love.graphics.push (简体中文)

Copies and pushes the current coordinate transformation to the transformation stack.

This function is always used to prepare for a corresponding pop operation later. It stores the current coordinate transformation state into the transformation stack and keeps it active. Later changes to the transformation can be undone by using the pop operation, which returns the coordinate transform to the state it was in before calling push.

Function

Pushes the current transformation to the transformation stack.

函数本体

love.graphics.push( )

参数

无参数

返回值

无返回值

Function

Available since LÖVE 0.9.2
This variant is not supported in earlier versions.

Pushes a specific type of state to the stack.

Synopsis

love.graphics.push( stack )

Arguments

StackType stack
The type of stack to push (e.g. just transformation state, or all love.graphics state).

Returns

Nothing.

Examples

Modify and restore the coordinate system. 

function love.draw()
	love.graphics.push() -- 储存默认的坐标体系
	love.graphics.translate(...) -- 移动摄像头的位置
	love.graphics.scale(...) -- 放大(缩小)视角
	-- 使用新的坐标体系去绘制被观察的物体
	love.graphics.pop() -- 回到默认的坐标体系
	-- 使用屏幕的坐标绘制状态显示
end
Available since LÖVE 0.9.2
This example is not supported in earlier versions.

Modify love.graphics state in a function, and restore it easily so other code isn't disturbed. 

function DrawCoolThing()
    love.graphics.push("all") -- save all love.graphics state so any changes can be restored

    love.graphics.setColor(0, 0, 255)
    love.graphics.setBlendMode("subtractive")

    love.graphics.circle("fill", 400, 300, 80)

    love.graphics.pop() -- restore the saved love.graphics state
end

function love.draw()
    love.graphics.setColor(255, 128, 128)
    love.graphics.circle("fill", 400, 300, 100)

    DrawCoolThing()

    love.graphics.rectangle("fill", 600, 200, 200, 200) -- still uses the color set at the top of love.draw
end

See Also


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