✨ Some basic ui things

pkg/internal/land/object_ui.go

@@ -0,0 +1,21 @@
+package land
+
+import "github.com/veandco/go-sdl2/sdl"
+
+type BaseUIObject struct {
+	BaseObject
+
+	Position Vector2D
+	Size     Vector2D
+}
+
+func (p *BaseUIObject) Draw(pen *sdl.Renderer) {
+}
+
+func (p *BaseUIObject) GetPosition() Vector2D {
+	return p.Position
+}
+
+func (p *BaseUIObject) GetSize() Vector2D {
+	return p.Size
+}

pkg/internal/land/ui/button.go

@@ -0,0 +1,61 @@
+package ui
+
+import (
+	"git.solsynth.dev/highland/codingland/pkg/internal/land"
+	"github.com/veandco/go-sdl2/sdl"
+	"github.com/veandco/go-sdl2/ttf"
+	"log"
+)
+
+type ButtonObject struct {
+	land.BaseUIObject
+
+	Label        string
+	Font         *ttf.Font
+	OnClickEvent func(mousePos land.Vector2D)
+}
+
+func (p *ButtonObject) Draw(pen *sdl.Renderer) {
+	var borderWidth int32 = 2
+
+	pen.SetDrawColor(255, 255, 255, 255)
+	pen.FillRect(&sdl.Rect{
+		X: int32(p.Position.X),
+		Y: int32(p.Position.Y),
+		W: int32(p.Size.X),
+		H: int32(p.Size.Y),
+	})
+	pen.SetDrawColor(0, 0, 0, 255)
+	pen.FillRect(&sdl.Rect{
+		X: int32(p.Position.X) + borderWidth/2,
+		Y: int32(p.Position.Y) + borderWidth/2,
+		W: int32(p.Size.X) - borderWidth,
+		H: int32(p.Size.Y) - borderWidth,
+	})
+
+	surface, err := p.Font.RenderUTF8Blended(p.Label, sdl.Color{R: 255, G: 255, B: 255, A: 255})
+	if err != nil {
+		log.Printf("Failed to render text: %s", err)
+		return
+	}
+	defer surface.Free()
+
+	texture, err := pen.CreateTextureFromSurface(surface)
+	if err != nil {
+		log.Printf("Failed to create texture: %s", err)
+		return
+	}
+	defer texture.Destroy()
+
+	textRect := sdl.Rect{
+		X: int32(p.BaseUIObject.Position.X),
+		Y: int32(p.BaseUIObject.Position.Y),
+		W: surface.W,
+		H: surface.H,
+	}
+	pen.Copy(texture, nil, &textRect)
+}
+
+func (p *ButtonObject) OnClick(mousePos land.Vector2D) {
+	p.OnClickEvent(mousePos)
+}

pkg/main.go

@@ -3,7 +3,9 @@ package main
 import (
 	"git.solsynth.dev/highland/codingland/pkg/internal/entities"
 	"git.solsynth.dev/highland/codingland/pkg/internal/land"
+	"git.solsynth.dev/highland/codingland/pkg/internal/land/ui"
 	"git.solsynth.dev/highland/codingland/pkg/internal/tiles"
+	"github.com/veandco/go-sdl2/ttf"
 	"log"
 	"runtime"
 	"time"
@@ -26,6 +28,11 @@ func main() {
 	}
 	defer sdl.Quit()
 
+	if err := ttf.Init(); err != nil {
+		log.Fatalf("Failed to initialize SDL ttf: %s", err)
+	}
+	defer ttf.Quit()
+
 	window, err := sdl.CreateWindow("CodingLand", sdl.WINDOWPOS_UNDEFINED, sdl.WINDOWPOS_UNDEFINED, windowWidth, windowHeight, sdl.WINDOW_SHOWN)
 	if err != nil {
 		log.Fatalf("Failed to create window: %s", err)
@@ -38,7 +45,26 @@ func main() {
 	}
 	defer renderer.Destroy()
 
+	sdl.SetHint(sdl.HINT_RENDER_SCALE_QUALITY, "1")
+
+	font, err := ttf.OpenFont("assets/fonts/NotoSans.ttf", 12)
+	if err != nil {
+		log.Fatalf("Failed to open font: %s", err)
+	}
+	defer font.Close()
+
 	root := land.NewRootObject()
+	root.AddChild(&ui.ButtonObject{
+		BaseUIObject: land.BaseUIObject{
+			Position: land.Vector2D{X: windowWidth/2 - 60, Y: windowHeight/2 - 25},
+			Size:     land.Vector2D{X: 120, Y: 50},
+		},
+		Label: "Hello, World!",
+		Font:  font,
+		OnClickEvent: func(_ land.Vector2D) {
+			sdl.ShowSimpleMessageBox(sdl.MESSAGEBOX_INFORMATION, "You clicked me!", "你惊扰了古希腊掌控按钮的神", window)
+		},
+	})
 	root.AddChild(&entities.Player{
 		Position: land.Vector2D{X: windowWidth/2 - 25, Y: windowHeight/2 - 25},
 		Size:     land.Vector2D{X: 50, Y: 50},