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Diffstat (limited to 'doc/classes/CanvasItem.xml')
| -rw-r--r-- | doc/classes/CanvasItem.xml | 60 |
1 files changed, 31 insertions, 29 deletions
diff --git a/doc/classes/CanvasItem.xml b/doc/classes/CanvasItem.xml index 391ff1efb1..fe1fe498d1 100644 --- a/doc/classes/CanvasItem.xml +++ b/doc/classes/CanvasItem.xml @@ -5,7 +5,7 @@ </brief_description> <description> Base class of anything 2D. Canvas items are laid out in a tree; children inherit and extend their parent's transform. [CanvasItem] is extended by [Control] for anything GUI-related, and by [Node2D] for anything related to the 2D engine. - Any [CanvasItem] can draw. For this, [method update] must be called, then [constant NOTIFICATION_DRAW] will be received on idle time to request redraw. Because of this, canvas items don't need to be redrawn on every frame, improving the performance significantly. Several functions for drawing on the [CanvasItem] are provided (see [code]draw_*[/code] functions). However, they can only be used inside the [method Object._notification], signal or [method _draw] virtual functions. + Any [CanvasItem] can draw. For this, [method update] is called by the engine, then [constant NOTIFICATION_DRAW] will be received on idle time to request redraw. Because of this, canvas items don't need to be redrawn on every frame, improving the performance significantly. Several functions for drawing on the [CanvasItem] are provided (see [code]draw_*[/code] functions). However, they can only be used inside [method _draw], its corresponding [method Object._notification] or methods connected to the [signal draw] signal. Canvas items are drawn in tree order. By default, children are on top of their parents so a root [CanvasItem] will be drawn behind everything. This behavior can be changed on a per-item basis. A [CanvasItem] can also be hidden, which will also hide its children. It provides many ways to change parameters such as modulation (for itself and its children) and self modulation (only for itself), as well as its blend mode. Ultimately, a transform notification can be requested, which will notify the node that its global position changed in case the parent tree changed. @@ -20,7 +20,8 @@ <method name="_draw" qualifiers="virtual"> <return type="void" /> <description> - Overridable function called by the engine (if defined) to draw the canvas item. + Called when [CanvasItem] has been requested to redraw (when [method update] is called, either manually or by the engine). + Corresponds to the [constant NOTIFICATION_DRAW] notification in [method Object._notification]. </description> </method> <method name="draw_animation_slice"> @@ -44,7 +45,7 @@ <param index="6" name="width" type="float" default="1.0" /> <param index="7" name="antialiased" type="bool" default="false" /> <description> - Draws a unfilled arc between the given angles. The larger the value of [code]point_count[/code], the smoother the curve. See also [method draw_circle]. + Draws a unfilled arc between the given angles. The larger the value of [param point_count], the smoother the curve. See also [method draw_circle]. </description> </method> <method name="draw_char" qualifiers="const"> @@ -86,7 +87,7 @@ <param index="2" name="uvs" type="PackedVector2Array" default="PackedVector2Array()" /> <param index="3" name="texture" type="Texture2D" default="null" /> <description> - Draws a colored polygon of any amount of points, convex or concave. Unlike [method draw_polygon], a single color must be specified for the whole polygon. + Draws a colored polygon of any number of points, convex or concave. Unlike [method draw_polygon], a single color must be specified for the whole polygon. </description> </method> <method name="draw_dashed_line"> @@ -137,8 +138,8 @@ <param index="5" name="pixel_range" type="float" default="4.0" /> <description> Draws a textured rectangle region of the multi-channel signed distance field texture at a given position, optionally modulated by a color. See [member FontFile.multichannel_signed_distance_field] for more information and caveats about MSDF font rendering. - If [code]outline[/code] is positive, each alpha channel value of pixel in region is set to maximum value of true distance in the [code]outline[/code] radius. - Value of the [code]pixel_range[/code] should the same that was used during distance field texture generation. + If [param outline] is positive, each alpha channel value of pixel in region is set to maximum value of true distance in the [param outline] radius. + Value of the [param pixel_range] should the same that was used during distance field texture generation. </description> </method> <method name="draw_multiline"> @@ -147,7 +148,7 @@ <param index="1" name="color" type="Color" /> <param index="2" name="width" type="float" default="1.0" /> <description> - Draws multiple disconnected lines with a uniform [code]color[/code]. When drawing large amounts of lines, this is faster than using individual [method draw_line] calls. To draw interconnected lines, use [method draw_polyline] instead. + Draws multiple disconnected lines with a uniform [param color]. When drawing large amounts of lines, this is faster than using individual [method draw_line] calls. To draw interconnected lines, use [method draw_polyline] instead. </description> </method> <method name="draw_multiline_colors"> @@ -156,7 +157,7 @@ <param index="1" name="colors" type="PackedColorArray" /> <param index="2" name="width" type="float" default="1.0" /> <description> - Draws multiple disconnected lines with a uniform [code]width[/code] and segment-by-segment coloring. Colors assigned to line segments match by index between [code]points[/code] and [code]colors[/code]. When drawing large amounts of lines, this is faster than using individual [method draw_line] calls. To draw interconnected lines, use [method draw_polyline_colors] instead. + Draws multiple disconnected lines with a uniform [param width] and segment-by-segment coloring. Colors assigned to line segments match by index between [param points] and [param colors]. When drawing large amounts of lines, this is faster than using individual [method draw_line] calls. To draw interconnected lines, use [method draw_polyline_colors] instead. </description> </method> <method name="draw_multiline_string" qualifiers="const"> @@ -174,7 +175,7 @@ <param index="10" name="direction" type="int" enum="TextServer.Direction" default="0" /> <param index="11" name="orientation" type="int" enum="TextServer.Orientation" default="0" /> <description> - Breaks [code]text[/code] to the lines and draws it using the specified [code]font[/code] at the [code]position[/code] (top-left corner). The text will have its color multiplied by [code]modulate[/code]. If [code]clip_w[/code] is greater than or equal to 0, the text will be clipped if it exceeds the specified width. + Breaks [param text] into lines and draws it using the specified [param font] at the [param pos] (top-left corner). The text will have its color multiplied by [param modulate]. If [param width] is greater than or equal to 0, the text will be clipped if it exceeds the specified width. </description> </method> <method name="draw_multiline_string_outline" qualifiers="const"> @@ -193,7 +194,7 @@ <param index="11" name="direction" type="int" enum="TextServer.Direction" default="0" /> <param index="12" name="orientation" type="int" enum="TextServer.Orientation" default="0" /> <description> - Breaks [code]text[/code] to the lines and draws text outline using the specified [code]font[/code] at the [code]position[/code] (top-left corner). The text will have its color multiplied by [code]modulate[/code]. If [code]clip_w[/code] is greater than or equal to 0, the text will be clipped if it exceeds the specified width. + Breaks [param text] to the lines and draws text outline using the specified [param font] at the [param pos] (top-left corner). The text will have its color multiplied by [param modulate]. If [param width] is greater than or equal to 0, the text will be clipped if it exceeds the specified width. </description> </method> <method name="draw_multimesh"> @@ -211,7 +212,7 @@ <param index="2" name="uvs" type="PackedVector2Array" default="PackedVector2Array()" /> <param index="3" name="texture" type="Texture2D" default="null" /> <description> - Draws a solid polygon of any amount of points, convex or concave. Unlike [method draw_colored_polygon], each point's color can be changed individually. See also [method draw_polyline] and [method draw_polyline_colors]. + Draws a solid polygon of any number of points, convex or concave. Unlike [method draw_colored_polygon], each point's color can be changed individually. See also [method draw_polyline] and [method draw_polyline_colors]. </description> </method> <method name="draw_polyline"> @@ -221,7 +222,7 @@ <param index="2" name="width" type="float" default="1.0" /> <param index="3" name="antialiased" type="bool" default="false" /> <description> - Draws interconnected line segments with a uniform [code]color[/code] and [code]width[/code] and optional antialiasing. When drawing large amounts of lines, this is faster than using individual [method draw_line] calls. To draw disconnected lines, use [method draw_multiline] instead. See also [method draw_polygon]. + Draws interconnected line segments with a uniform [param color] and [param width] and optional antialiasing. When drawing large amounts of lines, this is faster than using individual [method draw_line] calls. To draw disconnected lines, use [method draw_multiline] instead. See also [method draw_polygon]. </description> </method> <method name="draw_polyline_colors"> @@ -231,7 +232,7 @@ <param index="2" name="width" type="float" default="1.0" /> <param index="3" name="antialiased" type="bool" default="false" /> <description> - Draws interconnected line segments with a uniform [code]width[/code] and segment-by-segment coloring, and optional antialiasing. Colors assigned to line segments match by index between [code]points[/code] and [code]colors[/code]. When drawing large amounts of lines, this is faster than using individual [method draw_line] calls. To draw disconnected lines, use [method draw_multiline_colors] instead. See also [method draw_polygon]. + Draws