Difference between revisions of "love.graphics.draw"

(explain transformation)
m (Default sy is really sx (see https://github.com/love2d/love/blob/main/src/modules/graphics/wrap_SpriteBatch.h#L46), and there really was drawq functions (love.graphics.drawq))
 
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−
Draw objects on screen.
+
Draws a [[Drawable]] object (an [[Image]], [[Canvas]], [[SpriteBatch]], [[ParticleSystem]], [[Mesh]], [[Text]] object, or [[Video]]) on the screen with optional rotation, scaling and shearing.
 +
 
 +
Objects are drawn relative to their local coordinate system. The origin is by default located at the top left corner of [[Image]] and [[Canvas]] objects. All scaling, shearing, and rotation arguments transform the object relative to that point.
 +
 
 +
It's possible to rotate an object about, for example, its center by offsetting the origin to the center. Angles must be given in radians for rotation. One can also use negative scaling factors to flip the object about its origin.
 +
 
 +
Note that the offsets are applied before rotation, scaling, or shearing; scaling and shearing are applied before rotation.
 +
 
 +
The right and bottom edges of the object are shifted at an angle defined by the shearing factors.
 +
 
 +
When using the default shader anything drawn with this function will be tinted according to the currently selected color. Set it to pure white to preserve the object's original colors.
 +
 
 
== Function ==
 
== Function ==
 
=== Synopsis ===
 
=== Synopsis ===
 
<source lang="lua">
 
<source lang="lua">
−
love.graphics.draw( drawable, x, y, r, sx, sy, ox, oy )
+
love.graphics.draw( drawable, x, y, r, sx, sy, ox, oy, kx, ky )
 
</source>
 
</source>
 
=== Arguments ===
 
=== Arguments ===
 
{{param|Drawable|drawable|A drawable object.}}
 
{{param|Drawable|drawable|A drawable object.}}
 +
{{param|number|x (0)|The position to draw the object (x-axis).}}
 +
{{param|number|y (0)|The position to draw the object (y-axis).}}
 +
{{param|number|r (0)|Orientation (radians).}}
 +
{{param|number|sx (1)|Scale factor (x-axis).}}
 +
{{param|number|sy (sx)|Scale factor (y-axis).}}
 +
{{param|number|ox (0)|Origin offset (x-axis).}}
 +
{{param|number|oy (0)|Origin offset (y-axis).}}
 +
{{New feature|0.8.0|
 +
{{param|number|kx (0)|Shearing factor (x-axis).}}
 +
{{param|number|ky (0)|Shearing factor (y-axis).}}
 +
|080}}
 +
=== Returns ===
 +
Nothing.
 +
 +
== Function ==
 +
{{newin|[[0.9.0]]|090|type=variant|text=It has replaced [[love.graphics.drawq]]}}
 +
=== Synopsis ===
 +
<source lang="lua">
 +
love.graphics.draw( texture, quad, x, y, r, sx, sy, ox, oy, kx, ky )
 +
</source>
 +
=== Arguments ===
 +
{{param|Texture|texture|A [[Texture]] ([[Image]] or [[Canvas]]) to texture the [[Quad]] with.}}
 +
{{param|Quad|quad|The Quad to draw on screen.}}
 
{{param|number|x|The position to draw the object (x-axis).}}
 
{{param|number|x|The position to draw the object (x-axis).}}
 
{{param|number|y|The position to draw the object (y-axis).}}
 
{{param|number|y|The position to draw the object (y-axis).}}
 
{{param|number|r (0)|Orientation (radians).}}
 
{{param|number|r (0)|Orientation (radians).}}
−
{{param|number|sx (1)|Scale factor (x-axis). Can be negative.}}
+
{{param|number|sx (1)|Scale factor (x-axis).}}
−
{{param|number|sy (sx)|Scale factor (y-axis). Can be negative.}}
+
{{param|number|sy (sx)|Scale factor (y-axis).}}
−
{{param|number|ox (0)|Origin offset (x-axis). (A value of 20 would effectively move your drawable object 20 pixels to the left.)}}
+
{{param|number|ox (0)|Origin offset (x-axis).}}
−
{{param|number|oy (0)|Origin offset (y-axis). (A value of 20 would effectively move your drawable object 20 pixels up.)}}
+
{{param|number|oy (0)|Origin offset (y-axis).}}
 +
{{param|number|kx (0)|Shearing factor (x-axis).}}
 +
{{param|number|ky (0)|Shearing factor (y-axis).}}
 
=== Returns ===
 
=== Returns ===
 
Nothing.
 
Nothing.
−
=== Note ===
 
−
love.graphics.draw() anchors from the top left corner by default.
 
