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version 0.8.8
This commit is contained in:
Andreas Rumpf
@@ -11,9 +11,9 @@
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## implementation uses SDL but the interface is meant to support multiple
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## backends some day.
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import colors
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import colors, math
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from sdl import PSurface # Bug
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from sdl_ttf import OpenFont
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from sdl_ttf import OpenFont, closeFont
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type
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TRect* = tuple[x, y, width, height: int]
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@@ -24,7 +24,22 @@ type
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w, h: int
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s: sdl.PSurface
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ESDLError = object of EBase
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EGraphics* = object of EBase
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TFont {.pure, final.} = object
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f: sdl_ttf.PFont
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color: SDL.TColor
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PFont* = ref TFont ## represents a font
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proc toSdlColor(c: TColor): Sdl.TColor =
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# Convert colors.TColor to SDL.TColor
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var x = c.extractRGB
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result.r = toU8(x.r)
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result.g = toU8(x.g)
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result.b = toU8(x.b)
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proc raiseEGraphics =
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raise newException(EGraphics, $SDL.GetError())
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proc surfaceFinalizer(s: PSurface) = sdl.freeSurface(s.s)
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@@ -38,6 +53,24 @@ proc newSurface*(width, height: int): PSurface =
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assert(not sdl.MustLock(result.s))
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proc fontFinalizer(f: PFont) = closeFont(f.f)
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proc newFont*(name = "VeraMono.ttf", size = 9, color = colBlack): PFont =
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## Creates a new font object. Raises ``EIO`` if the font cannot be loaded.
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new(result, fontFinalizer)
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result.f = OpenFont(name, size)
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if result.f == nil:
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raise newException(EIO, "Could not open font file: " & name)
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result.color = toSdlColor(color)
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var
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defaultFont*: PFont ## default font that is used; this needs to initialized
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## by the client!
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proc initDefaultFont*(name = "VeraMono.ttf", size = 9, color = colBlack) =
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## initializes the `defaultFont` var.
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defaultFont = newFont(name, size, color)
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proc newScreenSurface(width, height: int): PSurface =
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## Creates a new screen surface
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new(result, surfaceFinalizer)
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@@ -45,12 +78,6 @@ proc newScreenSurface(width, height: int): PSurface =
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result.h = height
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result.s = SDL.SetVideoMode(width, height, 0, 0)
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template withEvents(surf: PSurface, event: expr, actions: stmt): stmt =
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while True:
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var event: SDL.TEvent
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if SDL.PollEvent(addr(event)) == 1:
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actions
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proc writeToBMP*(sur: PSurface, filename: string) =
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## Saves the contents of the surface `sur` to the file `filename` as a
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## BMP file.
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@@ -70,28 +97,37 @@ template getPix(video, pitch, x, y: expr): expr =
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const
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ColSize = 4
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proc getPixel(sur: PSurface, x, y: Natural): colors.TColor =
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proc getPixel(sur: PSurface, x, y: Natural): colors.TColor {.inline.} =
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assert x <% sur.w
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assert y <% sur.h
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result = getPix(cast[PPixels](sur.s.pixels), sur.s.pitch div ColSize, x, y)
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proc setPixel(sur: PSurface, x, y: Natural, col: colors.TColor) =
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proc setPixel(sur: PSurface, x, y: Natural, col: colors.TColor) {.inline.} =
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assert x <% sur.w
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assert y <% sur.h
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var pixs = cast[PPixels](sur.s.pixels)
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#pixs[y * (sur.s.pitch div colSize) + x] = int(col)
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setPix(pixs, sur.s.pitch div ColSize, x, y, col)
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proc `[]`*(sur: PSurface, p: TPoint): TColor =
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## get pixel at position `p`. No range checking is done!
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result = getPixel(sur, p.x, p.y)
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#proc `[,]`*(sur: PSurface, x, y: int): TColor =
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# result = setPixel(sur, x, y)
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proc `[,]`*(sur: PSurface, x, y: int): TColor =
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## get pixel at position ``(x, y)``. No range checking is done!
