canvas-gd.bac
' =========================
' Purpose of this program
' =========================
'
' This is the CANVAS-GD context. It provides a GIF Canvas
' for demonstration drawing purposes.
'
' It requires the presence of LibGD on your system.
'
' - The top left of the created window has coordinate (0, 0).
' - The API is almost 100% compatible with the High Performance Canvas API.
' - Rotation applies to the visible part of the image only, and cannot merge parts.
' - For animations, use new keyword FRAMES to determine the amount of frames. Default 1 frame is created.
' - The GIF type does not handle alpha or alpha blending.
' - The GIF type supports not more than 256 colors per frame.
' - No mouse interaction.
'
' =========================
' Documentation for the API
' =========================
'
' WINDOW(title$, xsize, ysize)
' => Create a GIF file with name "title$.gif", x size and y size
'
' PIXEL(x, y)
' => Put a pixel in the current color on position x, y
'
' LINE(xstart, ystart, xend, yend)
' => Draw a line from xstart, ystart to xend, yend
'
' SQUARE(x, y, xsize, ysize, fill)
' => Draw a square with center position at x, y and size x size y.
'
' CIRCLE(x, y, xsize, ysize, fill)
' => Draw a circle with center position at x, y and radius x, y.
'
' ARC(x, y, xsize, ysize, start, end, fill)
' => Draw an arc with center position at x, y and radius x, y, start and end (degrees).
'
' TRIANGLE(x, y, base, height, fill)
' => Draw a triangle with center position at x, y and base/height.
'
' POLYGON(x, y, radius, sides, fill)
' => Draw a polygon with center position at x, y, a radius, and amount of sides.
'
' QBEZIER(xstart, ystart, bendx, bendy, xend, yend)
' => Draw a quadratic Bezier curve starting at (xstart, ystart), ending at (xend, yend) bended by (bendx, bendy)
'
' CBEZIER(xstart, ystart, bend1x, bend1y, bend2x, bend2y, xend, yend)
' => Draw a cubic Bezier curve starting at (xstart, ystart), ending at (xend, yend) bended by (bend1x, bend1y) and (bend2x, bend2y).
'
' PAINT(x, y)
' => Fill with current color starting and x, y
'
' TEXT(txt$, x, y)
' => Put text txt$ and position x, y
'
' GETINK(x, y, mode)
' => Obtain color at position x,y. Mode values: 0=r 1=g 2=b 3=alpha, 4=RGBA 5=ABGR quadruple in one integer of 4 bytes
'
' FLIP(x)
' => Flip the image where x=0: horizontal x=1: vertical x=2: horizontal and vertical. Other values are ignored.
'
' GRID(x, y, w, h, hboxes, vboxes)
' => Create a grid at x, y topleft, with size w, h and amount of boxes hboxes, vboxes
'
' INK(r, g, b, a)
' => Set the color to r, g, b. When alpha = 0 then current color is set to transparent.
'
' PEN(x, yesno)
' => Set the width of the pixel to x (float value), and use anti-aliasing y/n - for GD does nothing
'
' ROTATION(angle)
' => Set the default rotation for LINE, CIRCLE, SQUARE, TRIANGLE, ARC, POLYGON, GRID, TEXT to <angle> (in degrees)
'
' SCALE(factor)
' => Set scaling for LINE, CIRCLE, SQUARE, TRIANGLE, ARC, POLYGON, GRID, TEXT to <factor> (float value)
'
' MOVE(angle, distance)
' => Move LINE, CIRCLE, SQUARE, TRIANGLE, ARC, POLYGON, GRID, TEXT <distance> pixels in the direction of <angle>.
'
' SYNC
' => Swap the background buffer to the canvas. When all frames are done this functions returns FALSE.
'
' QUIT
' => Quit the canvas module
'
' CLS
' => Clear the screen in the last color set by INK
'
' CALLBACK(timeout, function)
' => Call function repeatedly after timeout of millisecs. Usable for moving pictures.
'
' WAITKEY
' => Wait for a key to be pressed, this will exit the program
'
' PENUP
' => Take the pen from the canvas
'
' PENDOWN
' => Put the pen back onto the canvas (default)
'
' PENXY(x, y)
' => Set the current x and y coordinate of the pen
'
' PENTYPE(type)
' => Set the type of pen drawing, 0 = line, 1 = arc
'
' TURNRIGHT(angle)
' => Rotate the direction of the pen to the right in degrees
'
' TURN(angle) / TURNLEFT(angle)
' => Rotate the direction of the pen to the left in degrees
'
' RESETANGLE
' => Put the angle of the turtle back to 90
'
' DRAW(length)
' => Draw using the pen
'
' LOADFONT("file.jhf")
' => Load Hershey vector font in "James Hunt Format" - see http://www.whence.com/hershey-fonts/
'
' FONTALIGN(x)
' => In case of scaling, align font centered (0 = default) or align font on x-position (1 = left).
'
' =========================
' GD version specific calls
' =========================
'
' FRAMES(nr)
' => How many frames should be created in an animated GIF (default: 1).
'
' DELAY(nr)
' => Delay between the frames in 1/100 seconds (default value: 100 = 1 sec).
