C#创建不规则窗体的4种方式详解
现在,c#创建不规则窗体不是一件难事,下面总结一下:
一、自定义窗体
一般为规则的图形,如圆、椭圆等。
做法:重写form1_paint事件(form1是窗体的名字),最简单的一种情况如下:
system.drawing.drawing2d.graphicspath shape = new system.drawing.drawing2d.graphicspath(); shape.addellipse(0,0,this.height, this.width); this.region = new region(shape);
即重绘窗体的规则。
二、利用背景图片实现
1. 设置窗体的背景图片,其中背景图片是24位(不包括24)以下的位图(bmp图片),并且要设置tansparencykey的值,一般为你背景图片的背景色,即创建不规则图片时的底色,一般设为你图片中没有的颜色。
这种做法的不好的地方就是背景图片一定要16位或者更低的,而且还要确保客户端的显示。如果监视器的颜色深度设置大于 24 位,则不管 transparencykey 属性是如何设置的,窗体的非透明部分都会产生显示问题。若要避免出现这种问题,请确保“显示”控制面板中的监视器颜色深度的设置小于 24 位。当开发具有这种透明功能的应用程序时,请牢记应使您的用户意识到此问题。
实现步骤如下:
1. 新建windows application
2. 选择窗体,找到backgroundimage属性,点击打开新的窗口,选择下面的导入资源文件,选择你的不规则的bmp图片
3. 找到窗体的tansparencykey,将它设置为你背景图片的背景色(如黄色)
4. 找到窗体的formborderstyle,将其设置为none,即不显示标题栏
5. 运行
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2. 跟背景图片一样的图形,不过是动态加载,遍历位图以实现不规则窗体。它的原理是这样的,在form的load事件中写方法使得窗体的描绘区域发生改变。
实现步骤如下:
1. 建立winform应用程序
2. 找到窗体的load事件,双击进行编辑
3. 编写方法,主要的代码如下:
class bitmapregion { public bitmapregion() { } /// <summary> /// create and apply the region on the supplied control /// 创建支持位图区域的控件(目前有button和form) /// </summary> /// <param name="control">the control object to apply the region to控件</param> /// <param name="bitmap">the bitmap object to create the region from位图</param> public static void createcontrolregion(control control, bitmap bitmap) { // return if control and bitmap are null //判断是否存在控件和位图 if (control == null || bitmap == null) return; // set our control''s size to be the same as the bitmap //设置控件大小为位图大小 control.width = bitmap.width; control.height = bitmap.height; // check if we are dealing with form here //当控件是form时 if (control is system.windows.forms.form) { // cast to a form object //强制转换为form form form = (form)control; // set our form''s size to be a little larger that the bitmap just // in case the form''s border style is not set to none in the first place //当form的边界formborderstyle不为none时,应将form的大小设置成比位图大小稍大一点 form.width = control.width; form.height = control.height; // no border //没有边界 form.formborderstyle = formborderstyle.none; // set bitmap as the background image //将位图设置成窗体背景图片 form.backgroundimage = bitmap; // calculate the graphics path based on the bitmap supplied //计算位图中不透明部分的边界 graphicspath graphicspath = calculatecontrolgraphicspath(bitmap); // apply new region //应用新的区域 form.region = new region(graphicspath); } // check if we are dealing with button here //当控件是button时 else if (control is system.windows.forms.button) { // cast to a button object //强制转换为 button button button = (button)control; // do not show button text //不显示button text button.text = ""; // change cursor to hand when over button //改变 cursor的style button.cursor = cursors.hand; // set background image of button //设置button的背景图片 button.backgroundimage = bitmap; // calculate the graphics path based on the bitmap supplied //计算位图中不透明部分的边界 graphicspath graphicspath = calculatecontrolgraphicspath(bitmap); // apply new region //应用新的区域 button.region = new region(graphicspath); } } /// <summary> /// calculate the graphics path that representing the figure in the bitmap /// excluding the transparent color which is the top left pixel. /// //计算位图中不透明部分的边界 /// </summary> /// <param name="bitmap">the