DxDrawMaterialPrimitive: Difference between revisions

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Returns a ''true'' if the operation was successful, ''false'' otherwise.
Returns a ''true'' if the operation was successful, ''false'' otherwise.


==Example==
==Example==  
{{Example}}
<syntaxhighlight lang="lua">
-- Load the texture
local texture = dxCreateTexture("myTexture.png")
 
-- Function to render a textured triangle
function renderPrimitive()
    if texture then
        -- Draw the primitive using the "trianglelist" type
        -- 3 vertices, each with 4 numbers: {x, y, u, v}
        dxDrawMaterialPrimitive("trianglelist", texture, false, {100, 100, 0, 0}, {300, 100, 1, 0}, {200, 300, 0.5, 1})
    end
end
 
-- Add an event handler to render the primitive every frame
addEventHandler("onClientRender", root, renderPrimitive)
</syntaxhighlight>


==See Also==
==See Also==

Latest revision as of 13:55, 29 August 2024

This function draws a 2D primitive shape with material applied to it across the screen - rendered for one frame. This should be used in conjunction with onClientRender in order to display continuously. If image file is used, it should ideally have dimensions that are a power of two, to prevent possible blurring. Power of two: 2px, 4px, 8px, 16px, 32px, 64px, 128px, 256px, 512px, 1024px...

Syntax

bool dxDrawMaterialPrimitive ( primitiveType pType, mixed material, bool postGUI, table vertex1 [, table vertex2, ...] )

Required Arguments

  • pType: Type of primitive to be drawn.
  • image: Either a material element or a filepath of the image which is going to be drawn. (.dds images are also supported). Image files should ideally have dimensions that are a power of two, to prevent possible blurring. Use a texture created with dxCreateTexture to speed up drawing.
  • postGUI: A bool representing whether the line should be drawn on top of or behind any ingame GUI (rendered by CEGUI).
  • vertices: Tables representing each primitive vertex, required amount of them is determined by primitive type.

Allowed types

Available primitive types.

More info on primitives may be found on this MSDN site

  • pointlist: Renders the vertices as a collection of isolated points.
  • linelist: Renders the vertices as a list of isolated straight line segments.
  • linestrip: Renders the vertices as a single polyline.
  • trianglelist: Renders the specified vertices as a sequence of isolated triangles. Each group of three vertices defines a separate triangle.
  • trianglestrip: Renders the vertices as a triangle strip.
  • trianglefan: Renders the vertices as a triangle fan.

Vertices format

  • posX: An float representing the absolute X position of the vertex, represented by pixels on the screen.
  • posY: An float representing the absolute Y position of the vertex, represented by pixels on the screen.
  • color (optional): An integer of the hex color, produced using tocolor or 0xAARRGGBB (AA = alpha, RR = red, GG = green, BB = blue). If it's not specified, white color is used.
  • u: An float representing the relative X coordinate of the top left corner of the material which should be drawn from image
  • v: An float representing the relative Y coordinate of the top left corner of the material which should be drawn from image

Returns

Returns a true if the operation was successful, false otherwise.

Example

-- Load the texture
local texture = dxCreateTexture("myTexture.png")

-- Function to render a textured triangle
function renderPrimitive()
    if texture then
        -- Draw the primitive using the "trianglelist" type
        -- 3 vertices, each with 4 numbers: {x, y, u, v}
        dxDrawMaterialPrimitive("trianglelist", texture, false, {100, 100, 0, 0}, {300, 100, 1, 0}, {200, 300, 0.5, 1})
    end
end

-- Add an event handler to render the primitive every frame
addEventHandler("onClientRender", root, renderPrimitive)

See Also

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