'
' ===========================
' License and release history
' ===========================
'
' The concept of the turtle drawing with friendly permission from Tomaaz:
' PENON, PENOFF, PENXY, TURNRIGHT, TURNLEFT, TURN, DRAW.
'
' (c) Peter van Eerten, November-June 2017 - MIT License.
'
' 1.0: Initial release.
' 1.1: Use transparency when alpha value in INK is 0 - suggestion forum member vovchik.
' 1.2: Support for transparent animations, code cleaning
' 1.3: Possibility to set line thickness, added GETINK.
' 1.4: Improved import logic. Improved GETINK.
' 1.5: Better color lookup for transparent animations resulting in smaller file size.
' 1.6: Added FLIP, QBEZIER and CBEZIER. Set default drawing color to black.
' 1.7: Better frame counting allowing non-callback programs. Added DELAY keyword.
' 1.8: DRAW will move turtle even in when in PENUP mode, added TURN
' 1.9: Fixed bug in drawing turtle graphics
' 1.10: Pensize did not work for animations. TURN accepts float.
' 1.11: Improved font rendering.
' 1.12: Added FONTALIGN command for alignment of scaled text
' 1.13: Changed ARC so it actually draws an arc between degrees (breaks ARC API)
'---------------------------------------------------------------------------------------------------------------------------------------------
DECLARE canvas_gd_fd TYPE FILE*
RECORD CANVAS_GD
LOCAL img_current TYPE void*
LOCAL xsize, ysize, colour, speed, nr_frames, frame_ctr, font_width, font_align, rotate, bg, angle, step, transparent
LOCAL pen_smooth, pen_active, pen_type, flipping
LOCAL pen_size, scaling, pen_xpos, pen_ypos, pen_direction TYPE float
LOCAL (*callb)(void) TYPE void
LOCAL font$[96]
END RECORD
FUNCTION Import_GD_functions
LOCAL lib$
LOCAL seq = -1
CATCH GOTO lib_handle_error
lib$ = "libgd.so.0"
LABEL lib_handle_error
INCR seq
IF seq > 100 THEN RETURN FALSE
lib$ = LEFT$(lib$, INSTRREV(lib$, ".")) & STR$(seq)
IMPORT "gdImageCreate(int,int)" FROM lib$ TYPE void*
CATCH RESET
IMPORT "gdImageArc(void*,int,int,int,int,int,int,int)" FROM lib$ TYPE void
IMPORT "gdImageColorAllocate(void*,int,int,int)" FROM lib$ TYPE int
IMPORT "gdImageColorResolveAlpha(void*,int,int,int,int)" FROM lib$ TYPE int
IMPORT "gdImageColorTransparent(void*,int)" FROM lib$ TYPE void
IMPORT "gdImageCopyRotated(void*,void*,double,double,int,int,int,int,int)" FROM lib$ TYPE void
IMPORT "gdImageDestroy(void*)" FROM lib$ TYPE void
IMPORT "gdImageFlipBoth(void*)" FROM lib$ TYPE void
IMPORT "gdImageFlipHorizontal(void*)" FROM lib$ TYPE void
IMPORT "gdImageFlipVertical(void*)" FROM lib$ TYPE void
IMPORT "gdImageGifAnimAdd(void*,FILE*,int,int,int,int,int,void*)" FROM lib$ TYPE void
IMPORT "gdImageGifAnimBegin(void*,FILE*,int,int)" FROM lib$ TYPE void
IMPORT "gdImageGifAnimEnd(FILE*)" FROM lib$ TYPE void
IMPORT "gdImageFill(void*,int,int,int)" FROM lib$ TYPE void
IMPORT "gdImageFilledArc(void*,int,int,int,int,int,int,int,int)" FROM lib$ TYPE void
IMPORT "gdImageFilledRectangle(void*,int,int,int,int,int)" FROM lib$ TYPE void
IMPORT "gdImageLine(void*,int,int,int,int,int)" FROM lib$ TYPE void
IMPORT "gdImagePaletteCopy(void*,void*)" FROM lib$ TYPE void
IMPORT "gdImageRectangle(void*,int,int,int,int,int)" FROM lib$ TYPE void
IMPORT "gdImageGetPixel(void*,int,int)" FROM lib$ TYPE int
IMPORT "gdImageSetPixel(void*,int,int,int)" FROM lib$ TYPE void
IMPORT "gdImageSetThickness(void*,int)" FROM lib$ TYPE void
CONST gdArc = 0
CONST gdDisposalRestorePrevious = 3
RETURN TRUE
ENDFUNCTION
' This is the "futurum.jhf" font from the hershey-font package. Their license requires that the following acknowledgements must be distributed with the font data:
' - The Hershey Fonts were originally created by Dr. A. V. Hershey while working at the U. S. National Bureau of Standards.