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result = getPixel(sur, x, y)
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proc `[]=`*(sur: PSurface, p: TPoint, col: TColor) =
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## set the pixel at position `p`. No range checking is done!
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setPixel(sur, p.x, p.y, col)
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#proc `[,]=`*(sur: PSurface, x, y: int, col: TColor) =
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# setPixel(sur, x, y, col)
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proc `[,]=`*(sur: PSurface, x, y: int, col: TColor) =
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## set the pixel at position ``(x, y)``. No range checking is done!
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setPixel(sur, x, y, col)
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proc blitSurface*(destSurf: PSurface, destRect: TRect, srcSurf: PSurface, srcRect: TRect) =
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## Merges ``srcSurf`` into ``destSurf``
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proc blit*(destSurf: PSurface, destRect: TRect, srcSurf: PSurface,
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srcRect: TRect) =
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## Copies ``srcSurf`` into ``destSurf``
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var destTRect, srcTRect: SDL.TRect
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destTRect.x = int16(destRect.x)
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@@ -105,75 +141,39 @@ proc blitSurface*(destSurf: PSurface, destRect: TRect, srcSurf: PSurface, srcRec
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srcTRect.h = int16(srcRect.height)
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if SDL.blitSurface(srcSurf.s, addr(srcTRect), destSurf.s, addr(destTRect)) != 0:
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raise newException(ESDLError, $SDL.GetError())
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raiseEGraphics()
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proc textBounds*(font: string, fontSize: int, text: string): tuple[width, height: int] =
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var fontFile = OpenFont(font, fontSize) # Open the font file
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if fontFile == nil: raise newException(ESDLError, "Could not open font file")
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proc textBounds*(text: string, font = defaultFont): tuple[width, height: int] =
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var w, h: cint
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if sdl_ttf.SizeUTF8(fontFile, text, w, h) < 0:
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raise newException(ESDLError, $SDL.GetError())
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return (int(w), int(h))
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if sdl_ttf.SizeUTF8(font.f, text, w, h) < 0: raiseEGraphics()
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result.width = int(w)
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result.height = int(h)
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proc drawText*(sur: PSurface, p: TPoint, font: string, text: string,
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fg: TColor = colBlack, fontSize: int = 9) =
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## Draws text with a transparent background, at location ``p``.
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## ``font`` specifies the path to the ttf file,
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## ``fontSize`` specifies the font size in pt, and ``fg``
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## specifies the foreground color.
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var fontFile = OpenFont(font, fontSize) # Open the font file
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if fontFile == nil: raise newException(ESDLError, "Could not open font file")
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proc drawText*(sur: PSurface, p: TPoint, text: string, font = defaultFont) =
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## Draws text with a transparent background, at location ``p`` with the given
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## font.
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var textSur: PSurface # This surface will have the text drawn on it
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new(textSur, surfaceFinalizer)
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var RGBfg = fg.extractRGB
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# Convert colors.TColor to SDL.TColor
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var SDLfg: SDL.TColor
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SDLfg.r = toU8(RGBfg.r)
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SDLfg.g = toU8(RGBfg.g)
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SDLfg.b = toU8(RGBfg.b)
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# Render the text
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textSur.s = sdl_ttf.RenderTextBlended(fontFile, text, SDLfg)
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textSur.s = sdl_ttf.RenderTextBlended(font.f, text, font.color)
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# Merge the text surface with sur
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sur.blitSurface((p.x, p.y, sur.w, sur.h), textSur, (0, 0, sur.w, sur.h))
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sur.blit((p.x, p.y, sur.w, sur.h), textSur, (0, 0, sur.w, sur.h))
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# Free the surface
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SDL.FreeSurface(sur.s)
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proc drawText*(sur: PSurface, p: TPoint, font: string, text: string,
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bg: TColor, fg: TColor = colBlack, fontSize: int = 9) =
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## Draws text, at location ``p``, ``font`` specifies the path to
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## the ttf file, ``fontSize`` specifies the font size in pt, and ``fg``
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## and ``bg`` specify the foreground and background colors.
