New example : Textures/npatch_drawing

examples/textures/npatch_drawing/main.go

@@ -0,0 +1,134 @@
+/*******************************************************************************************
+*
+*   raylib [textures] example - N-patch drawing
+*
+*   NOTE: Images are loaded in CPU memory (RAM); textures are loaded in GPU memory (VRAM)
+*
+*   Example originally created with raylib 2.0, last time updated with raylib 2.5
+*
+*   Example contributed by Jorge A. Gomes (@overdev) 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 Jorge A. Gomes (@overdev) and Ramon Santamaria (@raysan5)
+*
+********************************************************************************************/
+package main
+
+import rl "github.com/gen2brain/raylib-go/raylib"
+
+const (
+	screenWidth  = 800
+	screenHeight = 450
+)
+
+func main() {
+	rl.InitWindow(screenWidth, screenHeight, "raylib [textures] example - N-patch drawing")
+
+	// NOTE: Textures MUST be loaded after Window initialization (OpenGL context is required)
+	nPatchTexture := rl.LoadTexture("ninepatch_button.png")
+
+	var mousePosition rl.Vector2
+	var origin rl.Vector2
+
+	// Position and size of the n-patches
+	dstRec1 := rl.Rectangle{X: 480.0, Y: 160.0, Width: 32.0, Height: 32.0}
+	dstRec2 := rl.Rectangle{X: 160.0, Y: 160.0, Width: 32.0, Height: 32.0}
+	dstRecH := rl.Rectangle{X: 160.0, Y: 93.0, Width: 32.0, Height: 32.0}
+	dstRecV := rl.Rectangle{X: 92.0, Y: 160.0, Width: 32.0, Height: 32.0}
+
+	// A 9-patch (NPatchNinePatch) changes its sizes in both axis
+	ninePatchInfo1 := rl.NPatchInfo{
+		Source: rl.Rectangle{Width: 64.0, Height: 64.0},
+		Left:   12,
+		Top:    40,
+		Right:  12,
+		Bottom: 12,
+		Layout: rl.NPatchNinePatch,
+	}
+	ninePatchInfo2 := rl.NPatchInfo{
+		Source: rl.Rectangle{Y: 128.0, Width: 64.0, Height: 64.0},
+		Left:   16,
+		Top:    16,
+		Right:  16,
+		Bottom: 16,
+		Layout: rl.NPatchNinePatch,
+	}
+
+	// A horizontal 3-patch (NPatchThreePatchHorizontal) changes its sizes along the x-axis only
+	h3PatchInfo := rl.NPatchInfo{
+		Source: rl.Rectangle{Y: 64.0, Width: 64.0, Height: 64.0},
+		Left:   8,
+		Top:    8,
+		Right:  8,
+		Bottom: 8,
+		Layout: rl.NPatchThreePatchHorizontal,
+	}
+
+	// A vertical 3-patch (NPatchThreePatchVertical) changes its sizes along the y-axis only
+	v3PatchInfo := rl.NPatchInfo{
+		Source: rl.Rectangle{Y: 192.0, Width: 64.0, Height: 64.0},
+		Left:   6,
+		Top:    6,
+		Right:  6,
+		Bottom: 6,
+		Layout: rl.NPatchThreePatchVertical,
+	}
+
+	rl.SetTargetFPS(60)
+
+	// Main game loop
+	for !rl.WindowShouldClose() { // Detect window close button or ESC key
+		mousePosition = rl.GetMousePosition()
+
+		// Resize the n-patches based on mouse position
+		dstRec1.Width = mousePosition.X - dstRec1.X
+		dstRec1.Height = mousePosition.Y - dstRec1.Y
+		dstRec2.Width = mousePosition.X - dstRec2.X
+		dstRec2.Height = mousePosition.Y - dstRec2.Y
+		dstRecH.Width = mousePosition.X - dstRecH.X
+		dstRecV.Height = mousePosition.Y - dstRecV.Y
+
+		// Set a minimum Width and/or Height
+		dstRec1.Width = clamp(dstRec1.Width, 1, 300)
+		dstRec1.Height = clamp(dstRec1.Height, 1, screenHeight)
+		dstRec2.Width = clamp(dstRec2.Width, 1, 300)
+		dstRec2.Height = clamp(dstRec2.Height, 1, screenHeight)
+		dstRecH.Width = clamp(dstRecH.Width, 1, screenWidth)
+		dstRecV.Height = clamp(dstRecV.Height, 1, screenHeight)
+
+		// Draw
+		rl.BeginDrawing()
+		rl.ClearBackground(rl.RayWhite)
+
+		// Draw the n-patches
+		rl.DrawTextureNPatch(nPatchTexture, ninePatchInfo2, dstRec2, origin, 0.0, rl.White)
+		rl.DrawTextureNPatch(nPatchTexture, ninePatchInfo1, dstRec1, origin, 0.0, rl.White)
+		rl.DrawTextureNPatch(nPatchTexture, h3PatchInfo, dstRecH, origin, 0.0, rl.White)
+		rl.DrawTextureNPatch(nPatchTexture, v3PatchInfo, dstRecV, origin, 0.0, rl.White)
+
+		// Draw the source texture
+		rl.DrawRectangleLines(5, 88, 74, 266, rl.Blue)
+		rl.DrawTexture(nPatchTexture, 10, 93, rl.White)
+		rl.DrawText("TEXTURE", 15, 360, 10, rl.DarkGray)
+
+		rl.DrawText("Move the mouse to stretch or shrink the n-patches", 10, 20, 20, rl.DarkGray)
+
+		rl.EndDrawing()
+	}
+
+	// De-Initialization
+	rl.UnloadTexture(nPatchTexture) // Texture unloading
+	rl.CloseWindow()                // Close window and OpenGL context
+}
+
+func clamp(value, min, max float32) float32 {
+	if value < min {
+		return min
+	}
+	if value > max {
+		return max
+	}
+	return value
+}