interconnected line segments with a uniform [param width] and segment-by-segment coloring, and optional antialiasing. Colors assigned to line segments match by index between [param points] and [param colors]. When drawing large amounts of lines, this is faster than using individual [method draw_line] calls. To draw disconnected lines, use [method draw_multiline_colors] instead. See also [method draw_polygon]. </description> </method> <method name="draw_primitive"> @@ -252,8 +253,8 @@ <param index="2" name="filled" type="bool" default="true" /> <param index="3" name="width" type="float" default="1.0" /> <description> - Draws a rectangle. If [code]filled[/code] is [code]true[/code], the rectangle will be filled with the [code]color[/code] specified. If [code]filled[/code] is [code]false[/code], the rectangle will be drawn as a stroke with the [code]color[/code] and [code]width[/code] specified. - [b]Note:[/b] [code]width[/code] is only effective if [code]filled[/code] is [code]false[/code]. + Draws a rectangle. If [param filled] is [code]true[/code], the rectangle will be filled with the [param color] specified. If [param filled] is [code]false[/code], the rectangle will be drawn as a stroke with the [param color] and [param width] specified. + [b]Note:[/b] [param width] is only effective if [param filled] is [code]false[/code]. </description> </method> <method name="draw_set_transform"> @@ -285,7 +286,7 @@ <param index="8" name="direction" type="int" enum="TextServer.Direction" default="0" /> <param index="9" name="orientation" type="int" enum="TextServer.Orientation" default="0" /> <description> - Draws [code]text[/code] using the specified [code]font[/code] at the [code]position[/code] (bottom-left corner using the baseline of the font). The text will have its color multiplied by [code]modulate[/code]. If [code]clip_w[/code] is greater than or equal to 0, the text will be clipped if it exceeds the specified width. + Draws [param text] using the specified [param font] at the [param pos] (bottom-left corner using the baseline of the font). The text will have its color multiplied by [param modulate]. If [param width] is greater than or equal to 0, the text will be clipped if it exceeds the specified width. [b]Example using the default project font:[/b] [codeblocks] [gdscript] @@ -322,7 +323,7 @@ <param index="9" name="direction" type="int" enum="TextServer.Direction" default="0" /> <param index="10" name="orientation" type="int" enum="TextServer.Orientation" default="0" /> <description> - Draws [code]text[/code] outline using the specified [code]font[/code] at the [code]position[/code] (bottom-left corner using the baseline of the font). The text will have its color multiplied by [code]modulate[/code]. If [code]clip_w[/code] is greater than or equal to 0, the text will be clipped if it exceeds the specified width. + Draws [param text] outline using the specified [param font] at the [param pos] (bottom-left corner using the baseline of the font). The text will have its color multiplied by [param modulate]. If [param width] is greater than or equal to 0, the text will be clipped if it exceeds the specified width. </description> </method> <method name="draw_style_box"> @@ -350,7 +351,7 @@ <param index="3" name="modulate" type="Color" default="Color(1, 1, 1, 1)" /> <param index="4" name="transpose" type="bool" default="false" /> <description> - Draws a textured rectangle at a given position, optionally modulated by a color. If [code]transpose[/code] is [code]true[/code], the texture will have its X and Y coordinates swapped. + Draws a textured rectangle at a given position, optionally modulated by a color. If [param transpose] is [code]true[/code], the texture will have its X and Y coordinates swapped. </description> </method> <method name="draw_texture_rect_region"> @@ -362,7 +363,7 @@ <param index="4" name="transpose" type="bool" default="false" /> <param index="5" name="clip_uv" type="bool" default="true" /> <description> - Draws a textured rectangle region at a given position, optionally modulated by a color. If [code]transpose[/code] is [code]true[/code], the texture will have its X and Y coordinates swapped. + Draws a textured rectangle region at a given position, optionally modulated by a color. If [param transpose] is [code]true[/code], the texture will have its X and Y coordinates swapped. </description> </method> <method name="force_update_transform"> @@ -465,35 +466,35 @@ <method name="is_visible_in_tree" qualifiers="const"> <return type="bool" /> <description> - Returns [code]true[/code] if the node is present in the [SceneTree], its [member visible] property is [code]true[/code] and all its antecedents are also visible. If any antecedent is hidden, this node will not be visible in the scene tree. + Returns [code]true[/code] if the node is present in the [SceneTree], its [member visible] property is [code]true[/code] and all its antecedents are also visible. If any antecedent is hidden, this node will not be visible in the scene tree, and is consequently not drawn (see [method _draw]). </description> </method> <method name="make_canvas_position_local" qualifiers="const"> <return