Modified codes

Author: shahfarhadreza

README.md

@@ -3,8 +3,13 @@ GoPaint is a paint program written in Go similar to the Windows 10's built-in dr
 
 I started leanring Go programming language recently and I wanted to make a complete application or maybe like clone of another application. So I ended up creating this paint program. Actually this program is my first ever Go project and I'm glad to share it with everyone :D
 
-This is only an alpha which means it probably has many buggs and not so stable. I will try to improve the codes over time and if anyone else want to help improving the codes, you are welcomed :) 
+This is only an alpha which means it probably has many buggs and not so stable. I will try to improve the codes over time and if anyone else want to help improving the codes, you are welcomed.
 
+Lots of techniques that I used in order to implement various features of the application is kinda hardcoded and I believe those stufs can be done in more easier ways but to be very honest I had very fun making this project and I was kinda experimenting with the codes and techniques. In the very beginning of making this project I only planned making a small clone of the Windows 10 paint then I ended up experimenting with it. For example, for the Text Tool, I implemented my own text editing system (still incomplete) instead of using a text edit control from windows api. But again, I had fun doing it and I learned a lot from it. Hope you guys will find it helpful too. 
+
+This paint application is mainly targated for windows since I used all the native windows api functions and gdi32, gdi+ for all the graphical stuffs. 
+
+Any kind of suggestions are welcomed!
 
 ![preview](images/preview.jpg)
 

__debug_bin

@@ -35,19 +35,19 @@ type DrawingCanvas struct {
 
 func NewDrawingCanvas(parent Window) *DrawingCanvas {
 	canvas := &DrawingCanvas{Window: NewWindow()}
-	canvas.init(parent)
+	canvas.Init(parent)
 	return canvas
 }
 
-func (canvas *DrawingCanvas) init(parent Window) {
+func (canvas *DrawingCanvas) Init(parent Window) {
 	logInfo("initializing canvas...")
 	canvas.firstMove = true
 	canvas.gridPen = NewDashPen(1, NewRgb(120, 120, 120))
 	canvas.Create("", win.WS_CHILD|win.WS_VISIBLE|win.WS_CLIPCHILDREN, 10, 10, 10, 10, parent)
-	canvas.SetPaintEventHandler(canvas.paint)
-	canvas.SetMouseMoveEventHandler(canvas.mouseMove)
-	canvas.SetMouseDownEventHandler(canvas.mouseDown)
-	canvas.SetMouseUpEventHandler(canvas.mouseUp)
+	canvas.SetPaintEventHandler(canvas.Paint)
+	canvas.SetMouseMoveEventHandler(canvas.MouseMove)
+	canvas.SetMouseDownEventHandler(canvas.MouseDown)
+	canvas.SetMouseUpEventHandler(canvas.MouseUp)
 	canvas.SetMouseWheelEventHandler(func(e *MouseWheelEvent) {
 		work := mainWindow.workspace
 		if e.WheelDelta > 0 {
@@ -72,8 +72,8 @@ func (canvas *DrawingCanvas) init(parent Window) {
 			tool.keyPressEvent(&e)
 		}
 	})
-	canvas.SetSetCursorEventHandler(canvas.updateCursor)
-	canvas.SetResizeEventHandler(canvas.onResize)
+	canvas.SetSetCursorEventHandler(canvas.UpdateCursor)
+	canvas.SetResizeEventHandler(canvas.OnResize)
 	logInfo("Done initializing canvas")
 }
 
