GDI+和GDI的一些基本图形描绘方法的对比

最新推荐文章于 2020-11-09 16:36:04 发布

转载最新推荐文章于 2020-11-09 16:36:04 发布 · 1.2k 阅读

文章标签：

#gdi+ #图形 #360

本文介绍使用GDI+与GDI进行基本图形绘制的方法，包括清空背景、绘制对角线、网格、圆弧及填充多边形等，并展示了如何设置字体、颜色及画笔宽度。

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GDI+

GDI

//清空背景

SolidBrush brush(Color(255, 255,255,255));

using namespace Gdiplus;

pGraphics->FillRectangle(&brush,0,0,m_winWidth,m_winHeight);

//画笔准备

int PenWidth = theApp.m_optionDlg.m_iSliderPenWidth;

Pen pen(Color(255, 0, 0, 255), PenWidth);

Pen pen2(Color(255, 255, 0, 0), PenWidth);

//-------------------------------------------

//画对角线

pGraphics->DrawLine(&pen,pRect->left,pRect->top,pRect->right, pRect->bottom);

pGraphics->DrawLine(&pen,pRect->right,pRect->top,pRect->left, pRect->bottom);

//-------------------------------------------

//画格子

for (int y = 0; y < m_winHeight; y += 10) {

pGraphics->DrawLine(&pen, 0, y, m_winWidth, y);

}

for (int x = 0; x < m_winWidth; x += 10) {

pGraphics->DrawLine(&pen, x, 0, x, m_winHeight);

}

//-------------------------------------------

//画圆弧

pGraphics->DrawArc(&pen2, 0,0, 100,100, 0.0f,360.0f);

//-------------------------------------------

//画填充多边形

SolidBrush fillPolyBrush(Color(128, 255, 0, 0));

Point point1(100, 100);

Point point2(200, 130);

Point point3(250, 160);

Point point4(150, 200);

Point point5( 70, 130);

Point points[5] = {point1, point2, point3, point4, point5};

pGraphics->FillPolygon(&fillPolyBrush, points, 5);

//-------------------------------------------

//字符串

if (theApp.m_optionDlg.m_strDrawString != "") {

// UNICODE字串变换

_bstr_t bstr(theApp.m_optionDlg.m_strDrawString);

Font myFont(L"Arial", 42);

PointF origin(0.0f, 0.0f);

SolidBrush blackBrush(Color(255, 0, 0, 0));

StringFormat format;

format.SetAlignment(StringAlignmentCenter);

pGraphics->DrawString(

bstr,

bstr.length(),

&myFont,

origin,

&blackBrush);

}

//清空背景

CBrush brush;

brush.CreateSolidBrush(RGB(255, 255, 255));

//初始画刷保存

CBrush OrigBrush;

CBrush *pTmpBrush = (CBrush*)pDC->SelectObject(brush);

OrigBrush.FromHandle((HBRUSH)pTmpBrush);

pDC->Rectangle(pRect);

pDC->SelectObject(&OrigBrush);

brush.DeleteObject();

//画笔准备

int PenWidth = theApp.m_optionDlg.m_iSliderPenWidth;

CPen pen(PS_SOLID, PenWidth, RGB(0, 0, 255));

CPen pen2(PS_SOLID, PenWidth, RGB(255, 0, 0));

//初始画笔保存

CPen OrigPen;

CPen *pTmpPen = (CPen*)pDC->SelectObject(pen);

OrigPen.FromHandle((HPEN)pTmpPen);

//-------------------------------------------

//画笔准备

pDC->MoveTo(pRect->left, pRect->top);

pDC->LineTo(pRect->right, pRect->bottom);

pDC->MoveTo(pRect->right, pRect->top);

pDC->LineTo(pRect->left, pRect->bottom);

//-------------------------------------------

//画格子

for (int y = 0; y < m_winHeight; y += 10) {

pDC->MoveTo(0, y);

pDC->LineTo(m_winWidth, y);

}

for (int x = 0; x < m_winWidth; x += 10) {

pDC->MoveTo(x, 0);

pDC->LineTo(x, m_winHeight);

}

pDC->SelectObject(&OrigPen);

pen.DeleteObject();

//-------------------------------------------

//画圆弧

long width, height;

POINT cpos;

double r,srad,erad;

const double m_pi = 3.1415926535758932;

width = 100 - 0;

height = 100 - 0;

cpos.x = 0 + (long)(width / 2.0);

cpos.y = 0 + (long)(height / 2.0);

r = max(width / 2.0, height / 2.0);

srad = 0.0 * m_pi / 180.0;

erad = (0.0 + 360.0) * m_pi / 180.0;

pTmpPen = (CPen*)pDC->SelectObject(pen2);

pDC->Arc(0,0, 100,100,

cpos.x + (long)(r * cos(srad)),

cpos.y + (long)(r * sin(srad)),

cpos.x + (long)(r * cos(erad)),

cpos.y + (long)(r * sin(erad)));

pDC->SelectObject(&OrigPen);

pen2.DeleteObject();

//-------------------------------------------

//画填充多边形

CBrush fillPolyBrush;

fillPolyBrush.CreateSolidBrush(RGB(255, 0, 0));

pTmpBrush = (CBrush*)pDC->SelectObject(fillPolyBrush);

CPoint point1(100, 100);

CPoint point2(200, 130);

CPoint point3(250, 160);

CPoint point4(150, 200);

CPoint point5( 70, 130);

CPoint points[5] = {point1, point2, point3, point4, point5};

pDC->Polygon(points, 5);

pDC->SelectObject(&OrigBrush);

fillPolyBrush.DeleteObject();

//-------------------------------------------

//符串

if (theApp.m_optionDlg.m_strDrawString != "") {

//UNICODE字串变换

_bstr_t bstr(theApp.m_optionDlg.m_strDrawString);

CFont myFont;

CFont OrigFont;

myFont.CreatePointFont(420, "Arial");

CFont *pTmpFont = (CFont*)pDC->SelectObject(myFont);

OrigFont.FromHandle((HFONT)pTmpFont);

CBrush blackBrush;

blackBrush.CreateSolidBrush(RGB(0, 0, 0));

pTmpBrush = (CBrush*)pDC->SelectObject(blackBrush);

//pDC->SetTextAlign(TA_CENTER);

pDC->TextOut(0, 0, bstr, bstr.length());

pDC->SelectObject(&OrigFont);

myFont.DeleteObject();

}