i was thinking about making the hands a bit more interesting so i wrote this to put into the chrono script either above or below the main function
Code:
--this function caluculates coordinates for a point around a circle
function pt(px,py,prad,pdeg)--px,py=center coordinates for circle, prad=radius,pdeg is position in degrees, 0 is top
local ppo=(math.pi/180)*pdeg
local px1=px+prad*(math.sin(ppo))
local py1=py-prad*(math.cos(ppo))
return px1,py1--returns coordinates, use in main function like this, x,y=pt(px,py,prad,pdeg)
end
--this function draws hands
function hands(clock_centerx,clock_centery,degrees,length,hand_center_width,hand_mid_width,hand_end_width,distance_to_mid)
--draw_middle
--calc start point
xs,ys=pt(clock_centerx,clock_centery,hand_center_width,degrees-90)
cairo_move_to(cr,xs,ys)
x1,y1=pt(clock_centerx,clock_centery,length*distance_to_mid,degrees-(hand_mid_width/2))
cairo_line_to (cr,x1,y1)
x2,y2=pt(clock_centerx,clock_centery,length,degrees)
cairo_arc(cr,x2,y2,hand_end_width,(degrees+180)*(math.pi/180),(degrees)*(math.pi/180))
--cairo_line_to (cr,x2,y2)
x3,y3=pt(clock_centerx,clock_centery,length*distance_to_mid,degrees+(hand_mid_width/2))
cairo_line_to (cr,x3,y3)
--calc end point
xe,ye=pt(clock_centerx,clock_centery,hand_center_width,degrees+90)
cairo_line_to (cr,xe,ye)
cairo_arc(cr,clock_centerx,clock_centery,hand_center_width,(degrees)*(math.pi/180),(degrees+180)*(math.pi/180))
cairo_fill(cr)
end
Code:
-- DRAW HOUR HAND
-- get hours minutes seconds as just seconds and draw it
hsecs=h_to_s+m_to_s+seconds
-- calculate degrees for each second
hsec_degs=hsecs*(360/(60*60*clock_type_E))-- use equation ~ eliminate decimals
-- set radius to calculate hand points
radius=hh_length_E
-- set start line coordinates, the center of the circle
cairo_move_to (cr,clock_centerx,clock_centery)
-- calculate coordinates for end of minute hand
point=(math.pi/180)*hsec_degs
x=0+radius*(math.sin(point))
y=0-radius*(math.cos(point))
-- describe the line we will draw
cairo_line_to (cr,clock_centerx+x,clock_centery+y)
-- set up line attributes and draw line
cairo_set_line_width (cr,hh_width_E)
cairo_set_source_rgba (cr,hhr,hhg,hhb,hha)
cairo_set_line_cap (cr, hh_cap)
cairo_stroke (cr)
Code:
-- DRAW HOUR HAND
-- get hours minutes seconds as just seconds
hsecs=h_to_s+m_to_s+seconds
-- calculate degrees for each second
hsec_degs=hsecs*(360/(60*60*clock_type_A))-- use equation ~ eliminate decimals
-- set radius to calculate hand points
-- set up line attributes
cairo_set_line_width (cr,hh_width_A)
cairo_set_source_rgba (cr,hhr,hhg,hhb,hha)
cairo_set_line_cap (cr, hh_cap)
--NEW HAND DRAWING CODE ##################################################
--call hand drawing function
hands(
clock_centerx,--string or coodinate for clock center x
clock_centery,--string or coodinate for clock center y
hsec_degs,--string or value for hand degrees
hh_length_A,--string or value for hand length (radius)
2,--set hand center width in pixels
10,--set hand mid width in degrees
0,--set hand end width in pixels, 0=a point
0.8--number from 0 to 1 as a propotion of total hand length, ie 0.5 is exact middle distance
)
--#########################################################################
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Originally Posted by rolypolycat
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