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.lua
Expert Cheater
 Reputation: 1
Joined: 13 Sep 2018
Posts: 203
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 Posted: Fri Jun 07, 2019 4:27 am Post subject: about Canvas.clear()--How to clear the specified area |
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| Code: | if f then f.Destroy() end
f=createForm()
f.BorderStyle='bsNone'
f.Color=0xEDDCBC
f.setSize(300,300)
f.Position='poDesktopCenter'
f.FormStyle='fsSystemStayOnTop'
p=createPanel(f)
p.setSize(150,200)
p.caption="Can't clean up"
function OnPaint(sender,x,y)
local x2,y2=x,y
local cp=sender.Canvas.Pen
local cnv=sender.Canvas
local line=sender.Canvas.Line
local clear=sender.Canvas.clear
for j=100,1,-1 do
cp.Color=0xff*j
for i=1,80-j do
cp.Width=i-1
--line(i,i,i,i)
line(x2,y2,x2,y2)
end
end
cnv.clear(x2,y2,x2,y2)
end
f.setLayeredAttributes(0xB4B4B4,230,3,3)
f.OnMouseDown=function(sender,button,x,y) f.dragNow() OnPaint(sender,x,y) end
p.OnMouseDown=function(sender,button,x,y) f.dragNow() OnPaint(sender,x,y) end |
I want to clear only the drawn area, not the whole area.
What should I do?
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daspamer
Grandmaster Cheater Supreme
 Reputation: 54
Joined: 13 Sep 2011
Posts: 1588
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| Posted: Fri Jun 07, 2019 6:32 am Post subject: |
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Either use pen and fillRect at specific area, or just use bitmap redraw specific area you wish to update from bitmap.
And since you asking how to keep panel content, simply call p.repaint() to repaint the panel.
| Code: |
p.OnMouseDown=function(sender,button,x,y) f.dragNow() OnPaint(sender,x,y);sender.repaint();end |
_________________
I'm rusty and getting older, help me re-learn lua. |
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.lua
Expert Cheater
Reputation: 1
Joined: 13 Sep 2018
Posts: 203
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| Posted: Fri Jun 07, 2019 9:14 am Post subject: |
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| DaSpamer wrote: | Either use pen and fillRect at specific area, or just use bitmap redraw specific area you wish to update from bitmap.
And since you asking how to keep panel content, simply call p.repaint() to repaint the panel. |
Wow! You're great. Thank you for your guidance.
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