@@ -97,7 +97,7 @@ func (canvas *DrawingCanvas) Dispose() {
 	}
 }
 
-func (canvas *DrawingCanvas) updateCursor() bool {
+func (canvas *DrawingCanvas) UpdateCursor() bool {
 	tool := mainWindow.tools.GetCurrentTool()
 	if tool != nil {
 		var winpt win.POINT
@@ -138,7 +138,7 @@ func (canvas *DrawingCanvas) NewImage(width, height int) {
 	}
 	canvas.image = newImage
 	canvas.SetSize(width, height)
-	canvas.updateStatus()
+	canvas.UpdateStatus()
 }
 
 func (canvas *DrawingCanvas) Resize(width, height int) {
@@ -154,7 +154,7 @@ func (canvas *DrawingCanvas) Resize(width, height int) {
 	// We allocate new data with given new size
 	// then we copy/draw the old data/image into it
 	newImage := NewDrawingImage(width, height)
-	color := getColorBackground()
+	color := GetColorBackground()
 	newImage.Clear(&color)
 
 	rect2 := canvas.image.Bounds()
@@ -168,7 +168,7 @@ func (canvas *DrawingCanvas) Resize(width, height int) {
 	canvas.image = newImage
 
 	canvas.SetSize(width, height)
-	canvas.updateStatus()
+	canvas.UpdateStatus()
 }
 
 func (canvas *DrawingCanvas) OpenImage(filename string) bool {
@@ -220,7 +220,7 @@ func (canvas *DrawingCanvas) OpenImage(filename string) bool {
 	}
 	canvas.image = newImage
 	canvas.SetSize(width, height)
-	canvas.updateStatus()
+	canvas.UpdateStatus()
 	canvas.Repaint()
 	log.Println("Done opening image")
 	return true
@@ -247,7 +247,7 @@ func (canvas *DrawingCanvas) SaveImage(filePath string) bool {
 	return true
 }
 
-func (canvas *DrawingCanvas) updateStatus() {
+func (canvas *DrawingCanvas) UpdateStatus() {
 	size := canvas.GetSize()
 	scz := mainWindow.statusCanvasSize
 	if scz != nil {
@@ -263,7 +263,7 @@ func (canvas *DrawingCanvas) updateStatus() {
 	}
 }
 
-func (canvas *DrawingCanvas) updateMousePosStatus() {
+func (canvas *DrawingCanvas) UpdateMousePosStatus() {
 	status := mainWindow.statusMousePos
 	wndRect := canvas.GetWindowRect()
 	ptScreen := app.GetCursorPos()
@@ -276,7 +276,7 @@ func (canvas *DrawingCanvas) updateMousePosStatus() {
 	}
 }
 
-func (canvas *DrawingCanvas) mouseDown(pt *Point, mbutton int) {
+func (canvas *DrawingCanvas) MouseDown(pt *Point, mbutton int) {
 	win.SetCapture(canvas.GetHandle())
 	tool := mainWindow.tools.GetCurrentTool()
 	if canvas.firstMove {
@@ -297,7 +297,7 @@ func (canvas *DrawingCanvas) mouseDown(pt *Point, mbutton int) {
 	canvas.lastPt = *pt
 }
 
-func (canvas *DrawingCanvas) mouseUp(pt *Point, mbutton int) {
+func (canvas *DrawingCanvas) MouseUp(pt *Point, mbutton int) {
 	tool := mainWindow.tools.GetCurrentTool()
 	if canvas.firstMove {
 		canvas.lastPt = *pt
@@ -317,7 +317,7 @@ func (canvas *DrawingCanvas) mouseUp(pt *Point, mbutton int) {
 	win.ReleaseCapture()
 }
 
-func (canvas *DrawingCanvas) mouseMove(mousepoint *Point, mbutton int) {
+func (canvas *DrawingCanvas) MouseMove(mousepoint *Point, mbutton int) {
 	pt := *mousepoint
 	tool := mainWindow.tools.GetCurrentTool()
 	if canvas.firstMove {
@@ -333,12 +333,12 @@ func (canvas *DrawingCanvas) mouseMove(mousepoint *Point, mbutton int) {
 		canvas:  canvas,
 	}
 	tool.mouseMoveEvent(&e)
-	canvas.updateMousePosStatus()
+	canvas.UpdateMousePosStatus()
 	canvas.RepaintVisible()
 	canvas.lastPt = pt
 }
 