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var fontFile = OpenFont(font, fontSize) # Open the font file
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if fontFile == nil: raise newException(ESDLError, "Could not open font file")
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proc drawText*(sur: PSurface, p: TPoint, text: string,
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bg: TColor, font = defaultFont) =
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## Draws text, at location ``p`` with font ``font``. ``bg``
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## is the background color.
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var textSur: PSurface # This surface will have the text drawn on it
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new(textSur, surfaceFinalizer)
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var RGBfg = fg.extractRGB
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var RGBbg = bg.extractRGB
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# Convert colors.TColor to SDL.TColor
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var SDLfg: SDL.TColor
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SDLfg.r = toU8(RGBfg.r)
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SDLfg.g = toU8(RGBfg.g)
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SDLfg.b = toU8(RGBfg.b)
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var SDLbg: SDL.TColor
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SDLbg.r = toU8(RGBbg.r)
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SDLbg.g = toU8(RGBbg.g)
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SDLbg.b = toU8(RGBbg.b)
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# Render the text
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textSur.s = sdl_ttf.RenderTextShaded(fontFile, text, SDLfg, SDLbg)
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textSur.s = sdl_ttf.RenderTextShaded(font.f, text, font.color, toSdlColor(bg))
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# Merge the text surface with sur
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sur.blitSurface((p.x, p.y, sur.w, sur.h), textSur, (0, 0, sur.w, sur.h))
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sur.blit((p.x, p.y, sur.w, sur.h), textSur, (0, 0, sur.w, sur.h))
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# Free the surface
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SDL.FreeSurface(sur.s)
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proc drawCircle*(sur: PSurface, p: TPoint, r: Natural, color: TColor) =
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## draws a circle with center `p` and radius `r` with the given color
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## onto the surface `sur`.
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@@ -185,15 +185,21 @@ proc drawCircle*(sur: PSurface, p: TPoint, r: Natural, color: TColor) =
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var x = p.x
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var y = p.y
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while px <= py + 1:
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setPix(video, pitch, x + px, y + py, color)
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setPix(video, pitch, x + px, y - py, color)
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setPix(video, pitch, x - px, y + py, color)
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setPix(video, pitch, x - px, y - py, color)
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if x+px <% sur.w:
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if y+py <% sur.h: setPix(video, pitch, x+px, y+py, color)
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if y-py <% sur.h: setPix(video, pitch, x+px, y-py, color)
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if x-px <% sur.w:
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if y+py <% sur.h: setPix(video, pitch, x-px, y+py, color)
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if y-py <% sur.h: setPix(video, pitch, x-px, y-py, color)
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setPix(video, pitch, x + py, y + px, color)
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setPix(video, pitch, x + py, y - px, color)
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setPix(video, pitch, x - py, y + px, color)
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setPix(video, pitch, x - py, y - px, color)
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if x+py <% sur.w:
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if y+px <% sur.h: setPix(video, pitch, x+py, y+px, color)
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if y-px <% sur.h: setPix(video, pitch, x+py, y-px, color)
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if x-py <% sur.w:
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if y+px <% sur.h: setPix(video, pitch, x-py, y+px, color)
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if y-px <% sur.h: setPix(video, pitch, x-py, y-px, color)
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if a < 0:
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a = a + (2 * px + 3)
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@@ -202,16 +208,22 @@ proc drawCircle*(sur: PSurface, p: TPoint, r: Natural, color: TColor) =
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py = py - 1
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px = px + 1
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proc `>-<`(val: int, s: PSurface): int {.inline.} =
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return if val < 0: 0 elif val >= s.w: s.w-1 else: val
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proc `>|<`(val: int, s: PSurface): int {.inline.} =
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return if val < 0: 0 elif val >= s.h: s.h-1 else: val
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proc drawLine*(sur: PSurface, p1, p2: TPoint, color: TColor) =
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## draws a line between the two points `p1` and `p2` with the given color
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## onto the surface `sur`.