' - The format of the Font data in this distribution was originally created by James Hurt Cognition, Inc., 900 Technology Park Drive, Billerica, MA 01821
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' Needed to parse font data
DEF FN CANVAS_Coord(x$) = ASC(x$)-ASC("R")
' Primitives available in small letters as well
ALIAS "WINDOW" TO "window"
ALIAS "PIXEL" TO "pixel"
ALIAS "LINE" TO "line"
ALIAS "CIRCLE" TO "circle"
ALIAS "ARC" TO "arc"
ALIAS "SQUARE" TO "square"
ALIAS "TRIANGLE" TO "triangle"
ALIAS "POLYGON" TO "polygon"
ALIAS "PAINT" TO "paint"
ALIAS "TEXT" TO "text"
ALIAS "GRID" TO "grid"
ALIAS "QBEZIER" TO "qbezier"
ALIAS "CBEZIER" TO "cbezier"
ALIAS "INK" TO "ink"
ALIAS "PEN" TO "pen"
ALIAS "ROTATION" TO "rotation"
ALIAS "SCALE" TO "scale"
ALIAS "MOVE" TO "move"
ALIAS "GETINK" TO "getink"
ALIAS "FLIP" TO "flip"
ALIAS "SYNC" TO "sync"
ALIAS "QUIT" TO "quit"
ALIAS "CLS" TO "cls"
ALIAS "CALLBACK" TO "callback"
ALIAS "WAITKEY" TO "waitkey"
ALIAS "PENDOWN" TO "pendown"
ALIAS "PENUP" TO "penup"
ALIAS "PENXY" TO "penxy"
ALIAS "PENTYPE" TO "pentype"
ALIAS "TURNRIGHT" TO "turnright"
ALIAS "TURNLEFT" TO "turnleft"
ALIAS "TURN" TO "turn"
ALIAS "RESETANGLE" TO "resetangle"
ALIAS "DRAW" TO "draw"
ALIAS "LOADFONT" TO "loadfont"
ALIAS "FRAMES" TO "frames"
ALIAS "DELAY" TO "delay"
'------------------------------------------------------------------
SUB Read_Font_Data
LOCAL x
' Get the fonts for OpenGL
FOR x = 0 TO 95
READ CANVAS_GD.font$[x]
NEXT
END SUB
SUB WINDOW(title$, xsize, ysize)
IF RIGHT$(title$, 4) <> ".gif" THEN title$ = title$ & ".gif"
OPEN title$ FOR WRITING AS canvas_gd_fd
CANVAS_GD.img_current = gdImageCreate(xsize, ysize)
CANVAS_GD.colour = gdImageColorAllocate(CANVAS_GD.img_current, 255, 255, 255)
CANVAS_GD.bg = CANVAS_GD.colour
gdImageGifAnimBegin(CANVAS_GD.img_current, canvas_gd_fd, 0, 0)
CANVAS_GD.xsize = xsize
CANVAS_GD.ysize = ysize
' Set default drawing color to black
CALL INK(0,0,0,255)
' Pen on by default
CANVAS_GD.pen_active = 1
' Set font width
CANVAS_GD.font_width = 16
' Determines if the font should be centered (0) or left-aligned (1) when scaling is applied
CANVAS_GD.font_align = 0
ENDSUB
SUB CLS
gdImageFilledRectangle(CANVAS_GD.img_current, 0, 0, CANVAS_GD.xsize, CANVAS_GD.ysize, CANVAS_GD.colour)
CANVAS_GD.bg = CANVAS_GD.colour
END SUB
SUB PEN(size#, flag)
CANVAS_GD.pen_size = size#
gdImageSetThickness(CANVAS_GD.img_current, size#)
' This value does nothing for now
CANVAS_GD.pen_smooth = flag
ENDSUB
SUB PENDOWN
CANVAS_GD.pen_active = 1
END SUB
SUB PENUP
CANVAS_GD.pen_active = 0
END SUB
SUB PENXY(float xpos, float ypos)
CANVAS_GD.pen_xpos = xpos
CANVAS_GD.pen_ypos = ypos
ENDSUB
SUB PENTYPE(type)
IF type < 0 OR type > 1 THEN type = 0
CANVAS_GD.pen_type = type
ENDSUB
SUB TURNRIGHT(float angle)
DECR CANVAS_GD.pen_direction, angle
WHILE CANVAS_GD.pen_direction < 0
INCR CANVAS_GD.pen_direction, 360
WEND
ENDSUB
SUB TURNLEFT(float angle)
INCR CANVAS_GD.pen_direction, angle
WHILE CANVAS_GD.pen_direction > 360
DECR CANVAS_GD.pen_direction, 360
WEND
ENDSUB
SUB TURN(float angle)
TURNRIGHT(angle)
ENDSUB
SUB RESETANGLE
CANVAS_GD.pen_direction = 90
ENDSUB
SUB DRAW(float length)
LOCAL x, y TYPE float