bitmap object to calculate our graphics path from</param> /// <returns>calculated graphics path</returns> private static graphicspath calculatecontrolgraphicspath(bitmap bitmap) { // create graphicspath for our bitmap calculation //创建 graphicspath graphicspath graphicspath = new graphicspath(); // use the top left pixel as our transparent color //使用左上角的一点的颜色作为我们透明色 color colortransparent = bitmap.getpixel(0, 0); // this is to store the column value where an opaque pixel is first found. // this value will determine where we start scanning for trailing opaque pixels. //第一个找到点的x int colopaquepixel = 0; // go through all rows (y axis) // 偏历所有行(y方向) for (int row = 0; row < bitmap.height; row++) { // reset value //重设 colopaquepixel = 0; // go through all columns (x axis) //偏历所有列(x方向) for (int col = 0; col < bitmap.width; col++) { // if this is an opaque pixel, mark it and search for anymore trailing behind //如果是不需要透明处理的点则标记,然后继续偏历 if (bitmap.getpixel(col, row) != colortransparent) { // opaque pixel found, mark current position //记录当前 colopaquepixel = col; // create another variable to set the current pixel position //建立新变量来记录当前点 int colnext = col; // starting from current found opaque pixel, search for anymore opaque pixels // trailing behind, until a transparent pixel is found or minimum width is reached ///从找到的不透明点开始,继续寻找不透明点,一直到找到或则达到图片宽度 for (colnext = colopaquepixel; colnext < bitmap.width; colnext++) if (bitmap.getpixel(colnext, row) == colortransparent) break; // form a rectangle for line of opaque pixels found and add it to our graphics path //将不透明点加到graphics path graphicspath.addrectangle(new rectangle(colopaquepixel, row, colnext - colopaquepixel, 1)); // no need to scan the line of opaque pixels just found col = colnext; } } } // return calculated graphics path return graphicspath; } }
4.运行
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三、调用类库实现
主要就是根据一些坐标,然后根据这些坐标绘制窗体
代码如下:
public form3() { initializecomponent(); //创建不规则窗体 pointapi[] poin; poin = new pointapi[5]; poin[0].x = 90; poin[0].y = 90; poin[1].x = this.width; poin[1].y = 0; poin[2].x = width; poin[2].y = this.height / 2; poin[3].x = width / 2; poin[3].y = height / 2; poin[4].x = 0; poin[4].y = width; boolean flag = true; intptr hrgn = createpolygonrgn(ref poin[0], 8, 1); setwindowrgn(this.handle, hrgn, ref flag); this.backcolor = color.burlywood; } [structlayout(layoutkind.sequential)] private struct pointapi { internal int x; internal int y; } [dllimport("gdi32.dll")] private static extern intptr createpolygonrgn(ref pointapi lppoint,int ncount,int npolyfillmode); [dllimport("user32.dll")] private static extern intptr setwindowrgn(intptr hwnd,intptr hrgn, ref boolean bredraw); //设置窗体显示状态 [dllimport("user32.dll")] private static extern int setwindowpos(intptr hwnd,int hwndinsertafter,int x,int y,int cx,int cy,int wflags); private void start_btn_click(object sender, eventargs e) {//始终显示在前面 setwindowpos(this.handle, -1, 0, 0, 0, 0, 1); } private void button1_click(object sender, eventargs e) { //最小化始终显示在前面 setwindowpos(this.handle, -1, 0, 0, 0, 0, 0); }
当然,我们也可以自定义窗体的动作,如按着某个轨迹一定,下面的代码中的backgroundform程序中就小试了一下,效果还不错,下面是这些程序的效果图:
代码是.net 2.0的,也可以转换为其他版本的,只要运行主程序即可。
以上的四种方法有利也有弊,希望大家提意见或者更好的解决方案。