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var stepx, stepy: int = 0
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var x0: int = p1.x
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var x1: int = p2.x
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var y0: int = p1.y
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var y1: int = p2.y
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var dy: int = y1 - y0
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var dx: int = x1 - x0
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var x0 = p1.x >-< sur
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var x1 = p2.x >-< sur
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var y0 = p1.y >|< sur
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var y1 = p2.y >|< sur
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var dy = y1 - y0
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var dx = x1 - x0
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if dy < 0:
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dy = -dy
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stepy = -1
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@@ -247,7 +259,7 @@ proc drawLine*(sur: PSurface, p1, p2: TPoint, color: TColor) =
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setPix(video, pitch, x0, y0, color)
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proc drawHorLine*(sur: PSurface, x, y, w: Natural, Color: TColor) =
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## draws a horizontal line from (x,y) to (x+w-1, h).
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## draws a horizontal line from (x,y) to (x+w-1, y).
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var video = cast[PPixels](sur.s.pixels)
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var pitch = sur.s.pitch div ColSize
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@@ -264,44 +276,6 @@ proc drawVerLine*(sur: PSurface, x, y, h: Natural, Color: TColor) =
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for i in 0 .. min(sur.s.h-y, h-1)-1:
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setPix(video, pitch, x, y + i, color)
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proc drawLine2*(sur: PSurface, p0, p1: TPoint, color: TColor) =
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## Draws a line from ``p0`` to ``p1``, using the Bresenham's line algorithm
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var (x0, x1, y0, y1) = (p0.x, p1.x, p0.y, p1.y)
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if x0 >= sur.s.w: x0 = sur.s.w-1
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if x1 >= sur.s.w: x1 = sur.s.w-1
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if y0 >= sur.s.h: y0 = sur.s.h-1
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if y1 >= sur.s.h: y1 = sur.s.h-1
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var video = cast[PPixels](sur.s.pixels)
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var pitch = sur.s.pitch div ColSize
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var steep = abs(y1 - y0) > abs(x1 - x0)
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if steep:
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swap(x0, y0)
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swap(x1, y1)
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if x0 > x1:
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swap(x0, x1)
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swap(y0, y1)
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var deltax = x1 - x0
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var deltay = abs(y1 - y0)
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var error = deltax div 2
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var ystep: int
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var y = y0
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if y0 < y1: ystep = 1 else: ystep = -1
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for x in x0..x1:
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if steep:
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setPix(video, pitch, y, x, color)
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else:
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setPix(video, pitch, x, y, color)
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error = error - deltay
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if error < 0:
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y = y + ystep
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error = error + deltax
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proc fillCircle*(s: PSurface, p: TPoint, r: Natural, color: TColor) =
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## draws a circle with center `p` and radius `r` with the given color
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## onto the surface `sur` and fills it.
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@@ -361,22 +335,18 @@ proc fillRect*(sur: PSurface, r: TRect, col: TColor) =
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proc Plot4EllipsePoints(sur: PSurface, CX, CY, X, Y: Natural, col: TColor) =
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var video = cast[PPixels](sur.s.pixels)
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var pitch = sur.s.pitch div ColSize
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if CX+X <= sur.s.w-1 and CY+Y <= sur.s.h-1:
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setPix(video, pitch, CX+X, CY+Y, col)
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if CX-X <= sur.s.w-1 and CY+Y <= sur.s.h-1:
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setPix(video, pitch, CX-X, CY+Y, col)
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if CX-X <= sur.s.w-1 and CY-Y <= sur.s.h-1:
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setPix(video, pitch, CX-X, CY-Y, col)
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if CX+X <= sur.s.w-1 and CY-Y <= sur.s.h-1:
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setPix(video, pitch, CX+X, CY-Y, col)
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if CX+X <= sur.s.w-1:
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if CY+Y <= sur.s.h-1: setPix(video, pitch, CX+X, CY+Y, col)
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if CY-Y <= sur.s.h-1: setPix(video, pitch, CX+X, CY-Y, col)
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if CX-X <= sur.s.w-1:
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if CY+Y <= sur.s.h-1: setPix(video, pitch, CX-X, CY+Y, col)
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if CY-Y <= sur.s.h-1: setPix(video, pitch, CX-X, CY-Y, col)
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proc drawEllipse*(sur: PSurface, CX, CY, XRadius, YRadius: Natural, col: TColor) =
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## Draws an ellipse, ``CX`` and ``CY`` specify the center X and Y of the ellipse,
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## ``XRadius`` and ``YRadius`` specify half the width and height of the ellipse.