LOCAL rotate
IF CANVAS_GD.pen_type = 0 THEN
x = CANVAS_GD.pen_xpos + COS(RAD(CANVAS_GD.pen_direction))*length
y = CANVAS_GD.pen_ypos - SIN(RAD(CANVAS_GD.pen_direction))*length
IF CANVAS_GD.pen_active THEN CALL LINE(CANVAS_GD.pen_xpos, CANVAS_GD.pen_ypos, x, y)
CANVAS_GD.pen_xpos = x
CANVAS_GD.pen_ypos = y
ELIF CANVAS_GD.pen_type = 1 THEN
x = CANVAS_GD.pen_xpos + COS(RAD(CANVAS_GD.pen_direction))*(length/2)
y = CANVAS_GD.pen_ypos - SIN(RAD(CANVAS_GD.pen_direction))*(length/2)
rotate = CANVAS_GD.rotate
CANVAS_GD.rotate = CANVAS_GD.pen_direction
IF CANVAS_GD.pen_active THEN CALL ARC(x, y, length/2, length/2, 0, 360, 0)
CANVAS_GD.rotate = rotate
CANVAS_GD.pen_xpos = CANVAS_GD.pen_xpos + COS(RAD(CANVAS_GD.pen_direction))*length
CANVAS_GD.pen_ypos = CANVAS_GD.pen_ypos - SIN(RAD(CANVAS_GD.pen_direction))*length
ENDIF
ENDSUB
SUB INK(unsigned char r, unsigned char g, unsigned char b, unsigned char alpha)
IF alpha = 0 THEN
CANVAS_GD.colour = gdImageColorResolveAlpha(CANVAS_GD.img_current, r, g, b, 127)
CANVAS_GD.transparent = CANVAS_GD.colour
ELSE
CANVAS_GD.colour = gdImageColorResolveAlpha(CANVAS_GD.img_current, r, g, b, 0)
ENDIF
ENDSUB
FUNCTION Create_New_Image
LOCAL img TYPE void*
LOCAL colour
img = gdImageCreate(CANVAS_GD.xsize, CANVAS_GD.ysize)
colour = gdImageColorAllocate(img, 255, 255, 255)
gdImagePaletteCopy(img, CANVAS_GD.img_current)
gdImageFilledRectangle(img, 0, 0, CANVAS_GD.xsize, CANVAS_GD.ysize, CANVAS_GD.bg)
RETURN img
ENDFUNCTION
SUB MOVE(angle, step)
CANVAS_GD.angle = angle
CANVAS_GD.step = step
ENDSUB
SUB ROTATION(angle)
CANVAS_GD.rotate = -1*angle
ENDSUB
SUB SCALE(factor#)
CANVAS_GD.scaling = factor#
ENDSUB
FUNCTION Move_X(x)
IF CANVAS_GD.step <> 0 THEN INCR x, COS(RAD(CANVAS_GD.angle))*CANVAS_GD.step
RETURN x
ENDFUNCTION
FUNCTION Move_Y(y)
IF CANVAS_GD.step <> 0 THEN DECR y, SIN(RAD(CANVAS_GD.angle))*CANVAS_GD.step
RETURN y
ENDFUNCTION
SUB PIXEL(x, y)
gdImageSetPixel(CANVAS_GD.img_current, x, y, CANVAS_GD.colour)
ENDSUB
SUB LINE(xstart, ystart, xend, yend)
LOCAL length, newlen, midx, midy
LOCAL angle#
LOCAL img_org, img_tmp TYPE void*
xstart = Move_X(xstart)
ystart = Move_Y(ystart)
xend = Move_X(xend)
yend = Move_Y(yend)
IF CANVAS_GD.rotate <> 0 THEN
img_org = CANVAS_GD.img_current
img_tmp = Create_New_Image()
CANVAS_GD.img_current = img_tmp
ENDIF
angle#=ATN(ABS(yend-ystart)/ABS(xend-xstart))
length = SQR(POW(xend-xstart,2)+POW(yend-ystart,2))
newlen = length*CANVAS_GD.scaling
IF xstart < xend THEN
midx = xstart+ABS(xend-xstart)/2
xstart = midx-COS(angle#)*newlen/2
xend = midx+COS(angle#)*newlen/2
ELSE
midx = xstart-ABS(xend-xstart)/2
xstart = midx+COS(angle#)*newlen/2
xend = midx-COS(angle#)*newlen/2
FI
IF ystart < yend THEN
midy = ystart+ABS(yend-ystart)/2
ystart = midy-SIN(angle#)*newlen/2
yend = midy+SIN(angle#)*newlen/2
ELSE
midy = ystart-ABS(yend-ystart)/2
ystart = midy+SIN(angle#)*newlen/2
yend = midy-SIN(angle#)*newlen/2
ENDIF
gdImageLine(CANVAS_GD.img_current, xstart, ystart, xend, yend, CANVAS_GD.colour)
IF CANVAS_GD.rotate <> 0 THEN
gdImageCopyRotated(img_org, CANVAS_GD.img_current, midx, midy, xstart, ystart, xend, yend, CANVAS_GD.rotate)
CANVAS_GD.img_current = img_org
gdImageDestroy(img_tmp)
