Merge pull request #442 from Hultan/draw_ring

New example: Shapes/Draw_ring

examples/shapes/draw_ring/main.go

@@ -0,0 +1,121 @@
+/*******************************************************************************************
+*
+*   raylib [shapes] example - draw ring (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 ring")
+
+	center := rl.Vector2{X: (float32(rl.GetScreenWidth()) - 300) / 2.0, Y: float32(rl.GetScreenHeight()) / 2.0}
+
+	var innerRadius, outerRadius float32 = 80.0, 190.0
+	var startAngle, endAngle float32 = 0.0, 360
+	var segments float32 = 0.0
+
+	drawRing, drawRingLines, drawSectorLines := true, false, false
+
+	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
+		// Update
+		// NOTE: All variables update happens inside GUI control functions
+
+		// Draw
+		rl.BeginDrawing()
+
+		rl.ClearBackground(rl.RayWhite)
+
+		rl.DrawLine(500, 0, 500, int32(rl.GetScreenHeight()), rl.Fade(rl.LightGray, 0.6))
+		rl.DrawRectangle(500, 0, int32(rl.GetScreenWidth())-500, int32(rl.GetScreenHeight()),
+			rl.Fade(rl.LightGray, 0.3))
+
+		if drawRing {
+			rl.DrawRing(center, innerRadius, outerRadius, startAngle, endAngle, int32(
+				segments), rl.Fade(rl.Maroon, 0.3))
+		}
+		if drawRingLines {
+			rl.DrawRingLines(center, innerRadius, outerRadius, startAngle, endAngle, int32(
+				segments), rl.Fade(rl.Black, 0.4))
+		}
+		if drawSectorLines {
+			rl.DrawCircleSectorLines(center, outerRadius, startAngle, endAngle, int32(
+				segments), rl.Fade(rl.Black, 0.4))
+		}
+
+		// Draw GUI controls
+		//------------------------------------------------------------------------------
+		startAngle = gui.Slider(rl.Rectangle{
+			X: 600, Y: 40, Width: 120, Height: 20,
+		}, "StartAngle", fmt.Sprintf("%.2f", startAngle), startAngle, -450, 450)
+		endAngle = gui.Slider(rl.Rectangle{
+			X: 600, Y: 70, Width: 120, Height: 20,
+		}, "EndAngle", fmt.Sprintf("%.2f", endAngle), endAngle, -450, 450)
+
+		innerRadius = gui.Slider(rl.Rectangle{
+			X: 600, Y: 140, Width: 120, Height: 20,
+		}, "InnerRadius", fmt.Sprintf("%.2f", innerRadius), innerRadius, 0, 100)
+		outerRadius = gui.Slider(rl.Rectangle{
+			X: 600, Y: 170, Width: 120, Height: 20,
+		}, "OuterRadius", fmt.Sprintf("%.2f", outerRadius), outerRadius, 0, 200)
+
+		segments = gui.Slider(rl.Rectangle{
+			X: 600, Y: 240, Width: 120, Height: 20,
+		}, "Segments", fmt.Sprintf("%.2f", segments), segments, 0, 100)
+
+		drawRing = gui.CheckBox(rl.Rectangle{
+			X: 600, Y: 320, Width: 20, Height: 20,
+		}, "Draw Ring", drawRing)
+		drawRingLines = gui.CheckBox(rl.Rectangle{
+			X: 600, Y: 350, Width: 20, Height: 20,
+		}, "Draw Ring Lines", drawRingLines)
+		drawSectorLines = gui.CheckBox(rl.Rectangle{
+			X: 600, Y: 380, Width: 20, Height: 20,
+		}, "Draw Sector Lines", drawSectorLines)
+
+		minSegments := ceil((endAngle - startAngle) / 90)
+		var color = rl.DarkGray
+		if segments >= minSegments {
+			color = rl.Maroon
+		}
+		var mode = "AUTO"
+		if segments >= minSegments {
+			mode = "MANUAL"
+		}
+		rl.DrawText(fmt.Sprintf("MODE: %s", mode), 600, 270, 10, color)
+		rl.DrawFPS(10, 10)
+
+		rl.EndDrawing()
+	}
+
+	// De-Initialization
+	rl.CloseWindow() // Close window and OpenGL context
+}
+
+func ceil(value float32) float32 {
+	return float32(math.Ceil(float64(value)))
+}