Merge pull request #69 from guzba/master

0.0.16 quadraticCurveTo, path.transform, remove masks.nim for now (unused), better error msg

pixie.nimble

@@ -1,4 +1,4 @@
-version     = "0.0.15"
+version     = "0.0.16"
 author      = "Andre von Houck and Ryan Oldenburg"
 description = "Full-featured 2d graphics library for Nim."
 license     = "MIT"

src/pixie.nim

@@ -1,25 +1,13 @@
-import pixie/images, pixie/masks, pixie/paths, pixie/common, pixie/blends,
+import pixie/images, pixie/paths, pixie/common, pixie/blends,
   pixie/fileformats/bmp, pixie/fileformats/png, pixie/fileformats/jpg,
   pixie/fileformats/svg, flatty/binny, os
 
-export images, masks, paths, common, blends
+export images, paths, common, blends
 
 type
   FileFormat* = enum
     ffPng, ffBmp, ffJpg
 
-proc toMask*(image: Image): Mask =
-  ## Converts an Image to a Mask.
-  result = newMask(image.width, image.height)
-  for i in 0 ..< image.data.len:
-    result.data[i] = image.data[i].a
-
-proc toImage*(mask: Mask): Image =
-  ## Converts a Mask to Image.
-  result = newImage(mask.width, mask.height)
-  for i in 0 ..< mask.data.len:
-    result.data[i].a = mask.data[i]
-
 proc decodeImage*(data: string | seq[uint8]): Image =
   ## Loads an image from a memory.
   if data.len > 8 and data.readUint64(0) == cast[uint64](pngSignature):

src/pixie/images.nim

@@ -121,9 +121,15 @@ proc subImage*(image: Image, x, y, w, h: int): Image =
   ## Gets a sub image from this image.
 
   if x < 0 or x + w > image.width:
-    raise newException(PixieError, "Param x value " & $x & " is out of bounds")
+    raise newException(
+      PixieError,
+      "Params x: " & $x & " w: " & $w & " invalid, image width is " & $image.width
+    )
   if y < 0 or y + h > image.height:
-    raise newException(PixieError, "Param y value " & $y & " is out of bounds")
+    raise newException(
+      PixieError,
+      "Params y: " & $y & " h: " & $h & " invalid, image height is " & $image.height
+    )
 
   result = newImage(w, h)
   for y2 in 0 ..< h:

src/pixie/masks.nim

@@ -1,60 +0,0 @@
-import system/memory
-
-type
-  Mask* = ref object
-    ## Main mask object that holds the mask data.
-    width*, height*: int
-    data*: seq[uint8]
-
-proc newMask*(width, height: int): Mask =
-  ## Creates a new mask with appropriate dimensions.
-  result = Mask()
-  result.width = width
-  result.height = height
-  result.data = newSeq[uint8](width * height)
-
-proc inside*(mask: Mask, x, y: int): bool {.inline.} =
-  ## Returns true if (x, y) is inside the mask.
-  x >= 0 and x < mask.width and y >= 0 and y < mask.height
-
-proc copy*(mask: Mask): Mask =
-  ## Copies an mask creating a new mask.
-  result = newMask(mask.width, mask.height)
-  result.data = mask.data
-
-proc `$`*(mask: Mask): string =
-  ## Display the mask size and channels.
-  "<Mask " & $mask.width & "x" & $mask.height & ">"
-
-proc getUnsafe*(mask: Mask, x, y: int): uint8 {.inline.} =
-  ## Gets a value from (x, y) coordinates.
-  ## * No bounds checking *
-  ## Make sure that x, y are in bounds.
-  ## Failure in the assumptions will case unsafe memory reads.
-  result = mask.data[mask.width * y + x]
-
-proc `[]`*(mask: Mask, x, y: int): uint8 {.inline.} =
-  ## Gets the value at (x, y) or returns transparent black if outside of bounds.
-  if mask.inside(x, y):
-    return mask.getUnsafe(x, y)
-
-proc setUnsafe*(mask: Mask, x, y: int, value: uint8) {.inline.} =
-  ## Sets the value from (x, y) coordinates.
-  ## * No bounds checking *
-  ## Make sure that x, y are in bounds.
-  ## Failure in the assumptions will case unsafe memory writes.
-  mask.data[mask.width * y + x] = value
-
-proc `[]=`*(mask: Mask, x, y: int, value: uint8) {.inline.} =
-  ## Sets the value at (x, y) or does nothing if outside of bounds.
-  if mask.inside(x, y):
-    mask.setUnsafe(x, y, value)
-
-proc fill*(mask: Mask, value: uint8) =
-  ## Fills the mask with the parameter value.
-  nimSetMem(mask.data[0].addr, value.cint, mask.data.len)
-
-proc invert*(mask: Mask) =
-  ## Inverts the entire mask value.
-  for value in mask.data.mitems:
-    value = 255 - value

