KawaGeo
Joined: 27 Aug 2005
Posts: 191
Location: Calif Mountains
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 Posted: Mon Sep 05, 2005 3:43 am Post subject: Ellipse Test |
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I have coded drawEllipse function in Lua. The arguments are the same as fillRect, in addition of an extra argument, number of segments around the ellipse. The code and screenshot are given here.
NOTE: Don't use screen as an object to draw ellipses upon directly. I don't know why. Maybe Shine could explain.
| Code: |
-- ellipseTest.lua by Geo Massar, 2005 (aka Geo Massar)
PI2 = math.pi * 2
function math.round(num, dp)
local mult = 10^(dp or 0)
return math.floor(num * mult + 0.5) / mult
end
function Image:drawEllipse(x1,y1, x2,y2, segments, color)
local a = (x2-x1) / 2; local x0 = (x2+x1) / 2
local b = (y2-y1) / 2; local y0 = (y2+y1) / 2
x1, y1 = x0, y0 + b
for i = 1, segments do
x2 = math.round(x0 + a * math.sin(PI2*i/segments))
y2 = math.round(y0 + b * math.cos(PI2*i/segments))
self:drawLine(x1,y1, x2,y2, color)
x1,y1 = x2,y2
end
end
green = Color.new(0, 255, 0)
panel = Image.createEmpty(400,200)
for i = 0, 4 do
panel:drawEllipse(50*i,0, 400-50*i,200, 60, green)
end
screen:blit(40,36, panel)
screen:print(2,262, "Ellipse Test by Geo Massar, 2005 (aka KawaGeo)", green)
screen.flip()
while true do
screen.waitVblankStart()
end
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_________________
Geo Massar
Retired Engineer |
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