  
−
You can specify a negative value for sx or sy to flip the drawable horizontally or vertically.
+
== Function ==
 +
{{newin|[[11.0]]|110|type=variant}}
 +
=== Synopsis ===
 +
<source lang="lua">
 +
love.graphics.draw( drawable, transform )
 +
</source>
 +
=== Arguments ===
 +
{{param|Drawable|drawable|A drawable object.}}
 +
{{param|Transform|transform|Transformation object.}}
 +
=== Returns ===
 +
Nothing.
 +
 
 +
== Function ==
 +
{{newin|[[11.0]]|110|type=variant}}
 +
=== Synopsis ===
 +
<source lang="lua">
 +
love.graphics.draw( texture, quad, transform )
 +
</source>
 +
=== Arguments ===
 +
{{param|Texture|texture|A [[Texture]] ([[Image]] or [[Canvas]]) to texture the [[Quad]] with.}}
 +
{{param|Quad|quad|The Quad to draw on screen.}}
 +
{{param|Transform|transform|Transformation object.}}
 +
=== Returns ===
 +
Nothing.
 +
 
 +
== Examples ==
 +
=== Draw an image (the [[:File:Resource-HamsterBall.png|Hamster Ball]]) at 100 by 100 pixels ===
 +
<source lang="lua">
 +
function love.load()
 +
hamster = love.graphics.newImage("hamster.png")
 +
end
 +
function love.draw()
 +
love.graphics.draw(hamster, 100,100)
 +
end
 +
</source>
 +
=== Draw an image (the [[:File:Resource-HamsterBall.png|Hamster Ball]]) from the center at 100 by 100 pixels, rotating over time ===
 +
<source lang="lua">
 +
function love.load()
 +
hamster = love.graphics.newImage("hamster.png")
 +
end
 +
function love.draw()
 +
local width  = hamster:getWidth()
 +
local height = hamster:getHeight()
 +
local angle  = love.timer.getTime() * 2*math.pi / 2.5 -- Rotate one turn per 2.5 seconds.
 +
love.graphics.draw(hamster, 100,100, angle, 1,1, width/2, height/2)
 +
end
 +
</source>
 +
----
 +
{{newin|[[0.9.0]]|090|type=functionality}}
 +
=== Draw the top half of an image (the [[:File:Resource-HamsterBall.png|Hamster Ball]]) at 100 by 100 pixels. ===
 +
<source lang="lua">
 +
function love.load()
 +
hamster      = love.graphics.newImage("hamster.png")
 +
local width  = hamster:getWidth()
 +
local height = hamster:getHeight()
 +
quad        = love.graphics.newQuad(0,0, width,height/2, width,height)
 +
end
 +
function love.draw()
 +
love.graphics.draw(hamster,quad, 100,100)
 +
end
 +
</source>
 +
 
 +
 
 +
=== Draw the flying [[:File:rocket.png|rocket]] directed to the mouse pointer ===
 +
<source lang="lua">
 +
function love.load()
 +
local image = love.graphics.newImage ('rocket.png')
 +
Rocket ={x=200,y=200,angle=0,image=image,ox=image:getWidth()/2,oy=image:getHeight()/2}
 +
end
 +
function love.update(dt)
 +
local mx, my = love.mouse.getPosition()
 +
local dx, dy = mx-Rocket.x, my-Rocket.y
 +
Rocket.angle = math.atan2 (dy, dx)
 +
Rocket.x = Rocket.x + dt*dx
 +
Rocket.y = Rocket.y + dt*dy
 +
end
 +
function love.draw()
 +
love.graphics.draw (Rocket.image, Rocket.x, Rocket.y, Rocket.angle, 1, 1, Rocket.ox, Rocket.oy)
 +
end
 +
</source>
  
−
The pivotal point is (x, y) on the screen and (ox, oy) in the internal coordinate system of the drawable object, before rotation and scaling. The object is scaled by (sx, sy), then rotated by r around the pivotal point.
 
 
== See Also ==
 
== See Also ==
 +
* [[love.graphics.drawInstanced]]
 +
* [[love.graphics.drawLayer]]
 
* [[parent::love.graphics]]
 
* [[parent::love.graphics]]
 
[[Category:Functions]]
 
[[Category:Functions]]
−
{{#set:Description=Draw objects on screen.}}
+
[[Sub-Category::Drawing| ]]
 +
{{#set:Description=Draws objects on screen.}}
 
{{#set:Since=000}}
 
{{#set:Since=000}}
 +
 
== Other Languages ==
 
== Other Languages ==
 
{{i18n|love.graphics.draw}}
 
{{i18n|love.graphics.draw}}

Latest revision as of 07:40, 7 October 2023

Draws a Drawable object (an Image, Canvas, SpriteBatch, ParticleSystem, Mesh, Text object, or Video) on the screen with optional rotation, scaling and shearing.

