Difference between revisions of "Canvas (简体中文)"

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== 构造函数 ==
 
== 构造函数 ==
{{#ask: [[Category:Functions]] [[Constructs::Canvas]]
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{{#ask: [[Category:Functions]] [[Constructs::Canvas (简体中文)]]
 
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== 函数 ==
 
== 函数 ==
{{#ask: [[Category:Functions]] [[parent::Canvas||Drawable||Object]] [[Concept:Current]]
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{{#ask: [[Category:Functions]] [[parent::Canvas (简体中文)||Drawable (简体中文)||Object (简体中文)]] [[Concept:Current]]
 
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== 父类 ==
 
== 父类 ==
* [[parent::Texture]]
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* [[parent::Texture (简体中文)]]
* [[parent::Drawable]]
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* [[parent::Drawable (简体中文)]]
* [[parent::Object]]
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* [[parent::Object (简体中文)]]
 
== 范例 ==
 
== 范例 ==
 
=== 绘制一些东西到Canvas上,然后覆盖在画面上。 ===
 
=== 绘制一些东西到Canvas上,然后覆盖在画面上。 ===
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== 参考 ==
 
== 参考 ==
 
* [[parent::love.graphics (简体中文)]]
 
* [[parent::love.graphics (简体中文)]]
* [[love.graphics.setCanvas]]
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* [[love.graphics.setCanvas (简体中文)]]
* [[love.graphics.isSupported]]
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* [[love.graphics.isSupported (简体中文)]]
 
[[Category:Types]]
 
[[Category:Types]]
 
{{#set:Description=Off-screen render target.}}
 
{{#set:Description=Off-screen render target.}}

Revision as of 19:50, 6 January 2015

Available since LÖVE 0.8.0
Framebuffer重命名而来.

Canvas用于离屏渲染。可以把它看成是一种无形的屏幕,你可以在上面绘制一些东西,但直到你将它设置为可见的之前,它都不会被看见不可见的。它也被称为“纹理渲染(render to texture)”。

在Canvas上绘制一些不经常改变的东西(如背景图案),然后再把Canvas绘制绘制出来来取代每个东西都独自绘制, 可以减少画面每帧拉伸操作的次数。

Canvases can be susceptible to power of 2 syndrome. Most graphics cards that support Canvas should have non-PO2 texture support. However, there are some old cards that do not. Check with love.graphics.isSupported("npot") if it is supported.

O.png 有些很老的显卡不支持Canvas,如果你试图使用它们将抛出一个错误。在运行时使用 love.graphics.isSupported("canvas") 来检查是否支持。  


构造函数

love.graphics.newCanvas (简体中文) 创建一个新的 Canvas(画布) Added since 0.8.0

函数

Object:release (简体中文) 立即摧毁对象在 Lua 中的引用 Added since 11.0

父类

范例

绘制一些东西到Canvas上,然后覆盖在画面上。

function love.load()
	canvas = love.graphics.newCanvas(800, 600)

	-- 在Canvas上用Alpha混合模式绘制一个矩形。
	love.graphics.setCanvas(canvas)
		canvas:clear()
		love.graphics.setBlendMode('alpha')
		love.graphics.setColor(255, 0, 0, 128)
		love.graphics.rectangle('fill', 0, 0, 100, 100)
	love.graphics.setCanvas()
end

function love.draw()
	love.graphics.setColor(255, 255, 255, 255)
	
	-- Canvas上的矩形已经使用alpha混合。
	-- 绘Canvas布本身时,以防止其他混合使用premultiplied混合模式。
	love.graphics.setBlendMode('premultiplied')
	love.graphics.draw(canvas)
	-- 展示Canvas使用了alpha混合模式的差异。
	love.graphics.setBlendMode('alpha')
	love.graphics.draw(canvas, 100, 0)

	-- 矩形直接画到与Alpha混合模式的画面。
	love.graphics.setBlendMode('alpha')
	love.graphics.setColor(255, 0, 0, 128)
	love.graphics.rectangle('fill', 200, 0, 100, 100)
end

参考


其他语言