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proc drawEllipse*(sur: PSurface, CX, CY, XRadius, YRadius: Natural,
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col: TColor) =
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## Draws an ellipse, ``CX`` and ``CY`` specify the center X and Y of the
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||||
## ellipse, ``XRadius`` and ``YRadius`` specify half the width and height
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## of the ellipse.
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var
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X, Y: Natural
|
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XChange, YChange: Natural
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@@ -438,18 +408,15 @@ proc plotAA(sur: PSurface, x, y, c: float, color: TColor) =
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setPix(video, pitch, x.toInt(), y.toInt(),
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pixColor.intensity(1.0 - c) + color.intensity(c))
|
||||
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||||
import math
|
||||
proc ipart(x: float): float =
|
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return x.trunc()
|
||||
proc fpart(x: float): float =
|
||||
return x - ipart(x)
|
||||
proc rfpart(x: float): float =
|
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return 1.0 - fpart(x)
|
||||
proc drawLineAA(sur: PSurface, p1: TPoint, p2: TPoint, color: TColor) =
|
||||
## Draws a anti-aliased line from ``p1`` to ``p2``, using Xiaolin Wu's line algorithm
|
||||
proc ipart(x: float): float = return x.trunc()
|
||||
proc fpart(x: float): float = return x - ipart(x)
|
||||
proc rfpart(x: float): float = return 1.0 - fpart(x)
|
||||
|
||||
proc drawLineAA(sur: PSurface, p1, p2: TPoint, color: TColor) =
|
||||
## Draws a anti-aliased line from ``p1`` to ``p2``, using Xiaolin Wu's
|
||||
## line algorithm
|
||||
var (x1, x2, y1, y2) = (p1.x.toFloat(), p2.x.toFloat(),
|
||||
p1.y.toFloat(), p2.y.toFloat())
|
||||
|
||||
var dx = x2 - x1
|
||||
var dy = y2 - y1
|
||||
if abs(dx) < abs(dy):
|
||||
@@ -482,27 +449,28 @@ proc drawLineAA(sur: PSurface, p1: TPoint, p2: TPoint, color: TColor) =
|
||||
sur.plotAA(x.toFloat(), ipart(intery), rfpart(intery), color)
|
||||
sur.plotAA(x.toFloat(), ipart(intery) + 1.0, fpart(intery), color)
|
||||
intery = intery + gradient
|
||||
|
||||
|
||||
if sdl.Init(sdl.INIT_VIDEO) < 0:
|
||||
echo "sdl init failed: " & $SDL.GetError()
|
||||
|
||||
if sdl_ttf.Init() < 0:
|
||||
echo "sdl_ttf init failed: " & $SDL.GetError()
|
||||
template withEvents(surf: PSurface, event: expr, actions: stmt): stmt =
|
||||
while True:
|
||||
var event: SDL.TEvent
|
||||
if SDL.PollEvent(addr(event)) == 1:
|
||||
actions
|
||||
|
||||
if sdl.Init(sdl.INIT_VIDEO) < 0: raiseEGraphics()
|
||||
if sdl_ttf.Init() < 0: raiseEGraphics()
|
||||
|
||||
when isMainModule:
|
||||
#var txtSurf = drawText(
|
||||
|
||||
var surf = newScreenSurface(800, 600)
|
||||
var r: TRect = (0, 0, 900, 900)
|
||||
|
||||
# Draw the shapes
|
||||
surf.fillRect(r, colWhite)
|
||||
surf.drawLineAA((100, 170), (400, 471), colTan)
|
||||
surf.drawLine2((100, 170), (400, 471), colRed)
|
||||
surf.drawLine((100, 170), (400, 471), colRed)
|
||||
|
||||
surf.drawEllipse(200, 300, 200, 30, colSeaGreen)
|
||||
surf.drawHorLine(1, 300, 400, colViolet) # Check if the ellipse is the size it's suppose to be.