src/pixie/paths.nim

@@ -188,6 +188,60 @@ proc `$`*(path: Path): string =
       if i != path.commands.len - 1 or j != command.numbers.len - 1:
         result.add " "
 
+proc transform*(path: Path, mat: Mat3) =
+  for command in path.commands.mitems:
+    case command.kind:
+    of Close:
+      discard
+    of Move, Line, RMove, RLine, TQuad, RTQuad:
+      var pos = vec2(command.numbers[0], command.numbers[1])
+      pos = mat * pos
+      command.numbers[0] = pos.x
+      command.numbers[1] = pos.y
+    of HLine, RHLine:
+      var pos = vec2(command.numbers[0], 0)
+      pos = mat * pos
+      command.numbers[0] = pos.x
+    of VLine, RVLine:
+      var pos = vec2(0, command.numbers[0])
+      pos = mat * pos
+      command.numbers[0] = pos.y
+    of Cubic, RCubic:
+      var
+        ctrl1 = vec2(command.numbers[0], command.numbers[1])
+        ctrl2 = vec2(command.numbers[2], command.numbers[3])
+        to = vec2(command.numbers[4], command.numbers[5])
+      ctrl1 = mat * ctrl1
+      ctrl2 = mat * ctrl2
+      to = mat * to
+      command.numbers[0] = ctrl1.x
+      command.numbers[1] = ctrl1.y
+      command.numbers[2] = ctrl2.x
+      command.numbers[3] = ctrl2.y
+      command.numbers[4] = to.x
+      command.numbers[5] = to.y
+    of SCubic, RSCubic, Quad, RQuad:
+      var
+        ctrl = vec2(command.numbers[0], command.numbers[1])
+        to = vec2(command.numbers[2], command.numbers[3])
+      ctrl = mat * ctrl
+      to = mat * to
+      command.numbers[0] = ctrl.x
+      command.numbers[1] = ctrl.y
+      command.numbers[2] = to.x
+      command.numbers[3] = to.y
+    of Arc, RArc:
+      var
+        radii = vec2(command.numbers[0], command.numbers[1])
+        to = vec2(command.numbers[5], command.numbers[6])
+      # Extract the scale from the matrix and only apply that to the radii
+      radii = scale(vec2(mat[0, 0], mat[1, 1])) * radii
+      to = mat * to
+      command.numbers[0] = radii.x
+      command.numbers[1] = radii.y
+      command.numbers[5] = to.x
+      command.numbers[6] = to.y
+
 proc commandsToPolygons*(commands: seq[PathCommand]): seq[seq[Vec2]] =
   ## Converts SVG-like commands to simpler polygon
 
@@ -855,9 +909,19 @@ proc bezierCurveTo*(path: Path, x1, y1, x2, y2, x3, y3: float32) =
     x1, y1, x2, y2, x3, y3
   ]))
 
-proc quadraticCurveTo*(path: Path) =
-  ## Adds a quadratic Bézier curve to the current path.
-  raise newException(ValueError, "not implemented")
+proc quadraticCurveTo*(path: var Path, x1, y1, x2, y2: float32) =
+  ## Adds a quadratic Bézier curve to the path. This requires 2 points.
+  ## The first point is the control point and the second is the end point.
+  ## The starting point is the last point in the current path, which can be
+  ## changed using moveTo() before creating the curve.
+  path.commands.add(PathCommand(
+    kind: Quad,
+    numbers: @[x1, y1, x2, y2]
+  ))
+  path.at = vec2(x2, y2)
+
+proc quadraticCurveTo*(path: var Path, ctrl, to: Vec2) {.inline.} =
+  path.quadraticCurveTo(ctrl.x, ctrl.y, to.x, to.y)
 
 proc arc*(path: Path) =
   ## Adds an arc to the path which is centered at (x, y) position with radius r starting at startAngle and ending at endAngle going in the given direction by anticlockwise (defaulting to clockwise).