-func (canvas *DrawingCanvas) onResize(rect *Rect) {
+func (canvas *DrawingCanvas) OnResize(rect *Rect) {
 	logInfo("canvas resize...")
 	if canvas.mhdc != 0 {
 		win.DeleteDC(canvas.mhdc)
@@ -408,7 +408,7 @@ func (canvas *DrawingCanvas) RepaintVisible() {
 	canvas.InvalidateRect(&rect, false)
 }
 
-func (canvas *DrawingCanvas) drawGridLines(g *Graphics, rect *Rect, rcVisible *Rect) {
+func (canvas *DrawingCanvas) DrawGridLines(g *Graphics, rect *Rect, rcVisible *Rect) {
 	g.SelectObject(canvas.gridPen)
 	for x := 10; x <= rect.Right; x += 10 {
 		if x > rcVisible.Left && x < rcVisible.Right {
@@ -422,7 +422,7 @@ func (canvas *DrawingCanvas) drawGridLines(g *Graphics, rect *Rect, rcVisible *R
 	}
 }
 
-func (canvas *DrawingCanvas) paint(g *Graphics, rect *Rect) {
+func (canvas *DrawingCanvas) Paint(g *Graphics, rect *Rect) {
 	if canvas.context == nil {
 		return
 	}
@@ -440,7 +440,7 @@ func (canvas *DrawingCanvas) paint(g *Graphics, rect *Rect) {
 	//image.memdc, rcVisible.Left, rcVisible.Top, rcVisible.Width(), rcVisible.Height())
 
 	if mainWindow.bShowGridlines.IsToggled() {
-		canvas.drawGridLines(gmem, rect, &rcVisible)
+		canvas.DrawGridLines(gmem, rect, &rcVisible)
 	}
 
 	var winpt win.POINT

canvas.go

@@ -20,11 +20,11 @@ type PropertiesDialog struct {
 
 func NewResizeDialog(parent Window) *ResizeDialog {
 	dlg := &ResizeDialog{Dialog: NewDialog()}
-	dlg.init(parent)
+	dlg.Init(parent)
 	return dlg
 }
 
-func (dlg *ResizeDialog) init(parent Window) {
+func (dlg *ResizeDialog) Init(parent Window) {
 	logInfo("Initialize Resize dialog...")
 	dlg.Dialog.Initialize(parent, "Resize", 300, 320)
 
@@ -53,11 +53,11 @@ func (dlg *ResizeDialog) init(parent Window) {
 
 func NewPropertiesDialog(parent Window) *PropertiesDialog {
 	dlg := &PropertiesDialog{Dialog: NewDialog()}
-	dlg.init(parent)
+	dlg.Init(parent)
 	return dlg
 }
 
-func (dlg *PropertiesDialog) init(parent Window) {
+func (dlg *PropertiesDialog) Init(parent Window) {
 	logInfo("Initialize Properties dialog...")
 	dlg.Dialog.Initialize(parent, "Image Properties", 340, 360)
 

dialogs.go

@@ -85,40 +85,7 @@ func (image *DrawingImage) HasFilePath() bool {
 
 func (image *DrawingImage) Clear(color *gdiplus.Color) {
 	image.context.Clear(color)
-	/*
-		//i := 0
-		//bitmapArray := di.Pix
-		for y := di.Bounds().Min.Y; y != di.Bounds().Max.Y; y++ {
-			for x := di.Bounds().Min.X; x != di.Bounds().Max.X; x++ {
-				di.Set(x, y, c.AsRGBA())
-
-					//bitmapArray[i+0] = 255
-					//bitmapArray[i+1] = 0
-					//bitmapArray[i+2] = 0
-					//bitmapArray[i+3] = 255
-					//i += 4
-			}
-		}
-	*/
-}
-
-/*
-
-func (image *DrawingImage) AquireData(im image.Image) {
-	i := 0
-	bitmapArray := image.Pix
-	for y := im.Bounds().Min.Y; y != im.Bounds().Max.Y; y++ {
-		for x := im.Bounds().Min.X; x != im.Bounds().Max.X; x++ {
-			r, g, b, a := im.At(x, y).RGBA()
-			bitmapArray[i+0] = byte(b >> 8)
-			bitmapArray[i+1] = byte(g >> 8)
-			bitmapArray[i+2] = byte(r >> 8)
-			bitmapArray[i+3] = byte(a >> 8)
-			i += 4
-		}
-	}
 }
-*/
 