ENDIF
ENDSUB
SUB SQUARE(x, y, xrad, yrad, fill)
LOCAL img_org, img_tmp TYPE void*
x = Move_X(x)
y = Move_Y(y)
IF CANVAS_GD.rotate <> 0 THEN
img_org = CANVAS_GD.img_current
img_tmp = Create_New_Image()
CANVAS_GD.img_current = img_tmp
ENDIF
xrad = xrad*CANVAS_GD.scaling
yrad = yrad*CANVAS_GD.scaling
IF fill THEN
gdImageFilledRectangle(CANVAS_GD.img_current, x-xrad, y-yrad, x+xrad, y+yrad, CANVAS_GD.colour)
ELSE
gdImageRectangle(CANVAS_GD.img_current, x-xrad, y-yrad, x+xrad, y+yrad, CANVAS_GD.colour)
ENDIF
IF CANVAS_GD.rotate <> 0 THEN
gdImageCopyRotated(img_org, CANVAS_GD.img_current, x, y, x-xrad, y-yrad, xrad*2, yrad*2, CANVAS_GD.rotate)
CANVAS_GD.img_current = img_org
gdImageDestroy(img_tmp)
ENDIF
ENDSUB
SUB CIRCLE(x, y, xsize, ysize, fill)
LOCAL img_org, img_tmp TYPE void*
x = Move_X(x)
y = Move_Y(y)
IF CANVAS_GD.rotate <> 0 THEN
img_org = CANVAS_GD.img_current
img_tmp = Create_New_Image()
CANVAS_GD.img_current = img_tmp
ENDIF
xsize = xsize*CANVAS_GD.scaling
ysize = ysize*CANVAS_GD.scaling
IF fill THEN
gdImageFilledArc(CANVAS_GD.img_current, x, y, xsize*2, ysize*2, 0, 360, CANVAS_GD.colour, gdArc)
ELSE
gdImageArc(CANVAS_GD.img_current, x, y, xsize*2, ysize*2, 0, 360, CANVAS_GD.colour)
ENDIF
IF CANVAS_GD.rotate <> 0 THEN
gdImageCopyRotated(img_org, CANVAS_GD.img_current, x, y, x-xsize, y-ysize, xsize*2, ysize*2, CANVAS_GD.rotate)
CANVAS_GD.img_current = img_org
gdImageDestroy(img_tmp)
ENDIF
END SUB
SUB ARC(x, y, xrad, yrad, start, end, fill)
LOCAL img_org, img_tmp TYPE void*
x = Move_X(x)
y = Move_Y(y)
IF CANVAS_GD.rotate <> 0 THEN
img_org = CANVAS_GD.img_current
img_tmp = Create_New_Image()
CANVAS_GD.img_current = img_tmp
ENDIF
xrad = xrad*CANVAS_GD.scaling
yrad = yrad*CANVAS_GD.scaling
IF fill THEN
gdImageFilledArc(CANVAS_GD.img_current, x, y, xrad*2, yrad*2, start, end, CANVAS_GD.colour, gdArc)
ELSE
gdImageArc(CANVAS_GD.img_current, x, y, xrad*2, yrad*2, start, end, CANVAS_GD.colour)
ENDIF
IF CANVAS_GD.rotate <> 0 THEN
gdImageCopyRotated(img_org, CANVAS_GD.img_current, x, y, x-xrad, y-yrad, xrad*2, yrad*2, CANVAS_GD.rotate)
CANVAS_GD.img_current = img_org
gdImageDestroy(img_tmp)
ENDIF
END SUB
SUB TRIANGLE(x, y, base, height, fill)
LOCAL img_org, img_tmp TYPE void*
x = Move_X(x)
y = Move_Y(y)
IF CANVAS_GD.rotate <> 0 THEN
img_org = CANVAS_GD.img_current
img_tmp = Create_New_Image()
CANVAS_GD.img_current = img_tmp
ENDIF
base = base*CANVAS_GD.scaling
height = height*CANVAS_GD.scaling
gdImageLine(CANVAS_GD.img_current, x-base/2, y+height/2, x+base/2, y+height/2, CANVAS_GD.colour)
gdImageLine(CANVAS_GD.img_current, x+base/2, y+height/2, x, y-height/2, CANVAS_GD.colour)
gdImageLine(CANVAS_GD.img_current, x, y-height/2, x-base/2, y+height/2, CANVAS_GD.colour)
IF fill THEN CALL PAINT(x, y)
IF CANVAS_GD.rotate <> 0 THEN
gdImageCopyRotated(img_org, CANVAS_GD.img_current, x, y, x-base/2, y-height/2, base, height, CANVAS_GD.rotate)
CANVAS_GD.img_current = img_org
gdImageDestroy(img_tmp)
ENDIF
ENDSUB
SUB POLYGON(xorg, yorg, radius, sides, fill)
LOCAL i, rot, angle, posx, posy, length, x, y
LOCAL img_org, img_tmp TYPE void*
xorg = Move_X(xorg)
yorg = Move_Y(yorg)
IF CANVAS_GD.rotate <> 0 THEN
img_org = CANVAS_GD.img_current
