New example : shapes/draw_circle_sector

examples/shapes/draw_circle_sector/main.go

@@ -0,0 +1,88 @@
+/*******************************************************************************************
+ *
+ *   raylib [shapes] example - draw circle sector (with gui options)
+ *
+ *   Example originally created with raylib 2.5, last time updated with raylib 2.5
+ *
+ *   Example contributed by Vlad Adrian (@demizdor) and reviewed by Ramon Santamaria (@raysan5)
+ *
+ *   Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,
+ *   BSD-like license that allows static linking with closed source software
+ *
+ *   Copyright (c) 2018-2024 Vlad Adrian (@demizdor) and Ramon Santamaria (@raysan5)
+ *
+ ********************************************************************************************/
+package main
+
+import (
+	"fmt"
+	"math"
+
+	gui "github.com/gen2brain/raylib-go/raygui"
+	rl "github.com/gen2brain/raylib-go/raylib"
+)
+
+const (
+	screenWidth  = 800
+	screenHeight = 450
+)
+
+func main() {
+	rl.InitWindow(screenWidth, screenHeight, "raylib [shapes] example - draw circle sector")
+
+	center := rl.Vector2{X: (float32(screenWidth) - 300) / 2.0, Y: float32(screenHeight / 2.0)}
+	var outerRadius, startAngle, endAngle, segments, minSegments float32 = 180.0, 0.0, 180.0, 10.0, 4
+
+	rl.SetTargetFPS(60) // Set our game to run at 60 frames-per-second
+
+	// Main game loop
+	for !rl.WindowShouldClose() { // Detect window close button or ESC key
+		// Draw
+		rl.BeginDrawing()
+
+		rl.ClearBackground(rl.RayWhite)
+
+		rl.DrawLine(500, 0, 500, screenWidth, rl.Fade(rl.LightGray, 0.6))
+		rl.DrawRectangle(500, 0, screenWidth-500, screenHeight, rl.Fade(rl.LightGray, 0.3))
+
+		rl.DrawCircleSector(center, outerRadius, startAngle, endAngle, int32(segments), rl.Fade(rl.Maroon, 0.3))
+		rl.DrawCircleSectorLines(center, outerRadius, startAngle, endAngle, int32(segments), rl.Fade(rl.Maroon, 0.6))
+
+		// Draw GUI controls
+		r := rl.Rectangle{X: 600, Y: 40, Width: 120, Height: 20}
+		msg := fmt.Sprintf("%.2f", startAngle)
+		startAngle = gui.Slider(r, "StartAngle", msg, startAngle, 0, 720)
+
+		r = rl.Rectangle{X: 600, Y: 70, Width: 120, Height: 20}
+		msg = fmt.Sprintf("%.2f", endAngle)
+		endAngle = gui.Slider(r, "EndAngle", msg, endAngle, 0, 720)
+
+		r = rl.Rectangle{X: 600, Y: 140, Width: 120, Height: 20}
+		msg = fmt.Sprintf("%.2f", outerRadius)
+		outerRadius = gui.Slider(r, "Radius", msg, outerRadius, 0, 200)
+
+		r = rl.Rectangle{X: 600, Y: 170, Width: 120, Height: 20}
+		msg = fmt.Sprintf("%.2f", segments)
+		segments = gui.Slider(r, "Segments", msg, segments, 0, 100)
+
+		minSegments = calculateMinSegments(startAngle, endAngle)
+		text := "MODE: AUTO"
+		color := rl.DarkGray
+		if segments >= minSegments {
+			text = "MODE: MANUAL"
+			color = rl.Maroon
+		}
+		rl.DrawText(text, 600, 200, 10, color)
+
+		rl.DrawFPS(10, 10)
+
+		rl.EndDrawing()
+	}
+
+	// De-Initialization
+	rl.CloseWindow() // Close window and OpenGL context
+}
+
+func calculateMinSegments(startAngle, endAngle float32) float32 {
+	return float32(math.Trunc(math.Ceil((float64(endAngle - startAngle)) / 90)))
+}