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Fix mouse event coordinates on high-DPI displays #169

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Merged
timzifer merged 1 commit into from
Apr 21, 2026
+8 −1
Merged

Fix mouse event coordinates on high-DPI displays #169

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9 changes: 8 additions & 1 deletion platform/web/web.go
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Original file line number Diff line number Diff line change
Expand Up @@ -238,6 +238,11 @@ func (p *Platform) registerEventListeners(cb platform.Callbacks) {
if w <= 0 || h <= 0 {
return
}
dpr := p.window.Get("devicePixelRatio").Float()
if dpr < 1 {
dpr = 1
}
p.dpr = dpr
p.width = w
p.height = h
p.fbWidth = int(float64(w) * p.dpr)
Expand Down Expand Up @@ -265,7 +270,9 @@ func (p *Platform) addEventListener(target js.Value, event string, handler func(
}

func (p *Platform) canvasPos(e js.Value) (float32, float32) {
return float32(e.Get("offsetX").Float()), float32(e.Get("offsetY").Float())
x := e.Get("offsetX").Float() * p.dpr
y := e.Get("offsetY").Float() * p.dpr
return float32(x), float32(y)
}

func (p *Platform) Destroy() {
Expand Down
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