img_tmp = Create_New_Image()
CANVAS_GD.img_current = img_tmp
ENDIF
radius = radius*CANVAS_GD.scaling
angle = INT(360.0 / sides)
length = INT(SQR((POW(radius, 2) + POW(radius, 2)) - ((2 * radius * radius) * COS(RAD(angle)))) )
rot = -angle/2
xpos = xorg
ypos = yorg - radius
FOR i = 1 TO sides-1
x = xpos + INT(COS(RAD(rot))*length)
y = ypos - INT(SIN(RAD(rot))*length)
gdImageLine(CANVAS_GD.img_current, xpos, ypos, x, y, CANVAS_GD.colour)
DECR rot, angle
xpos = x
ypos = y
NEXT
gdImageLine(CANVAS_GD.img_current, x, y, xorg, yorg-radius, CANVAS_GD.colour)
IF fill THEN CALL PAINT(xorg, yorg)
IF CANVAS_GD.rotate <> 0 THEN
gdImageCopyRotated(img_org, CANVAS_GD.img_current, xorg, yorg, xorg-radius, yorg-radius, radius*2, radius*2, CANVAS_GD.rotate)
CANVAS_GD.img_current = img_org
gdImageDestroy(img_tmp)
ENDIF
ENDSUB
SUB GRID(startx, starty, w, h, hboxes, vboxes)
LOCAL i, size_xbox, size_ybox
LOCAL img_org, img_tmp TYPE void*
startx = Move_X(startx)
starty = Move_Y(starty)
IF CANVAS_GD.rotate <> 0 THEN
img_org = CANVAS_GD.img_current
img_tmp = Create_New_Image()
CANVAS_GD.img_current = img_tmp
ENDIF
DECR startx, (w*CANVAS_GD.scaling-w)/2
DECR starty, (h*CANVAS_GD.scaling-h)/2
w = w*CANVAS_GD.scaling
h = h*CANVAS_GD.scaling
size_xbox = INT(w/hboxes)
size_ybox = INT(h/vboxes)
FOR i = 0 TO hboxes
gdImageLine(CANVAS_GD.img_current, startx+i*size_xbox, starty, startx+i*size_xbox, starty+h, CANVAS_GD.colour)
NEXT
FOR i = 0 TO vboxes
gdImageLine(CANVAS_GD.img_current, startx, starty+i*size_ybox, startx+w, starty+i*size_ybox, CANVAS_GD.colour)
NEXT
IF CANVAS_GD.rotate <> 0 THEN
gdImageCopyRotated(img_org, CANVAS_GD.img_current, startx+w/2, starty+h/2, startx, starty, w+1, h+1, CANVAS_GD.rotate)
CANVAS_GD.img_current = img_org
gdImageDestroy(img_tmp)
ENDIF
ENDSUB
SUB QBEZIER(x0#, y0#, x1#, y1#, x2#, y2#)
LOCAL Ax#, Ay#, Bx#, By#, t#, angle#
LOCAL length, newlen, midx, midy
LOCAL img_org, img_tmp TYPE void*
x0# = Move_X(x0#)
y0# = Move_Y(y0#)
x2# = Move_X(x2#)
y2# = Move_Y(y2#)
IF CANVAS_GD.rotate <> 0 THEN
img_org = CANVAS_GD.img_current
img_tmp = Create_New_Image()
CANVAS_GD.img_current = img_tmp
ENDIF
angle#=ATN(ABS(y2#-y0#)/ABS(x2#-x0#))
length = SQR(POW(x2#-x0#,2)+POW(y2#-y0#,2))
newlen = length*CANVAS_GD.scaling
IF x0# < x2# THEN
midx = x0#+ABS(x2#-x0#)/2
x0# = midx-COS(angle#)*newlen/2
x2# = midx+COS(angle#)*newlen/2
ELSE
midx = x0#-ABS(x2#-x0#)/2
x0# = midx+COS(angle#)*newlen/2
x2# = midx-COS(angle#)*newlen/2
FI
IF y0# < y2# THEN
midy = y0#+ABS(y2#-y0#)/2
y0# = midy-SIN(angle#)*newlen/2
y2# = midy+SIN(angle#)*newlen/2
ELSE
midy = y0#-ABS(y2#-y0#)/2
y0# = midy+SIN(angle#)*newlen/2
y2# = midy-SIN(angle#)*newlen/2
ENDIF
Ax# = x0# : Ay# = y0#
FOR t# = 0 TO 1 STEP 0.01
Bx# = POW((1-t#), 2)*x0# + 2*(1-t#)*t#*x1# + POW(t#,2)*x2#
By# = POW((1-t#), 2)*y0# + 2*(1-t#)*t#*y1# + POW(t#,2)*y2#
gdImageLine(CANVAS_GD.img_current, Ax#, Ay#, Bx#, By#, CANVAS_GD.colour)
Ax# = Bx# : Ay# = By#
NEXT
IF CANVAS_GD.rotate <> 0 THEN
gdImageCopyRotated(img_org, CANVAS_GD.img_current, midx, midy, x0#, y0#, x2#, y2#, CANVAS_GD.rotate)
CANVAS_GD.img_current = img_org
gdImageDestroy(img_tmp)
ENDIF
ENDSUB
SUB CBEZIER(x0#, y0#, x1#, y1#, x2#, y2#, x3#, y3#)
