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Can I draw arrows on the canvas

Cheat Engine Forum Index -> Cheat Engine Lua Scripting

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.lua
Expert Cheater

Reputation: 1

Joined: 13 Sep 2018
Posts: 202

Posted: Mon Feb 22, 2021 7:37 am Post subject: Can I draw arrows on the canvas

I can draw a straight line. I want to draw it as an arrow. What should I do

Code:

if f then f.Destroy() end
f=createForm()
--f.BorderStyle='bsNone'
f.Color=0x00ffff
f.setSize(300,300)
f.Position='poDesktopCenter'
f.FormStyle='fsSystemStayOnTop'
f.tag=0
p=createLabel(f)
p.Align='alBottom'
p.font.size=15
p.caption=string.format('OnPaint： X：%s Y：%s',x,y)
f.setLayeredAttributes(0xB4,230,3,3)

local xx , yy = 0 , 0
function OnPaint(sender,xx,yy,x,y)
sender.repaint()
sender.Canvas.Pen.Color=0x00
sender.Canvas.Pen.Width=2
sender.Canvas.Brush.Color=0xff
sender.Canvas.Brush.Style=1
--sender.Canvas.ellipse(xx,yy,x,y)
--sender.Canvas.roundRect(xx,yy,x,y,16,16)
sender.Canvas.line(xx,yy,x,y)
sender.Canvas.textOut(250,50,'↑↑')
sender.Canvas.textOut(250,150,'Drag')
sender.Canvas.textOut(250,250,'↓↓')
p.caption=string.format('OnPaint： X：%s Y：%s',x,y)
end
OnPaint(f,20,180,200,60)
f.OnMouseDown=function(sender,button,x,y) xx,yy=x,y
f.tag=1
p.caption=string.format('MouePos： X：%s Y：%s',x,y)
if x>=f.Width-100 then f.dragNow() f.tag=0 end
end
f.OnMouseUp=function() f.tag=0 end
f.OnMouseMove=function(sender,x,y) if f.tag==1 then OnPaint(sender,xx,yy,x,y) end end

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Dark Byte
Site Admin

Reputation: 470

Joined: 09 May 2003
Posts: 25778
Location: The netherlands

Posted: Mon Feb 22, 2021 8:38 am Post subject:

yes, use math. I suck at it, but this seems to work somehow

Code:

local dpiscale=192/getScreenDPI()

if f then f.Destroy() end
f=createForm()
--f.BorderStyle='bsNone'
f.Color=0x00ffff
f.setSize(800*dpiscale,600*dpiscale)
f.Position='poDesktopCenter'
f.FormStyle='fsSystemStayOnTop'
f.tag=0
p=createLabel(f)
p.Align='alBottom'
p.font.size=15
p.caption=string.format('OnPaint： X：%s Y：%s',x,y)
f.setLayeredAttributes(0xB4,230,3,3)

local xx , yy = 0 , 0
function OnPaint(sender,xx,yy,x,y)
sender.repaint()
sender.Canvas.Pen.Color=0x00
sender.Canvas.Pen.Width=dpiscale*4
sender.Canvas.Brush.Color=0xff
sender.Canvas.Brush.Style=1
--sender.Canvas.ellipse(xx,yy,x,y)
--sender.Canvas.roundRect(xx,yy,x,y,16,16)
sender.Canvas.line(xx,yy,x,y)

local angle=math.atan2(yy-y,xx-x)+0.8
local angle2=math.atan2(xx-x,yy-y)+0.8

sender.Canvas.line(x,y,x+(dpiscale*20)*math.cos(angle),y+(dpiscale*20)*math.sin(angle))
sender.Canvas.line(x,y,x+(dpiscale*20)*math.sin(angle2),y+(dpiscale*20)*math.cos(angle2))

sender.Canvas.textOut(250,50,'↑↑')
sender.Canvas.textOut(250,150,'Drag')
sender.Canvas.textOut(250,250,'↓↓')
p.caption=string.format('OnPaint： X：%s Y：%s A: %s',x,y, angle)
end
OnPaint(f,20,180,200,60)
f.OnMouseDown=function(sender,button,x,y) xx,yy=x,y
f.tag=1
p.caption=string.format('MouePos： X：%s Y：%s',x,y)
if x>=f.Width-100 then f.dragNow() f.tag=0 end
end
f.OnMouseUp=function() f.tag=0 end
f.OnMouseMove=function(sender,x,y) if f.tag==1 then OnPaint(sender,xx,yy,x,y) end end

_________________

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.lua
Expert Cheater

Reputation: 1

Joined: 13 Sep 2018
Posts: 202

Posted: Mon Feb 22, 2021 9:02 am Post subject:

Dark Byte wrote:

yes, use math. I suck at it, but this seems to work somehow

Before you reply, I am testing this code, ha ha.
But there is a problem, with the mouse moving drawing there will be flashing;
And how can I draw more arrows without clearing the previous ones