type="Vector2" /> <param index="0" name="screen_point" type="Vector2" /> <description> - Assigns [code]screen_point[/code] as this node's new local transform. + Assigns [param screen_point] as this node's new local transform. </description> </method> <method name="make_input_local" qualifiers="const"> <return type="InputEvent" /> <param index="0" name="event" type="InputEvent" /> <description> - Transformations issued by [code]event[/code]'s inputs are applied in local space instead of global space. + Transformations issued by [param event]'s inputs are applied in local space instead of global space. </description> </method> <method name="set_notify_local_transform"> <return type="void" /> <param index="0" name="enable" type="bool" /> <description> - If [code]enable[/code] is [code]true[/code], this node will receive [constant NOTIFICATION_LOCAL_TRANSFORM_CHANGED] when its local transform changes. + If [param enable] is [code]true[/code], this node will receive [constant NOTIFICATION_LOCAL_TRANSFORM_CHANGED] when its local transform changes. </description> </method> <method name="set_notify_transform"> <return type="void" /> <param index="0" name="enable" type="bool" /> <description> - If [code]enable[/code] is [code]true[/code], this node will receive [constant NOTIFICATION_TRANSFORM_CHANGED] when its global transform changes. + If [param enable] is [code]true[/code], this node will receive [constant NOTIFICATION_TRANSFORM_CHANGED] when its global transform changes. </description> </method> <method name="show"> @@ -505,7 +506,7 @@ <method name="update"> <return type="void" /> <description> - Queue the [CanvasItem] for update. [constant NOTIFICATION_DRAW] will be called on idle time to request redraw. + Queues the [CanvasItem] to redraw. During idle time, if [CanvasItem] is visible, [constant NOTIFICATION_DRAW] is sent and [method _draw] is called. This only occurs [b]once[/b] per frame, even if this method has been called multiple times. </description> </method> </methods> @@ -547,7 +548,8 @@ <signals> <signal name="draw"> <description> - Emitted when the [CanvasItem] must redraw. This can only be connected realtime, as deferred will not allow drawing. + Emitted when the [CanvasItem] must redraw, [i]after[/i] the related [constant NOTIFICATION_DRAW] notification, and [i]before[/i] [method _draw] is called. + [b]Note:[/b] Deferred connections do not allow drawing through the [code]draw_*[/code] methods. </description> </signal> <signal name="hidden"> @@ -574,7 +576,7 @@ The [CanvasItem]'s local transform has changed. This notification is only received if enabled by [method set_notify_local_transform]. </constant> <constant name="NOTIFICATION_DRAW" value="30"> - The [CanvasItem] is requested to draw. + The [CanvasItem] is requested to draw (see [method _draw]). </constant> <constant name="NOTIFICATION_VISIBILITY_CHANGED" value="31"> The [CanvasItem]'s visibility has changed. @@ -601,11 +603,11 @@ The texture filter blends between the nearest 4 pixels and between the nearest 2 mipmaps. Use this for non-pixel art textures that may be viewed at a low scale (e.g. due to [Camera2D] zoom), as mipmaps are important to smooth out pixels that are smaller than on-screen pixels. </constant> <constant name="TEXTURE_FILTER_NEAREST_WITH_MIPMAPS_ANISOTROPIC" value="5" enum="TextureFilter"> - The texture filter reads from the nearest pixel, but selects a mipmap based on the angle between the surface and the camera view. This reduces artifacts on surfaces that are almost in line with the camera. + The texture filter reads from the nearest pixel, but selects a mipmap based on the angle between the surface and the camera view. This reduces artifacts on surfaces that are almost in line with the camera. The anisotropic filtering level can be changed by adjusting [member ProjectSettings.rendering/textures/default_filters/anisotropic_filtering_level]. [b]Note:[/b] This texture filter is rarely useful in 2D projects. [constant TEXTURE_FILTER_NEAREST_WITH_MIPMAPS] is usually more appropriate. </constant> <constant name="TEXTURE_FILTER_LINEAR_WITH_MIPMAPS_ANISOTROPIC" value="6" enum="TextureFilter"> - The texture filter blends between the nearest 4 pixels and selects a mipmap based on the angle between the surface and the camera view. This reduces artifacts on surfaces that are almost in line with the camera. This is the slowest of the filtering options, but results in the highest quality texturing. + The texture filter blends between the nearest 4 pixels and selects a mipmap based on the angle between the surface and the camera view. This reduces artifacts on surfaces that are almost in line with the camera. This is the slowest of the filtering options, but results in the highest quality texturing. The anisotropic filtering level can be changed by adjusting [member ProjectSettings.rendering/textures/default_filters/anisotropic_filtering_level]. [b]Note:[/b] This texture filter is rarely useful in 2D projects. [constant TEXTURE_FILTER_LINEAR_WITH_MIPMAPS] is usually more appropriate. </constant> <constant name="TEXTURE_FILTER_MAX" value="7" enum="TextureFilter"> |