LOCAL Ax#, Ay#, Bx#, By#, t#, angle#
LOCAL length, newlen, midx, midy
LOCAL img_org, img_tmp TYPE void*
x0# = Move_X(x0#)
y0# = Move_Y(y0#)
x3# = Move_X(x3#)
y3# = Move_Y(y3#)
IF CANVAS_GD.rotate <> 0 THEN
img_org = CANVAS_GD.img_current
img_tmp = Create_New_Image()
CANVAS_GD.img_current = img_tmp
ENDIF
angle#=ATN(ABS(y3#-y0#)/ABS(x3#-x0#))
length = SQR(POW(x3#-x0#,2)+POW(y3#-y0#,2))
newlen = length*CANVAS_GD.scaling
IF x0# < x3# THEN
midx = x0#+ABS(x3#-x0#)/2
x0# = midx-COS(angle#)*newlen/2
x3# = midx+COS(angle#)*newlen/2
ELSE
midx = x0#-ABS(x3#-x0#)/2
x0# = midx+COS(angle#)*newlen/2
x3# = midx-COS(angle#)*newlen/2
FI
IF y0# < y3# THEN
midy = y0#+ABS(y3#-y0#)/2
y0# = midy-SIN(angle#)*newlen/2
y3# = midy+SIN(angle#)*newlen/2
ELSE
midy = y0#-ABS(y3#-y0#)/2
y0# = midy+SIN(angle#)*newlen/2
y3# = midy-SIN(angle#)*newlen/2
ENDIF
Ax# = x0# : Ay# = y0#
FOR t# = 0 TO 1 STEP 0.01
Bx# = POW((1-t#), 3)*x0# + 3*POW((1-t#), 2)*t#*x1# + 3*(1-t#)*POW(t#,2)*x2# + POW(t#,3)*x3#
By# = POW((1-t#), 3)*y0# + 3*POW((1-t#), 2)*t#*y1# + 3*(1-t#)*POW(t#,2)*y2# + POW(t#,3)*y3#
gdImageLine(CANVAS_GD.img_current, Ax#, Ay#, Bx#, By#, CANVAS_GD.colour)
Ax# = Bx# : Ay# = By#
NEXT
IF CANVAS_GD.rotate <> 0 THEN
gdImageCopyRotated(img_org, CANVAS_GD.img_current, midx, midy, x0#, y0#, x3#, y3#, CANVAS_GD.rotate)
CANVAS_GD.img_current = img_org
gdImageDestroy(img_tmp)
ENDIF
ENDSUB
SUB PAINT(x, y)
gdImageFill(CANVAS_GD.img_current, x, y, CANVAS_GD.colour)
ENDSUB
SUB LOADFONT(file$)
LOCAL x
LOCAL data$
LOCAL hershey_font TYPE FILE*
IF FILEEXISTS(file$) THEN
OPEN file$ FOR READING AS hershey_font
FOR x = 0 TO 95
READLN data$ FROM hershey_font
CANVAS_GD.font$[x] = MID$(data$, 6)
NEXT
CLOSE FILE hershey_font
ENDIF
ENDSUB
SUB FONTALIGN(align)
' Determines if the font should be centered (0) or aligned to xposition (1) when scaling is applied
CANVAS_GD.font_align = align
ENDSUB
SUB TEXT(txt$, x, y)
LOCAL i, ptr, posx, posy, tox, toy, xorg, txt_width
LOCAL letter$
LOCAL img_org, img_tmp TYPE void*
x = Move_X(x)
y = Move_Y(y)
IF CANVAS_GD.rotate <> 0 THEN
img_org = CANVAS_GD.img_current
img_tmp = Create_New_Image()
CANVAS_GD.img_current = img_tmp
ENDIF
org_width = LEN(txt$)*CANVAS_GD.font_width
txt_width = LEN(txt$)*CANVAS_GD.font_width*CANVAS_GD.scaling
IF CANVAS_GD.font_align = 0 THEN x = x-(txt_width-org_width)/2
xorg = x
FOR i = 1 TO LEN(txt$)
letter$ = CANVAS_GD.font$[ASC(MID$(txt$, i, 1) - 32)]
' Increase canvas position with left hand
INCR x, ABS(CANVAS_Coord(MID$(letter$, 4, 1)))
posx = CANVAS_Coord(MID$(letter$, 6, 1))*CANVAS_GD.scaling + x
posy = CANVAS_Coord(MID$(letter$, 7, 1))*CANVAS_GD.scaling + y
ptr = 8
WHILE ptr < LEN(letter$)
IF MID$(letter$, ptr, 2) = " R" THEN
INCR ptr, 2
posx = CANVAS_Coord(MID$(letter$, ptr, 1))*CANVAS_GD.scaling + x
posy = CANVAS_Coord(MID$(letter$, ptr+1, 1))*CANVAS_GD.scaling + y
ELSE
tox = CANVAS_Coord(MID$(letter$, ptr, 1))*CANVAS_GD.scaling + x
toy = CANVAS_Coord(MID$(letter$, ptr+1, 1))*CANVAS_GD.scaling + y
gdImageLine(CANVAS_GD.img_current, posx, posy, tox, toy, CANVAS_GD.colour)
posx = tox
posy = toy
ENDIF
INCR ptr, 2
WEND
' Increase canvas position with right hand
