Direct2D 第4篇 渐变画刷

#include <windows.h>
#include <d2d1.h>
#include <d2d1helper.h>
#include <dwrite.h>
#pragma comment(lib, "dwrite.lib")
#pragma comment(lib, "d2d1.lib")HINSTANCE g_hinst;
HWND g_hwnd;ID2D1Factory * g_factory;
ID2D1HwndRenderTarget * g_render_target;
ID2D1SolidColorBrush * g_brush;IDWriteFactory * g_write_factory;
IDWriteTextFormat * g_text_format;ID2D1GradientStopCollection * g_gradient_stop_collection;
ID2D1LinearGradientBrush * g_linear_gradient_brush;
ID2D1RadialGradientBrush * g_radial_gradient_brush;bool AppInit()
{
D2D1CreateFactory(D2D1_FACTORY_TYPE_SINGLE_THREADED, &g_factory);RECT rc;
GetClientRect(g_hwnd, &rc);g_factory->CreateHwndRenderTarget(
D2D1::RenderTargetProperties(),
D2D1::HwndRenderTargetProperties(g_hwnd, D2D1::SizeU(rc.right - rc.left, rc.bottom - rc.top)),
&g_render_target);g_render_target->CreateSolidColorBrush(D2D1::ColorF(D2D1::ColorF::WhiteSmoke), &g_brush);// Init Font
DWriteCreateFactory(DWRITE_FACTORY_TYPE_SHARED,__uuidof(g_write_factory),reinterpret_cast<IUnknown **>(&g_write_factory));
g_write_factory->CreateTextFormat(L"Arial Block", NULL, DWRITE_FONT_WEIGHT_NORMAL,
DWRITE_FONT_STYLE_NORMAL, DWRITE_FONT_STRETCH_NORMAL, 40, L"",&g_text_format);// Create Gradient Stops
D2D1_GRADIENT_STOP gradient_stops[3];
gradient_stops[0].color = D2D1::ColorF(D2D1::ColorF::YellowGreen);
gradient_stops[0].position = 0.0f;
gradient_stops[1].color = D2D1::ColorF(D2D1::ColorF::ForestGreen);
gradient_stops[1].position = 0.5f;
gradient_stops[2].color = D2D1::ColorF(D2D1::ColorF::Green);
gradient_stops[2].position = 1.0f;// Create Interface
g_render_target->CreateGradientStopCollection(gradient_stops, 3, &g_gradient_stop_collection);// Create Linear Gradient Brush
g_render_target->CreateLinearGradientBrush(
D2D1::LinearGradientBrushProperties(D2D1::Point2F(0,0), D2D1::Point2F(600,600)),
g_gradient_stop_collection, &g_linear_gradient_brush);g_render_target->CreateRadialGradientBrush(
D2D1::RadialGradientBrushProperties(D2D1::Point2F(500,500),D2D1::Point2F(),1000.0f,1000.0f),
g_gradient_stop_collection,&g_radial_gradient_brush);return true;
}void OnSize(LPARAM lparam)
{
if(g_render_target)
g_render_target->Resize(D2D1::SizeU(LOWORD(lparam),HIWORD(lparam)));
}void OnPaint()
{
if(!g_render_target)
return;g_render_target->BeginDraw();// Clear Background
g_render_target->Clear(D2D1::ColorF(0.63, 0.84, 0.00)); // Draw Ellipse
D2D1_SIZE_F size = g_render_target->GetSize();
D2D1_ELLIPSE ellipse;
ellipse.point = D2D1::Point2F(size.width/2.0, size.height/2.0);
ellipse.radiusX = 280;
ellipse.radiusY = 100;
g_render_target->FillEllipse(&ellipse, g_radial_gradient_brush);
//g_render_target->FillEllipse(&ellipse, g_linear_gradient_brush); // Draw Text
const wchar_t * text = L"Direct2D Gradient Brush";
g_render_target->DrawText(text, wcslen(text),
g_text_format,
D2D1::RectF(100, 190, size.width, size.height),
g_brush);g_render_target->EndDraw();
}void OnDestroy()
{
g_linear_gradient_brush->Release();
g_radial_gradient_brush->Release();
g_gradient_stop_collection->Release();
g_text_format->Release();
g_write_factory->Release();
g_brush->Release();
g_render_target->Release();
g_factory->Release();
}LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam)
{
switch(msg)
{
case WM_PAINT:
OnPaint();
break;case WM_SIZE:
OnSize(lparam);
break;case WM_DESTROY:
OnDestroy();
PostQuitMessage(0);
break;default:
return DefWindowProc(hwnd, msg, wparam, lparam);
}
return 0;
}int WINAPI WinMain(HINSTANCE hinst, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
WNDCLASSEX wc;
MSG msg; memset(&wc,0,sizeof(wc));
wc.cbSize = sizeof(WNDCLASSEX);
wc.lpfnWndProc = WndProc;
wc.hInstance = hinst;
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
wc.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
wc.lpszClassName = "WindowClass";
wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
wc.hIconSm = LoadIcon(NULL, IDI_APPLICATION); if(!RegisterClassEx(&wc))
{
MessageBox(NULL, "Window Registration Failed!","Error!",MB_ICONEXCLAMATION|MB_OK);
return 0;
}g_hinst = hinst;g_hwnd = CreateWindowEx(WS_EX_CLIENTEDGE,"WindowClass","Direct2D Demo",WS_VISIBLE|WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT,
CW_USEDEFAULT,
640,
480,
NULL, NULL, hinst, NULL);if(g_hwnd == NULL)
{
MessageBox(NULL, "Window Creation Failed!","Error!",MB_ICONEXCLAMATION|MB_OK);
return 0;
}if(!AppInit())
{
MessageBox(NULL, "Application Initialisation Failed !","Error",MB_ICONEXCLAMATION|MB_OK);
return 0;
}while(GetMessage(&msg, NULL, 0, 0) > 0)
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}return msg.wParam;
}