From 3a879d9a5f407a26328ee99054e2bbd28cfb62f5 Mon Sep 17 00:00:00 2001
From: Sasha Koshka <sashakoshka@tebibyte.media>
Date: Sun, 6 Nov 2022 15:59:06 -0500
Subject: [PATCH] Mouse input works

---
 application.go          |  5 +++++
 backend.go              | 21 +++++++++++----------
 backends/pixel/pixel.go | 13 +++++++++++++
 buffer.go               |  2 ++
 examples/hello/main.go  |  6 ++++++
 5 files changed, 37 insertions(+), 10 deletions(-)

diff --git a/application.go b/application.go
index a1dca70..17a1bd2 100644
--- a/application.go
+++ b/application.go
@@ -97,3 +97,8 @@ func (application *Application) Resized () (resized bool) {
 	resized = application.backend.Resized()
 	return
 }
+
+func (application *Application) MousePosition () (x, y int) {
+	x, y = application.backend.MousePosition()
+	return
+}
diff --git a/backend.go b/backend.go
index 05832e5..39561e3 100644
--- a/backend.go
+++ b/backend.go
@@ -4,16 +4,17 @@ import "time"
 import "errors"
 
 type Backend interface {
-	Run          (callback func (application *Application)) ()
-	Await        (timeout time.Duration) (keepRunning bool)
-	Poll         ()                      (keepRunning bool)
-	SetTitle     (title string)
-	JustPressed  (button Button) (pressed  bool)
-	JustReleased (button Button) (released bool)
-	Pressed      (button Button) (pressed  bool)
-	Repeated     (button Button) (repeated bool)
-	Typed        () (text    string)
-	Resized      () (resized bool)
+	Run           (callback func (application *Application)) ()
+	Await         (timeout time.Duration) (keepRunning bool)
+	Poll          ()                      (keepRunning bool)
+	SetTitle      (title string)
+	JustPressed   (button Button) (pressed  bool)
+	JustReleased  (button Button) (released bool)
+	Pressed       (button Button) (pressed  bool)
+	Repeated      (button Button) (repeated bool)
+	Typed         () (text    string)
+	Resized       () (resized bool)
+	MousePosition () (x, y int)
 }
 
 type BackendFactory func (application *Application) (backend Backend, err error)
diff --git a/backends/pixel/pixel.go b/backends/pixel/pixel.go
index 8209b56..2c8c763 100644
--- a/backends/pixel/pixel.go
+++ b/backends/pixel/pixel.go
@@ -126,6 +126,19 @@ func (backend *Backend) Resized () (resized bool) {
 	return
 }
 
+func (backend *Backend) MousePosition () (x, y int) {
+	vector := backend.window.MousePosition()
+	x = int (
+		(vector.X - float64(backend.metrics.paddingX)) /
+		float64(backend.metrics.cellWidth))
+	y = int (
+		(backend.windowBounds.Y -
+			vector.Y -
+			float64(backend.metrics.paddingY)) /
+		float64(backend.metrics.cellHeight))
+	return
+}
+
 func (backend *Backend) draw () {
 	// didDrawing := false
 	width, height := backend.application.Size()
diff --git a/buffer.go b/buffer.go
index 5a296c8..f2c7834 100644
--- a/buffer.go
+++ b/buffer.go
@@ -65,6 +65,7 @@ func (buffer *Buffer) Size () (width, height int) {
 }
 
 func (buffer *Buffer) SetSize (width, height int) {
+	if width < 0 || height < 0 { return }
 	buffer.width   = width
 	buffer.height  = height
 	buffer.content = make([]Cell, width * height)
@@ -115,6 +116,7 @@ type DamageBuffer struct {
 }
 
 func (buffer *DamageBuffer) SetSize (width, height int) {
+	if width < 0 || height < 0 { return }
 	buffer.Buffer.SetSize(width, height)
 	buffer.clean = make([]bool, width * height)
 }
diff --git a/examples/hello/main.go b/examples/hello/main.go
index 93d8463..0623cde 100644
--- a/examples/hello/main.go
+++ b/examples/hello/main.go
@@ -47,6 +47,12 @@ func run (application *stone.Application) {
 			application.Dot.X = 0
 			application.Dot.Y = 2
 			fmt.Fprintln(application, textBuffer)
+
+		}
+
+		if application.Pressed(stone.MouseButtonLeft) {
+			x, y := application.MousePosition()
+			application.SetRune(x, y, '#')
 		}
 		
 		if !application.Await(frameDelay) { break }