GDI+基础编程（2）——画刷的使用
代码中的注释还是很清楚的，在此不罗嗦了：
void CGDI画刷Dlg::GDIBrushDrawImage(CDC* pDC)
{
Graphics g(pDC->m_hDC);
//用单色画刷填充闭合曲线区域
SolidBrush solidBrush(Color(255,0,255,0));
PointF p1(30.0f,30.0f);
PointF p2(100.0,100.0f);
PointF p3(60.0,160.0f);
PointF p4(5.0f,100.0f);
PointF p5(30.0f,200.0f);
PointF pt[4]={p1,p2,p3,p4};
//填充闭合区域
g.FillClosedCurve(&solidBrush,pt,4,FillModeAlternate,1.0);
//构造比和多边形
PointF p[5]={p1,p2,p3,p4,p5};
//填充多边形
solidBrush.SetColor(Color(255,155,0,200));
g.FillPolygon(&solidBrush,p,5);
/*绘制正夜曲线
* 对应的数学公式为:
* R=A*Sin(N*Angle)
* X=R*Cos(Angle)
* Y=R*Sin(Angle)
*其中A相当于叶子的长度，N是决定叶子数量的一个常量，Angle相当于叶子的旋转角度*/
int cx,cy;
CRect rc;
GetClientRect(&rc);
//以当前窗口的正中心绘制正夜曲线
cx=rc.Width()/2;
cy=rc.Height()/2;
int LeafLen=200;//设置叶子长度
int LeafNum=20;
float PI=3.14;
int x,y,x2,y2,r;
GraphicsPath tempPath(FillModeAlternate);
for(float i=0.0f;i<PI*2+0.1f;i+=PI/180.0)
{
r=abs(LeafLen*cos(LeafNum*i));
x=r*cos(float(i));
y=r*sin(float(i));
x2=cx+x;
y2=cy+y;
tempPath.AddLine(x2,y2,x2,y2);
}
//接下来填充区域
g.FillPath(&solidBrush,&tempPath);
Pen pen1(Color(255,255,0,0),1);
g.DrawLine(&pen1,cx,0,cx,cy*2);
g.DrawLine(&pen1,0,cy,cx*2,cy);
//使用影线画刷
Color black(255,0,0,0),white(255,255,255,255);
HatchBrush brush(HatchStyleHorizontal,black,white);//风格1
g.FillRectangle(&brush,100,40,100,50);
//////////////////////////////////////////////////////////
HatchBrush br1(HatchStyleVertical,black,white);//风格2
g.FillRectangle(&br1,210,40,100,50);
//////////////////////////////////////////////////////////
HatchBrush br2(HatchStyleForwardDiagonal,black,white);//风格3
g.FillRectangle(&br2,320,40,100,50);
//////////////////////////////////////////////////////////
HatchBrush br3(HatchStyleBackwardDiagonal,black,white);//风格4
g.FillRectangle(&br3,430,40,100,50);
/////////////////////////////////////////////////////////
HatchBrush br4(HatchStyleCross,black,white);//风格5
g.FillRectangle(&br4,150,100,100,50);
///////////////////////////////////////////////////////
HatchBrush br5(HatchStyleDiagonalCross,black,white);//风格6-交叉对角线
g.FillRectangle(&br5,380,100,100,50);
Color black(255,0,0,0);
Color white(255,255,255,255);
SolidBrush redBrush(Color(255,255,0,0));
Pen pen(Color(255,0,0,255));
CRect rc;
GetClientRect(&rc);
int columnCount=(int)rc.Width()/40;//设定每块矩形的大小为40X40
int rol=0;
int column=0;
CString str;
WCHAR WideChar[2];
Font ft(L"Arial",16);
//在当前窗口使用53种风格的影线画刷填充矩形
for(int i=0;i<53;i++)
{
if(rol>columnCount-1)
{
column++;
rol=0;
}
HatchBrush tempBrush(HatchStyle(i),black,white);
g.FillRectangle(&tempBrush,rol*40,column*40,35,35);//填充矩形区域
g.DrawRectangle(&pen,rol*40,column*40,35,35);//绘制边框
str.Format(L"%d",i);
int strLen=str.GetLength();
memcpy(WideChar,str.GetBuffer(),sizeof(WideChar));
StringFormat format;
RectF rect(rol*40,column*40,35,35);
format.SetAlignment(StringAlignmentCenter);
format.SetLineAlignment(StringAlignmentCenter);
g.DrawString(WideChar,strLen,&ft,rect,&format,&redBrush);
rol++;
}
/*设置画刷原点*/
Color black(255,0,0,0),white(255,255,255,255);
HatchBrush hatchBrush(HatchStyle(20),black,white);
//在垂直方向填充8个矩形，使用默认的画刷原点
for(int i=0;i<8;i++)
g.FillRectangle(&hatchBrush,0,i*50,100,50);
//使用不同的画刷原点
for(int i=0;i<8;i++)
{
g.SetRenderingOrigin(i,0);
g.FillRectangle(&hatchBrush,100,i*50,100,50);
}
/*使用纹理画刷，纹理化刷实际是将图片在目标区域进行平铺*/
Pen pen(Color(255,0,0,255),2);
SolidBrush brush(Color(255,0,0,0));
Font font(L"宋体",20);
RectF rc1(10,10,200,200);
RectF rc2(210,10,200,200);
RectF rc3(410,10,200,200);
Image image(L"2.jpg");
TextureBrush textureBrush(&image);//构造纹理化刷使用默认方式
g.FillEllipse(&textureBrush,rc1);
g.DrawEllipse(&pen,rc1);
g.DrawString(L"图片原始大小",6,&font,PointF(40,220),NULL,&brush);
//方法二，只使用给定图片的部分区域
TextureBrush tBrush2(&image,Rect(0,0,60,50));
g.FillEllipse(&tBrush2,rc2);
g.DrawEllipse(&pen,rc2);
g.DrawString(L"只用部分区域",6,&font,PointF(240,220),NULL,&brush);
/*构造纹理化刷3：将制定图片进行缩放*/
TextureBrush tBrush3(&image);
tBrush3.SetTransform(&Matrix(0.5f,0.0f,0.0f,0.5f,0.0f,0.0f));//对话刷进行50%的缩放
g.FillEllipse(&tBrush3,rc3);
g.DrawEllipse(&pen,rc3);
g.DrawString(L"比例缩小图",6,&font,PointF(440,220),NULL,&brush);
}