Fix capture grid calculation

The capture grid calculation takes now the rendering rectangle into consideration.
With this fix the capture grid will include all cells that overlap with the given capture rectangle.

files/capture.lua

@@ -240,7 +240,7 @@ end
 ---Starts the capturing process of the given area using a hilbert curve.
 ---Use `Capture.MapCapturingCtx` to stop, control or view the process.
 ---@param topLeft Vec2 -- Top left of the to be captured rectangle.
----@param bottomRight Vec2 -- Non included bottom left of the to be captured rectangle.
+---@param bottomRight Vec2 -- Non inclusive bottom right coordinate of the to be captured rectangle.
 ---@param captureGridSize number -- The grid size in world pixels.
 ---@param outputPixelScale number? -- The resulting image pixel to world pixel ratio.
 ---@param captureDelay number? -- The number of additional frames to wait before a screen capture.
@@ -250,15 +250,19 @@ function Capture:StartCapturingAreaHilbert(topLeft, bottomRight, captureGridSize
 	local file = io.open("mods/noita-mapcap/output/nonempty", "a")
 	if file ~= nil then file:close() end
 
-	---The rectangle in grid coordinates.
-	---@type Vec2, Vec2
-	local gridTopLeft, gridBottomRight = (topLeft / captureGridSize):Rounded("floor"), (bottomRight / captureGridSize):Rounded("floor")
+	-- The capture offset which is needed to center the grid cells in the viewport.
+	local captureOffset = Vec2(captureGridSize / 2, captureGridSize / 2)
+
+	-- Get the extended capture rectangle that encloses all grid cells that need to be included in the capture.
+	-- In this case we only need to extend the capture area by the valid rendering rectangle.
+	local validTopLeft, validBottomRight = Coords:ValidRenderingRect()
+	local validTopLeftWorld, validBottomRightWorld = Coords:ToWorld(validTopLeft, topLeft + captureOffset), Coords:ToWorld(validBottomRight, bottomRight + captureOffset)
 
-	-- Handle edge cases.
-	if topLeft.x == bottomRight.x then gridBottomRight.x = gridTopLeft.x end
-	if topLeft.y == bottomRight.y then gridBottomRight.y = gridTopLeft.y end
+	---The capture rectangle in grid coordinates.
+	---@type Vec2, Vec2
+	local gridTopLeft, gridBottomRight = (validTopLeftWorld / captureGridSize):Rounded("floor"), ((validBottomRightWorld) / captureGridSize):Rounded("ceil") - Vec2(1, 1)
 
-	---Size of the rectangle in grid coordinates.
+	---Size of the rectangle in grid cells.
 	---@type Vec2
 	local gridSize = gridBottomRight - gridTopLeft
 
@@ -287,7 +291,7 @@ function Capture:StartCapturingAreaHilbert(topLeft, bottomRight, captureGridSize
 				---Position in world coordinates.
 				---@type Vec2
 				local pos = (hilbertPos + gridTopLeft) * captureGridSize
-				pos:Add(Vec2(captureGridSize / 2, captureGridSize / 2)) -- Move to center of grid cell.
+				pos:Add(captureOffset) -- Move to center of grid cell.
 				captureScreenshot(pos, true, true, ctx, outputPixelScale, captureDelay)
 				ctx.state.Current = ctx.state.Current + 1
 			end
@@ -309,7 +313,7 @@ end
 ---Starts the capturing process of the given area by scanning from left to right, and top to bottom.
 ---Use `Capture.MapCapturingCtx` to stop, control or view the process.
 ---@param topLeft Vec2 -- Top left of the to be captured rectangle.
----@param bottomRight Vec2 -- Non included bottom left of the to be captured rectangle.
+---@param bottomRight Vec2 -- Non inclusive bottom right coordinate of the to be captured rectangle.
 ---@param captureGridSize number -- The grid size in world pixels.
 ---@param outputPixelScale number? -- The resulting image pixel to world pixel ratio.
 ---@param captureDelay number? -- The number of additional frames to wait before a screen capture.
@@ -319,11 +323,19 @@ function Capture:StartCapturingAreaScan(topLeft, bottomRight, captureGridSize, o
 	local file = io.open("mods/noita-mapcap/output/nonempty", "a")
 	if file ~= nil then file:close() end
 
-	---The rectangle in grid coordinates.
+	-- The capture offset which is needed to center the grid cells in the viewport.
+	local captureOffset = Vec2(captureGridSize / 2, captureGridSize / 2)
+
+	-- Get the extended capture rectangle that encloses all grid cells that need to be included in the capture.
+	-- In this case we only need to extend the capture area by the valid rendering rectangle.
+	local validTopLeft, validBottomRight = Coords:ValidRenderingRect()
+	local validTopLeftWorld, validBottomRightWorld = Coords:ToWorld(validTopLeft, topLeft + captureOffset), Coords:ToWorld(validBottomRight, bottomRight + captureOffset)
+
+	---The capture rectangle in grid coordinates.
 	---@type Vec2, Vec2
-	local gridTopLeft, gridBottomRight = (topLeft / captureGridSize):Rounded("floor"), (bottomRight / captureGridSize):Rounded("floor")
+	local gridTopLeft, gridBottomRight = (validTopLeftWorld / captureGridSize):Rounded("floor"), ((validBottomRightWorld) / captureGridSize):Rounded("ceil") - Vec2(1, 1)
 
-	---Size of the rectangle in grid coordinates.
+	---Size of the rectangle in grid cells.
 	---@type Vec2
 	local gridSize = gridBottomRight - gridTopLeft
 
@@ -345,7 +357,7 @@ function Capture:StartCapturingAreaScan(topLeft, bottomRight, captureGridSize, o
 				---Position in world coordinates.
 				---@type Vec2
 				local pos = gridPos * captureGridSize
-				pos:Add(Vec2(captureGridSize / 2, captureGridSize / 2)) -- Move to center of grid cell.
+				pos:Add(captureOffset) -- Move to center of grid cell.
 				captureScreenshot(pos, true, true, ctx, outputPixelScale, captureDelay)
 				ctx.state.Current = ctx.state.Current + 1
 			end