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Dark Byte
Site Admin

Reputation: 470

Joined: 09 May 2003
Posts: 25778
Location: The netherlands

Posted: Mon Feb 22, 2021 9:14 am Post subject:

draw to a bitmap with the same size and afterwards draw the bitmap to the window. that will keep the arrow (and the rest) and solve the flickering else keep a list of arrow positions and draw them each time. (I still recommend a bitmap to prevent flickering) _________________ Do not ask me about online cheats. I don't know any and wont help finding them. Like my help? Join me on Patreon so i can keep helping

.lua
Expert Cheater

Reputation: 1

Joined: 13 Sep 2018
Posts: 202

Posted: Mon Feb 22, 2021 9:36 am Post subject:

Dark Byte wrote:

draw to a bitmap with the same size and afterwards draw the bitmap to the window.

that will keep the arrow (and the rest) and solve the flickering

else keep a list of arrow positions and draw them each time. (I still recommend a bitmap to prevent flickering)

I don't know how to use bitmap. Can you give me an example

Dark Byte
Site Admin

Reputation: 470

Joined: 09 May 2003
Posts: 25778
Location: The netherlands

Posted: Mon Feb 22, 2021 10:26 am Post subject:

Code:

local dpiscale=192/getScreenDPI()

if f then f.Destroy() end
if bm then bm.destroy() end

f=createForm()
bm=createBitmap()
lines={}

--f.BorderStyle='bsNone'
f.Color=0x00ffff
f.setSize(800*dpiscale,600*dpiscale)
bm.Width=f.ClientWidth
bm.Height=f.ClientHeight

f.Position='poDesktopCenter'
f.FormStyle='fsSystemStayOnTop'
f.tag=0
p=createLabel(f)
p.Align='alBottom'
p.font.size=15
p.caption=string.format('OnPaint： X：%s Y：%s',x,y)
f.setLayeredAttributes(0xB4,230,3,3)
f.OnPaint=function(sender)
f.canvas.draw(0,0,bm)
end

local xx , yy = 0 , 0
function UpdateBitmapWithTempLine(sender,xx,yy,x,y)
local i
sender.canvas.brush.color=0xffff
sender.canvas.clear()

sender.Canvas.Pen.Color=0x00
sender.Canvas.Pen.Width=dpiscale*4
sender.Canvas.Brush.Color=0xff
sender.Canvas.Brush.Style=1
local angle
local angle2

--draw the previous lines
for i=1,#lines do
local xx=lines[i].startx
local yy=lines[i].starty
local x=lines[i].stopx
local y=lines[i].stopy

sender.Canvas.line(xx,yy,x,y)
angle=math.atan2(yy-y,xx-x)+0.8
angle2=math.atan2(xx-x,yy-y)+0.8
sender.Canvas.line(x,y,x+(dpiscale*20)*math.cos(angle),y+(dpiscale*20)*math.sin(angle))
sender.Canvas.line(x,y,x+(dpiscale*20)*math.sin(angle2),y+(dpiscale*20)*math.cos(angle2))
end

--draw the temporary line
sender.Canvas.line(xx,yy,x,y)
angle=math.atan2(yy-y,xx-x)+0.8
angle2=math.atan2(xx-x,yy-y)+0.8
sender.Canvas.line(x,y,x+(dpiscale*20)*math.cos(angle),y+(dpiscale*20)*math.sin(angle))
sender.Canvas.line(x,y,x+(dpiscale*20)*math.sin(angle2),y+(dpiscale*20)*math.cos(angle2))

--draw gui
sender.Canvas.textOut(f.Width-100*dpiscale,100*dpiscale,'↑↑')
sender.Canvas.textOut(f.Width-100*dpiscale,300*dpiscale,'Drag')
sender.Canvas.textOut(f.Width-100*dpiscale,500*dpiscale,'↓↓')
p.caption=string.format('OnPaint： X：%s Y：%s A: %s',x,y, angle)

f.repaint()
end
OnPaint(f,20,180,200,60)
f.OnMouseDown=function(sender,button,x,y)
xx,yy=x,y
f.tag=1
p.caption=string.format('MouePos： X：%s Y：%s',x,y)
if x>=f.Width-100 then f.dragNow() f.tag=0 end
end
f.OnMouseUp=function(sender, button, x,y)
f.tag=0
local a=(xx-x)*(xx-x)
local b=(yy-y)*(yy-y)
local c=math.sqrt(a+b)
if c>4 then
--only save long enough lines
local line={}
line.startx=xx
line.starty=yy
line.stopx=x
line.stopy=y

table.insert(lines, line)
end
end
f.OnMouseMove=function(sender,x,y) if f.tag==1 then UpdateBitmapWithTempLine(bm,xx,yy,x,y) end end

UpdateBitmapWithTempLine(bm,0,0,0,0)

_________________

Do not ask me about online cheats. I don't know any and wont help finding them.

Like my help? Join me on Patreon so i can keep helping

.lua
Expert Cheater

Reputation: 1

Joined: 13 Sep 2018
Posts: 202

Posted: Mon Feb 22, 2021 10:56 am Post subject:

Dark Byte wrote:

Wow, that's great. That's what I want. Thank you very much. Very Happy

Is it possible to clear one of the arrows? Or destroy it in the reverse order of the original drawing, because I see that a table is used in the code, and I wonder if it can be used to expand it

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