 func (image *DrawingImage) SizeOnDisk() (asString string, available bool) {
 	if image.sizeOnDisk > 0 {
@@ -142,84 +109,3 @@ func (image *DrawingImage) LastSaved() (asString string, available bool) {
 	}
 	return "", false
 }
-
-// DrawImage draws image
-func DrawImage(g *Graphics, image *DrawingImage, x, y int) {
-	/*
-		width := 100
-		height := 100
-
-		var bi win.BITMAPV5HEADER
-		bi.BiSize = uint32(unsafe.Sizeof(bi))
-		bi.BiWidth = int32(width)
-		bi.BiHeight = -int32(height)
-		bi.BiPlanes = 1
-		bi.BiBitCount = 32
-		bi.BiCompression = win.BI_BITFIELDS
-		// The following mask specification specifies a supported 32 BPP
-		// alpha format for Windows XP.
-		bi.BV4RedMask = 0x00FF0000
-		bi.BV4GreenMask = 0x0000FF00
-		bi.BV4BlueMask = 0x000000FF
-		bi.BV4AlphaMask = 0xFF000000
-
-		hdc := win.GetDC(0)
-		defer win.ReleaseDC(0, hdc)
-
-		var lpBits unsafe.Pointer
-		// Create the DIB section with an alpha channel.
-		hbitmap := win.CreateDIBSection(hdc, &bi.BITMAPINFOHEADER, win.DIB_RGB_COLORS, &lpBits, 0, 0)
-
-		bitsPerPixel := 32
-		length := ((width*bitsPerPixel + 31) / 32) * 4 * height
-		// Slice memory layout
-		var sl = struct {
-			addr uintptr
-			len  int
-			cap  int
-		}{uintptr(lpBits), length, length}
-
-		// Use unsafe to turn sl into a []byte.
-		bitmapArray := *(*[]byte)(unsafe.Pointer(&sl))
-
-		i := 0
-		for y := 0; y != height; y++ {
-			for x := 0; x != width; x++ {
-				bitmapArray[i+3] = 255
-				bitmapArray[i+2] = 255
-				bitmapArray[i+1] = 0
-				bitmapArray[i+0] = 0
-				i += 4
-			}
-		}
-
-		memDC := win.CreateCompatibleDC(g.GetHDC())
-		win.SelectObject(memDC, win.HGDIOBJ(hbitmap))
-
-		gbitmap := NewGraphics(memDC)
-		gbitmap.DrawLine(10, 10, 100, 100, Rgb(0, 255, 0))
-
-		win.BitBlt(g.GetHDC(), 0, 0, int32(width), int32(height), memDC, 0, 0, win.SRCCOPY)
-
-		win.DeleteObject(win.HGDIOBJ(hbitmap))
-	*/
-
-	var bf win.BLENDFUNCTION
-	bf.BlendOp = AC_SRC_OVER
-	bf.BlendFlags = 0
-	bf.SourceConstantAlpha = 255
-	bf.AlphaFormat = win.AC_SRC_ALPHA
-
-	memDC := win.CreateCompatibleDC(0)
-	prevObj := win.SelectObject(memDC, win.HGDIOBJ(image.hbitmap))
-
-	width := int32(image.Width())
-	height := int32(image.Height())
-
-	//win.BitBlt(g.GetHDC(), 0, 0, int32(width), int32(height), memDC, 0, 0, win.SRCCOPY)
-	win.AlphaBlend(g.GetHDC(), int32(x), int32(y), width, height, memDC, 0, 0, width, height, bf)
-
-	win.SelectObject(memDC, prevObj)
-	win.DeleteDC(memDC)
-
-}