillMode置为Alternate。
Reverse逆转点的顺序
原型
public void Reverse ();作用逆转GraphicsPath中PathPoints的点的顺序。
var rect new Rectangle(200, 200, 400, 250);
var pts new Point[]
{new Point(300,400),new Point(400,150),new Point(500,420)
};using (var path new GraphicsPath(FillMode.Winding))
{path.AddRectangle(rect);path.AddCurve(pts);var penWidth 10f;var pathPen new Pen(Color.Red, penWidth);//绘制路径e.Graphics.DrawPath(pathPen, path);//逆转path.Reverse();e.Graphics.DrawPath(Pens.Black, path);
} Transform矩阵变换
原型
public void Transform (System.Drawing.Drawing2D.Matrix matrix);作用应用一个矩阵变换到GraphicsPath中
var rect new Rectangle(200, 200, 300, 200); using (var path new GraphicsPath(FillMode.Winding))
{path.AddRectangle(rect);//原始矩形e.Graphics.DrawPath(Pens.Red,path);var matrix new Matrix();//向右、向下各偏移100matrix.Translate(100, 100, MatrixOrder.Append);path.Transform(matrix);e.Graphics.DrawPath(Pens.Black, path);matrix.Reset();//缩小0.5倍matrix.Scale(0.5f, 0.5f, MatrixOrder.Append);path.Transform(matrix);e.Graphics.DrawPath(Pens.LightGreen, path);
}定义一个矩形先向右、向左平移再缩小0.5倍
Wrap扭曲变换
原型
public void Warp (System.Drawing.PointF[] destPoints, System.Drawing.RectangleF srcRect);
public void Warp (System.Drawing.PointF[] destPoints, System.Drawing.RectangleF srcRect, System.Drawing.Drawing2D.Matrix? matrix);
public void Warp (System.Drawing.PointF[] destPoints, System.Drawing.RectangleF srcRect, System.Drawing.Drawing2D.Matrix? matrix, System.Drawing.Drawing2D.WarpMode warpMode);
public void Warp (System.Drawing.PointF[] destPoints, System.Drawing.RectangleF srcRect, System.Drawing.Drawing2D.Matrix? matrix, System.Drawing.Drawing2D.WarpMode warpMode, float flatness);作用通过定义目标平行四边形的三个顶点左上角、右上角和左下角或四边形的四个顶点来扭曲GraphicsPath中的路径。
var srcRect new Rectangle(200, 200, 300, 200);
Point point1 new Point(20, 200);
Point point2 new Point(100, 30);
Point point3 new Point(230, 300);
Point point4 new Point(380, 150);
Point[] points { point1, point2, point3, point4 };using (var path new GraphicsPath(FillMode.Winding))
{path.AddCurve(points);path.AddRectangle(srcRect);//原始矩形e.Graphics.DrawPath(new Pen(Color.Red,3), path);//定义平行四边形三个顶点左上角、右上角、左下角var destPtList new ListPointF(){new PointF(300,300),new PointF(600,250),new PointF(200,450)};// Create a translation matrix.Matrix translateMatrix new Matrix();// Warp the source path (rectangle).path.Warp(destPtList.ToArray(), srcRect, translateMatrix, WarpMode.Perspective, 0.5f);e.Graphics.DrawPath(new Pen(Color.LightGreen, 3), path);//加一个点自定义四边形destPtList.Add(new PointF(550, 450));//需要重置不重置的话是在前面warp变换后再次变换path.Reset();path.AddCurve(points);path.AddRectangle(srcRect);path.Warp(destPtList.ToArray(), srcRect, translateMatrix, WarpMode.Perspective, 0.5f);e.Graphics.DrawPath(new Pen(Color.LightBlue, 3), path);//path.Reset();path.AddCurve(points);path.AddRectangle(srcRect);translateMatrix.Translate(100, 50);path.Warp(destPtList.ToArray(), srcRect, translateMatrix, WarpMode.Perspective, 0.5f);e.Graphics.DrawPath(new Pen(Color.Pink, 3), path);} Widen将路径替换为指定画笔的填充区域
原型
public void Widen (System.Drawing.Pen pen, System.Drawing.Drawing2D.Matrix? matrix);
public void Widen (System.Drawing.Pen pen);
public void Widen (System.Drawing.Pen pen, System.Drawing.Drawing2D.Matrix? matrix, float flatness);作用将路径替换为指定画笔的填充区域类似获取膨胀后的轮廓 // 创建两个正方形.GraphicsPath myPath new GraphicsPath();myPath.AddRectangle(new Rectangle(300, 100, 100, 100));myPath.AddRectangle(new Rectangle(450, 100, 100, 100));// Draw the original ellipses to the screen in black.e.Graphics.DrawPath(Pens.Black, myPath);int offset 5;DrawString(e, $Src PointCount{myPath.PointCount}, ref offset);for(int i0;imyPath.PointCount;i){var pt myPath.PathPoints[i];var type myPath.PathTypes[i];DrawString(e, $\tPoint:({pt.X},{pt.Y}),types:{type}, ref offset);}// Widen the path.Pen widenPen new Pen(Color.Black, 20);Matrix widenMatrix new Matrix();//widenMatrix.Translate(50, 50);myPath.Widen(widenPen, widenMatrix, 1.0f);//绘制Widden后的路径e.Graphics.DrawPath(new Pen(Color.Red,3), myPath);//这里用FillPathe.Graphics.FillPath(new SolidBrush(Color.FromArgb(127,Color.LightGreen)), myPath);DrawString(e, $Widen PointCount{myPath.PointCount}, ref offset);for (int i 0; i myPath.PointCount; i){var pt myPath.PathPoints[i];var type myPath.PathTypes[i];DrawString(e, $\tPoint:({pt.X},{pt.Y}),types:{type}, ref offset);e.Graphics.FillEllipse(Brushes.Gold, pt.X - 3, pt.Y - 3, 6, 6);}
绘制两个正方形使用20像素宽的Pen对路径进行Widden后填充其路径就标记路径的各个点。 感谢您的拜读如果对本系列文章的源码感兴趣请在评讨区留言Email
