[devtools] Add Spr tool

Allow user drawing sprites on the paused game. Let user select the
sprite with new devtool and draw the sprite on the screen.

This tool support moving the entire sprite-sheet. To do so, please use
the middle mouse button.

Author: elgopher

devtools/internal/icons/icons.go

@@ -20,6 +20,7 @@ const (
 	RectFillTool = 5
 	CircTool     = 6
 	CircFillTool = 7
+	SprTool      = 8
 )
 
 //go:embed icons.png

devtools/internal/icons/icons.png

@@ -0,0 +1,108 @@
+package inspector
+
+import (
+	"fmt"
+
+	"github.com/elgopher/pi"
+	"github.com/elgopher/pi/devtools/internal/icons"
+	"github.com/elgopher/pi/devtools/internal/snapshot"
+)
+
+type Spr struct {
+	icon byte
+	mode sprMode
+}
+
+type sprMode interface {
+	update(*Spr)
+	draw()
+}
+
+func (l *Spr) Update() {
+	l.mode.update(l)
+}
+
+func (l *Spr) Draw() {
+	l.mode.draw()
+}
+
+func (l *Spr) Icon() byte {
+	return l.icon
+}
+
+type sprSelectionMode struct {
+	lastMousePos pi.Position
+	camera       pi.Position
+}
+
+func (m *sprSelectionMode) update(spr *Spr) {
+	if pi.MouseBtn(pi.MouseMiddle) {
+		zero := pi.Position{}
+		if m.lastMousePos == zero {
+			m.lastMousePos = pi.MousePos
+		}
+		dx := m.lastMousePos.X - pi.MousePos.X
+		dy := m.lastMousePos.Y - pi.MousePos.Y
+
+		m.camera.X -= dx
+		minCameraX := -(pi.SprSheet().Width() - pi.Scr().Width())
+		m.camera.X = pi.MidInt(minCameraX, m.camera.X, 0)
+
+		m.camera.Y -= dy
+		minCameraY := -(pi.SprSheet().Height() - pi.Scr().Height())
+		m.camera.Y = pi.MidInt(minCameraY, m.camera.Y, 0)
+
+		m.lastMousePos = pi.MousePos
+	}
+
+	if !pi.MouseBtn(pi.MouseMiddle) {
+		m.lastMousePos.Reset()
+	}
+
+	if pi.MouseBtnp(pi.MouseLeft) {
+		spr.mode = &sprDrawingMode{selectedSprite: m.spriteNo(pi.MousePos)}
+	}
+}
+
+func (m *sprSelectionMode) draw() {
+	pi.SprSheet().Copy(0, 0, pi.SprSheet().Width(), pi.SprSheet().Height(), pi.Scr(), m.camera.X, m.camera.Y)
+
+	mouseX, mouseY := pi.MousePos.X, pi.MousePos.Y
+
+	icons.Draw(mouseX, mouseY, FgColor, icons.Pointer)
+
+	screen := pi.Scr()
+	var barY int
+	if !isBarOnTop {
+		barY = screen.Height() - 7
+	}
+
+	pi.RectFill(0, barY, screen.Width(), barY+6, BgColor)
+
+	spriteNo := fmt.Sprintf("SRITE %d", m.spriteNo(pi.MousePos))
+	pi.Print(spriteNo, 1, barY+1, FgColor)
+}
+
+func (m *sprSelectionMode) spriteNo(mousePos pi.Position) int {
+	x := mousePos.X - m.camera.X
+	y := mousePos.Y - m.camera.Y
+	cellX := x / 8
+	cellY := y / 8
+	return cellY*(pi.SprSheet().Width()/8) + cellX
+}
+
+type sprDrawingMode struct {
+	selectedSprite int
+}
+
+func (m *sprDrawingMode) update(*Spr) {
+	if pi.MouseBtnp(pi.MouseLeft) {
+		fmt.Printf("pi.Spr(%d, %d, %d)\n", m.selectedSprite, pi.MousePos.X, pi.MousePos.Y)
+		snapshot.Take()
+	}
+}
+
+func (m *sprDrawingMode) draw() {
+	mouseX, mouseY := pi.MousePos.X, pi.MousePos.Y
+	pi.Spr(m.selectedSprite, mouseX, mouseY)
+}

devtools/internal/inspector/spr.go

@@ -50,6 +50,11 @@ func selectTool(icon byte) {
 			draw: drawCirc("CircFill", pi.CircFill),
 			icon: icons.CircFillTool,
 		}
+	case icons.SprTool:
+		tool = &Spr{
+			icon: icons.SprTool,
+			mode: &sprSelectionMode{},
+		}
 	}
 }
 

devtools/internal/inspector/tool.go

@@ -9,7 +9,7 @@ import (
 	"github.com/elgopher/pi/key"
 )
 
-const toolbarWidth = 28
+const toolbarWidth = 32
 const toolbarHeight = 4
 
 var toolbar Toolbar
@@ -73,7 +73,7 @@ func (t *Toolbar) draw() {
 		y := t.pos.Y
 		pi.RectFill(x, y, x+toolbarWidth, y+toolbarHeight, BgColor)
 		icons.Draw(x+1, y+1, FgColor,
-			icons.MeasureTool, icons.SetTool, icons.LineTool, icons.RectTool, icons.RectFillTool, icons.CircTool, icons.CircFillTool)
+			icons.MeasureTool, icons.SetTool, icons.LineTool, icons.RectTool, icons.RectFillTool, icons.CircTool, icons.CircFillTool, icons.SprTool)
 
 		if t.toolHighlighted > 0 {
 			toolX := x + int((t.toolHighlighted-1)*4)

devtools/internal/inspector/toolbar.go

@@ -41,7 +41,8 @@
       * [ ] zoom-in, zoom-out
       * [ ] drawing on the screen using Pi functions
         * [x] Set, shapes
-        * [ ] Spr, Print
+        * [x] Spr
+        * [ ] Print
     * [x] **scripting/REPL** - write Go code **live** when the game is running
     * [ ] palette inspector
       * [ ] display, draw palette