INCR x, ABS(CANVAS_Coord(MID$(letter$, 5, 1)))
NEXT
IF CANVAS_GD.rotate <> 0 THEN
IF xorg-8.0*CANVAS_GD.scaling+txt_width > CANVAS_GD.xsize THEN txt_width = CANVAS_GD.xsize-xorg
gdImageCopyRotated(img_org, CANVAS_GD.img_current, \
xorg+txt_width/2-(CANVAS_GD.font_width/2)*CANVAS_GD.scaling, y, \
xorg-8.0*CANVAS_GD.scaling, y-16.0*CANVAS_GD.scaling, \
txt_width, 32*CANVAS_GD.scaling, CANVAS_GD.rotate)
CANVAS_GD.img_current = img_org
gdImageDestroy(img_tmp)
ENDIF
END SUB
FUNCTION GETINK(x, y, int mode)
LOCAL c, r, g, b, a, current, offset
offset = SIZEOF(char**)+3*SIZEOF(int)
c = gdImageGetPixel(CANVAS_GD.img_current, x, y)
OPTION MEMTYPE int
r = PEEK(CANVAS_GD.img_current+offset+c*SIZEOF(int))
g = PEEK(CANVAS_GD.img_current+offset+256*SIZEOF(int)+c*SIZEOF(int))
b = PEEK(CANVAS_GD.img_current+offset+256*SIZEOF(int)+256*SIZEOF(int)+c*SIZEOF(int))
IF c <> CANVAS_GD.transparent THEN a = 255
SELECT mode
CASE 0
RETURN r
CASE 1
RETURN g
CASE 2
RETURN b
CASE 3
RETURN a
CASE 4
current = ((r & 0x0ff) << 24) | ((g & 0x0ff) << 16) | ((b & 0x0ff) << 8) | (a & 0x0ff)
RETURN current
CASE 5
current = ((a & 0x0ff) << 24) | ((b & 0x0ff) << 16) | ((g & 0x0ff) << 8) | (r & 0x0ff)
RETURN current
END SELECT
END FUNCTION
SUB FLIP(flag)
CANVAS_GD.flipping = flag
ENDSUB
FUNCTION SYNC
LOCAL img TYPE void*
img = CANVAS_GD.img_current
SELECT CANVAS_GD.flipping
CASE 0
gdImageFlipHorizontal(CANVAS_GD.img_current)
CASE 1
gdImageFlipVertical(CANVAS_GD.img_current)
CASE 2
gdImageFlipBoth(CANVAS_GD.img_current)
ENDSELECT
gdImageColorTransparent(CANVAS_GD.img_current, CANVAS_GD.transparent)
gdImageGifAnimAdd(CANVAS_GD.img_current, canvas_gd_fd, 1, 0, 0, CANVAS_GD.speed, gdDisposalRestorePrevious, NULL)
CANVAS_GD.img_current = Create_New_Image()
gdImageSetThickness(CANVAS_GD.img_current, CANVAS_GD.pen_size)
gdImageDestroy(img)
DECR CANVAS_GD.frame_ctr
IF CANVAS_GD.frame_ctr = 0 THEN RETURN FALSE
RETURN TRUE
ENDFUNCTION
SUB QUIT
gdImageGifAnimEnd(canvas_gd_fd)
gdImageDestroy(CANVAS_GD.img_current)
CLOSE FILE canvas_gd_fd
END 0
END SUB
SUB GD_Callback
IF CANVAS_GD.callb <> NULL THEN CALL (*CANVAS_GD.callb)()
CALL SYNC()
END SUB
SUB CALLBACK(timeout, void* func)
CANVAS_GD.callb = func
CANVAS_GD.speed = IIF(timeout/10 < 1, 1, timeout/10)
ENDSUB
SUB FRAMES(nr)
CANVAS_GD.nr_frames = nr
CANVAS_GD.frame_ctr = nr
ENDSUB
SUB DELAY(timeout)
CANVAS_GD.speed = IIF(timeout/10 < 1, 1, timeout/10)
ENDSUB
SUB WAITKEY
IF CANVAS_GD.speed > 0 THEN
REPEAT
CALL GD_Callback()
IF WAIT(STDIN_FILENO, 10) THEN
PRINT "Stopped by key press. Frames generated: ", CANVAS_GD.nr_frames - CANVAS_GD.frame_ctr
CALL QUIT()
ENDIF
UNTIL CANVAS_GD.frame_ctr <= 0
ELSE
CALL SYNC()
ENDIF
PRINT "All done. Frames generated: ", CANVAS_GD.nr_frames
CALL QUIT()
ENDSUB
'------------------------------------------------------------------
IF NOT(Import_GD_functions()) THEN
PRINT "No GD library found! Image cannot be created."
END 1
ENDIF
' Get the font
CALL Read_Font_Data()
' Set some default values
CANVAS_GD.nr_frames = 1
CANVAS_GD.frame_ctr = 1
CANVAS_GD.speed = 100
CANVAS_GD.scaling = 1.0
CANVAS_GD.transparent = -1
CANVAS_GD.flipping = 3
CANVAS_GD.pen_size = 1
CANVAS_GD.callb = NULL
Generated by GNU Enscript 1.6.5.90.