DxDrawMaterialPrimitive: Difference between revisions

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)

@@ Line 36: / Line 36: @@
 Returns a ''true'' if the operation was successful, ''false'' otherwise.
+==Example==
+<syntaxhighlight lang="lua">
 -- Load the texture
 local texture = dxCreateTexture("myTexture.png")
@@ Line 50: / Line 52: @@
 -- Add an event handler to render the primitive every frame
 addEventHandler("onClientRender", root, renderPrimitive)
+</syntaxhighlight>
 ==See Also==