刀光预研

初步实现了刀光交互效果

Content/Lua/HomeLand/UI/Hearth/Widgets/PreCookCenterWidget.lua

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+local DataTableUtils = require("Utils.DataTableUtils")
+local ESlateVisibility = import("ESlateVisibility")
+local SlateBlueprintLibrary = import("SlateBlueprintLibrary")
+local WidgetLayoutLibrary = import("WidgetLayoutLibrary")
+
+
+
+--- @class PreCookCenterWidget
+--- @field ImgContainer table
+--- @field ImgCookMaterial table
+local PreCookCenterWidget = {}
+
+function PreCookCenterWidget:ctor()
+    self.mouse_tracks = {}
+    self.is_pressed = false
+end
+
+
+function PreCookCenterWidget:OnInitialized()
+    self.bHasScriptImplementedTick = true
+
+    self.BtnMain.OnReleased:Add(function()
+        -- self.bHasScriptImplementedTick = false
+        self.is_pressed = false
+        print("release")
+    end)
+    self.BtnMain.OnPressed:Add(function()
+        self.mouse_tracks = {}
+        self.is_pressed = true
+        -- self.bHasScriptImplementedTick = true
+        print("pressed")
+    end)
+    -- self.BtnMain.OnClicked:Add(function()
+    --     print("onclicked")
+    -- end)
+end
+
+function PreCookCenterWidget:Construct()
+    -- self.bHasScriptImplementedTick = true
+end
+
+function PreCookCenterWidget:Destruct()
+
+end
+
+function PreCookCenterWidget:SetEmpty()
+    self.ImgContainer:SetVisibility(ESlateVisibility.Collapsed)
+    self.ImgCookMaterial:SetVisibility(ESlateVisibility.Collapsed)
+end
+
+function PreCookCenterWidget:AddContainer(pre_cook_contianer_id)
+    local row = DataTableUtils.GetDataTableRow("PreCookItemConfig", pre_cook_contianer_id)
+    if not row then return end
+    self.ImgContainer:SetBrushFromSoftTexture(row.CenterDisplayResource, true)
+    self.ImgContainer:SetVisibility(ESlateVisibility.SelfHitTestInvisible)
+end
+
+function PreCookCenterWidget:RemoveContainer()
+    self.ImgContainer:SetVisibility(ESlateVisibility.Collapsed)
+end
+
+function PreCookCenterWidget:AddCookMaterial(pre_cook_material_id)
+    local row = DataTableUtils.GetDataTableRow("PreCookItemConfig", pre_cook_material_id)
+    if not row then return end
+    self.ImgCookMaterial:SetBrushFromSoftTexture(row.CenterDisplayResource, true)
+    self.ImgCookMaterial:SetVisibility(ESlateVisibility.SelfHitTestInvisible)
+end
+
+
+local function UpdateOldMouseTrack(old_mouse_tracks, delta_time)
+    local new_mouse_tracks = {}
+    -- local new_track = {x=fixed_x, y=fixed_y, remain=1.0}
+    for _, track in pairs(old_mouse_tracks) do
+        track.remain = track.remain - delta_time
+        if track.remain > 0 then
+            table.insert(new_mouse_tracks, track)
+        end
+    end
+    return new_mouse_tracks
+end
+
+--- 将鼠标的轨迹坐标规范到以起始点到终点所连直线为x轴的坐标系下
+local function NormalizeTrackParam(mouse_tracks)
+
+end
+
+--- 根据指定点坐标，求解三次样条参数
+local function GetSplineParams(normalize_params)
+
+end
+
+local function UpdateCutMaskByTracks(widget, mouse_tracks)
+    local FVector2D = import("Vector2D")
+    local FWidgetTransform = import("WidgetTransform")
+    if #mouse_tracks < 2 then return end
+
+    local translation, scale = FVector2D(), FVector2D()
+    local render_transform = FWidgetTransform()
+    local first_point, last_point = mouse_tracks[1], mouse_tracks[#mouse_tracks]
+    local delta_x = last_point.X - first_point.X
+    local delta_y = last_point.Y - first_point.Y
+    local mask_length = (delta_x^2 + delta_y^2)^0.5
+
+
+
+    translation.X, translation.Y = first_point.X, first_point.Y
+    scale.X, scale.Y = mask_length / 512, 1
+    render_transform.Scale = scale
+    render_transform.Translation = translation
+    render_transform.Angle = (math.atan(delta_y, delta_x) / (2 * math.pi)) * 360
+    -- render_transform.Scale = FVector2D(mask_length / 512, 1)
+    print(render_transform.Angle, math.atan(delta_y, delta_x))
+
+    widget:SetRenderTransform(render_transform)
+--[[
+
+	/** The amount to translate the widget in slate units */
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category=Transform, meta=( Delta = "1" ))
+	FVector2D Translation;
+
+	/** The scale to apply to the widget */
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category=Transform, meta=( UIMin = "-5", UIMax = "5", Delta = "0.05" ))
+	FVector2D Scale;
+
+	/** The amount to shear the widget in slate units */
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category=Transform, meta=( UIMin = "-89", ClampMin = "-89", UIMax = "89", ClampMax = "89", Delta = "1" ))
+	FVector2D Shear;
+
+	/** The angle in degrees to rotate */
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category=Transform, meta=( UIMin = "-180", UIMax = "180", Delta = "1" ))
+	float Angle;
+
+]]
+
+end
+
+function PreCookCenterWidget:Tick(geometry, delta_time)
+    local size = SlateBlueprintLibrary.GetLocalSize(geometry)
+    local cursor_pos = WidgetLayoutLibrary.GetMousePositionOnViewport(self)
+    local left_top = SlateBlueprintLibrary.GetLocalTopLeft(geometry)
+    local fixed_x = math.min(math.max(cursor_pos.X - left_top.X, 0), size.X)
+    local fixed_y = math.min(math.max(cursor_pos.Y - left_top.Y, 0), size.Y)
+
+    local mouse_tracks = UpdateOldMouseTrack(self.mouse_tracks, delta_time)
+
+    if self.is_pressed then
+        table.insert(mouse_tracks, {X=fixed_x, Y=fixed_y, remain=0.5})
+    end
+
+    -- 计算样条参数
+    local normalize_params = NormalizeTrackParam(mouse_tracks)
+    local A, B, C, D = GetSplineParams(normalize_params)  -- Ax^3 + Bx^2 + Cx + D
+
+    -- 计算划痕位置
+
+    UpdateCutMaskByTracks(self.ImgMask, mouse_tracks)
+
+    self.mouse_tracks = mouse_tracks
+
+
+    -- print(fixed_x, fixed_y, #self.mouse_tracks)
+end
+
+
+
+-- function PreCookCenterWidget:LuaMouseButtonDown()
+--     print("on mouse button down")
+-- end
+
+-- function PreCookCenterWidget:LuaMouseButtonUp()
+--     print("on mouse button up")
+-- end
+
+
+return Class(nil, nil, PreCookCenterWidget)