Direct2D 第2篇绘制椭圆

最新推荐文章于 2023-07-20 20:06:24 发布

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最新推荐文章于 2023-07-20 20:06:24 发布 · 1.7k 阅读

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CC 4.0 BY-SA版权

文章标签：

#D2D #Direct2D #GDI #VC #2d

本文深入探讨了Direct2D库中绘制椭圆的方法，通过实例讲解如何使用Direct2D API创建并渲染精确的椭圆形状，对比了与传统GDI的区别，并提供了VC++实现代码。

#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;

void OnSize(LPARAM lparam)
{
	if(g_render_target)
		g_render_target->Resize(D2D1::SizeU(LOWORD(lparam),HIWORD(lparam)));
}

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::ForestGreen), &g_brush);

	return