|
||||
surf.drawHorLine(1, 300, 400, colViolet)
|
||||
# Check if the ellipse is the size it's suppose to be.
|
||||
surf.drawVerLine(200, 300 - 30 + 1, 60, colViolet) # ^^ | i suppose it is
|
||||
|
||||
surf.drawEllipse(400, 300, 300, 300, colOrange)
|
||||
@@ -512,35 +480,36 @@ when isMainModule:
|
||||
surf.drawVerLine(5, 60, 800, colRed)
|
||||
surf.drawCircle((600, 500), 60, colRed)
|
||||
|
||||
surf.drawText((300, 300), "VeraMono.ttf", "TEST", colMidnightBlue, 150)
|
||||
var textSize = textBounds("VeraMono.ttf", 150, "TEST")
|
||||
surf.drawText((300, 300 + textSize.height), "VeraMono.ttf", $textSize.width & ", " & $textSize.height, colDarkGreen, 50)
|
||||
#surf.drawText((300, 300), "TEST", colMidnightBlue)
|
||||
#var textSize = textBounds("TEST")
|
||||
#surf.drawText((300, 300 + textSize.height), $textSize.width & ", " &
|
||||
# $textSize.height, colDarkGreen)
|
||||
|
||||
var mouseStartX = 0
|
||||
var mouseStartY = 0
|
||||
withEvents(surf, event):
|
||||
case event.theType:
|
||||
case event.kind:
|
||||
of SDL.QUITEV:
|
||||
break
|
||||
of SDL.KEYDOWN:
|
||||
if event.key.keysym.sym == SDL.K_LEFT:
|
||||
echo(event.key.keysym.sym)
|
||||
if event.sym == SDL.K_LEFT:
|
||||
echo(event.sym)
|
||||
surf.drawHorLine(395, 300, 5, colPaleGoldenRod)
|
||||
echo("Drawing")
|
||||
else:
|
||||
echo(event.key.keysym.sym)
|
||||
echo(event.sym)
|
||||
of SDL.MOUSEBUTTONDOWN:
|
||||
# button.x/y is F* UP!
|
||||
echo("MOUSEDOWN", event.button.x)
|
||||
mouseStartX = event.button.x
|
||||
mouseStartY = event.button.y
|
||||
echo("MOUSEDOWN ", event.x)
|
||||
mouseStartX = event.x
|
||||
mouseStartY = event.y
|
||||
|
||||
of SDL.MOUSEBUTTONUP:
|
||||
echo("MOUSEUP ", mouseStartX)
|
||||
if mouseStartX != 0 and mouseStartY != 0:
|
||||
echo(mouseStartX, "->", int(event.button.x))
|
||||
echo(mouseStartX, "->", int(event.x))
|
||||
surf.drawLineAA((mouseStartX, MouseStartY),
|
||||
(int(event.button.x), int(event.button.y)), colPaleGoldenRod)
|
||||
(int(event.x), int(event.y)), colPaleGoldenRod)
|
||||
mouseStartX = 0
|
||||
mouseStartY = 0
|
||||
|
||||
|
||||
Reference in New Issue
Block a user