init

.gitignore

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+showimage

Makefile

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+b:
+	odin build showimage.odin -file

showimage.odin

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+package showimage
+
+import "core:os"
+import s "core:strings"
+import rl "vendor:raylib"
+
+path: string
+tex: ^rl.Texture
+zoom: f32 = 1
+offset: [2]f32
+
+main :: proc() {
+	config: rl.ConfigFlags = { .WINDOW_RESIZABLE }
+	rl.InitWindow(800, 600, "showimage")
+	rl.SetWindowState(config)
+
+	if len(os.args) > 1 {
+		path = os.args[1]
+		t := rl.LoadTexture(s.clone_to_cstring(path))
+		tex = &t
+		reset_zoom()
+	}
+
+	for !rl.WindowShouldClose() {
+		scroll := rl.GetMouseWheelMove()
+		if scroll > 0 {
+			zoom *= 2
+		} else if scroll < 0 {
+			zoom /= 2
+		}
+		if rl.IsMouseButtonDown(rl.MouseButton.LEFT) {
+			offset += rl.GetMouseDelta()
+		}
+		if rl.IsMouseButtonPressed(rl.MouseButton.RIGHT) {
+			offset = 0
+			reset_zoom()
+		}
+		rl.BeginDrawing()
+			rl.ClearBackground({50, 50, 50, 255})
+			if tex != nil {
+				rl.DrawTextureEx(tex^, offset, 0, zoom, rl.WHITE)
+			}
+		rl.EndDrawing()
+	}
+	rl.CloseWindow()
+}
+
+reset_zoom :: proc() {
+	screen_width := rl.GetRenderWidth()
+	fit_x: i32 = 1
+	for fit_x * tex.width < screen_width {
+		fit_x *= 2
+	}
+	fit_x /= 2
+
+	screen_height := rl.GetRenderHeight()
+	fit_y: i32 = 1
+	for fit_y * tex.height < screen_height {
+		fit_y *= 2
+	}
+	fit_y /= 2
+
+	zoom = f32(min(fit_x, fit_y))
+}