Objects are drawn relative to their local coordinate system. The origin is by default located at the top left corner of Image and Canvas objects. All scaling, shearing, and rotation arguments transform the object relative to that point.

It's possible to rotate an object about, for example, its center by offsetting the origin to the center. Angles must be given in radians for rotation. One can also use negative scaling factors to flip the object about its origin.

Note that the offsets are applied before rotation, scaling, or shearing; scaling and shearing are applied before rotation.

The right and bottom edges of the object are shifted at an angle defined by the shearing factors.

When using the default shader anything drawn with this function will be tinted according to the currently selected color. Set it to pure white to preserve the object's original colors.

Function

Synopsis

love.graphics.draw( drawable, x, y, r, sx, sy, ox, oy, kx, ky )

Arguments

Drawable drawable
A drawable object.
number x (0)
The position to draw the object (x-axis).
number y (0)
The position to draw the object (y-axis).
number r (0)
Orientation (radians).
number sx (1)
Scale factor (x-axis).
number sy (sx)
Scale factor (y-axis).
number ox (0)
Origin offset (x-axis).
number oy (0)
Origin offset (y-axis).
Available since LÖVE 0.8.0
number kx (0)
Shearing factor (x-axis).
number ky (0)
Shearing factor (y-axis).

Returns

Nothing.

Function

Available since LÖVE 0.9.0
It has replaced love.graphics.drawq.

Synopsis

love.graphics.draw( texture, quad, x, y, r, sx, sy, ox, oy, kx, ky )

Arguments

Texture texture
A Texture (Image or Canvas) to texture the Quad with.
Quad quad
The Quad to draw on screen.
number x
The position to draw the object (x-axis).
number y
The position to draw the object (y-axis).
number r (0)
Orientation (radians).
number sx (1)
Scale factor (x-axis).
number sy (sx)
Scale factor (y-axis).
number ox (0)
Origin offset (x-axis).
number oy (0)
Origin offset (y-axis).
number kx (0)
Shearing factor (x-axis).
number ky (0)
Shearing factor (y-axis).

Returns

Nothing.

Function

Available since LÖVE 11.0
This variant is not supported in earlier versions.

Synopsis

love.graphics.draw( drawable, transform )

Arguments

Drawable drawable
A drawable object.
Transform transform
Transformation object.

Returns

Nothing.

Function

Available since LÖVE 11.0
This variant is not supported in earlier versions.

Synopsis

love.graphics.draw( texture, quad, transform )

Arguments

Texture texture
A Texture (Image or Canvas) to texture the Quad with.
Quad quad
The Quad to draw on screen.
Transform transform
Transformation object.

Returns

Nothing.

Examples

Draw an image (the Hamster Ball) at 100 by 100 pixels

function love.load()
	hamster = love.graphics.newImage("hamster.png")
end
function love.draw()
	love.graphics.draw(hamster, 100,100)
end

Draw an image (the Hamster Ball) from the center at 100 by 100 pixels, rotating over time

function love.load()
	hamster = love.graphics.newImage("hamster.png")
end
function love.draw()
	local width  = hamster:getWidth()
	local height = hamster:getHeight()
	local angle  = love.timer.getTime() * 2*math.pi / 2.5 -- Rotate one turn per 2.5 seconds.
	love.graphics.draw(hamster, 100,100, angle, 1,1, width/2, height/2)
end
Available since LÖVE 0.9.0
This functionality is not supported in earlier versions.

Draw the top half of an image (the Hamster Ball) at 100 by 100 pixels.

function love.load()
	hamster      = love.graphics.newImage("hamster.png")
	local width  = hamster:getWidth()
	local height = hamster:getHeight()
	quad         = love.graphics.newQuad(0,0, width,height/2, width,height)
end
function love.draw()
	love.graphics.draw(hamster,quad, 100,100)
end


Draw the flying rocket directed to the mouse pointer

function love.load()
	local image = love.graphics.newImage ('rocket.png')
	Rocket ={x=200,y=200,angle=0,image=image,ox=image:getWidth()/2,oy=image:getHeight()/2}
end
function love.update(dt)
	local mx, my = love.mouse.getPosition()
	local dx, dy = mx-Rocket.x, my-Rocket.y
	Rocket.angle = math.atan2 (dy, dx)
	Rocket.x = Rocket.x + dt*dx
	Rocket.y = Rocket.y + dt*dy
end
function love.draw()
	love.graphics.draw (Rocket.image, Rocket.x, Rocket.y, Rocket.angle, 1, 1, Rocket.ox, Rocket.oy)
end

See Also



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