Initial commit

examples/text/ttf_loading/main.go

@@ -0,0 +1,112 @@
+package main
+
+import (
+	"fmt"
+
+	"github.com/gen2brain/raylib-go/raylib"
+)
+
+func main() {
+	screenWidth := int32(800)
+	screenHeight := int32(450)
+
+	raylib.InitWindow(screenWidth, screenHeight, "raylib [text] example - ttf loading")
+
+	msg := "TTF SpriteFont"
+
+	// NOTE: Textures/Fonts MUST be loaded after Window initialization (OpenGL context is required)
+
+	fontChars := int32(0)
+
+	// TTF SpriteFont loading with custom generation parameters
+	font := raylib.LoadSpriteFontTTF("fonts/KAISG.ttf", 96, 0, &fontChars)
+
+	// Generate mipmap levels to use trilinear filtering
+	// NOTE: On 2D drawing it won't be noticeable, it looks like FILTER_BILINEAR
+	raylib.GenTextureMipmaps(&font.Texture)
+
+	fontSize := font.Size
+	fontPosition := raylib.NewVector2(40, float32(screenHeight)/2+50)
+	textSize := raylib.Vector2{}
+
+	raylib.SetTextureFilter(font.Texture, raylib.FilterPoint)
+	currentFontFilter := 0 // FilterPoint
+
+	count := int32(0)
+	droppedFiles := make([]string, 0)
+
+	raylib.SetTargetFPS(60)
+
+	for !raylib.WindowShouldClose() {
+		// Update
+		//----------------------------------------------------------------------------------
+		fontSize += raylib.GetMouseWheelMove() * 4.0
+
+		// Choose font texture filter method
+		if raylib.IsKeyPressed(raylib.KeyOne) {
+			raylib.SetTextureFilter(font.Texture, raylib.FilterPoint)
+			currentFontFilter = 0
+		} else if raylib.IsKeyPressed(raylib.KeyTwo) {
+			raylib.SetTextureFilter(font.Texture, raylib.FilterBilinear)
+			currentFontFilter = 1
+		} else if raylib.IsKeyPressed(raylib.KeyThree) {
+			// NOTE: Trilinear filter won't be noticed on 2D drawing
+			raylib.SetTextureFilter(font.Texture, raylib.FilterTrilinear)
+			currentFontFilter = 2
+		}
+
+		textSize = raylib.MeasureTextEx(font, msg, float32(fontSize), 0)
+
+		if raylib.IsKeyDown(raylib.KeyLeft) {
+			fontPosition.X -= 10
+		} else if raylib.IsKeyDown(raylib.KeyRight) {
+			fontPosition.X += 10
+		}
+
+		// Load a dropped TTF file dynamically (at current fontSize)
+		if raylib.IsFileDropped() {
+			droppedFiles = raylib.GetDroppedFiles(&count)
+
+			if count == 1 { // Only support one ttf file dropped
+				raylib.UnloadSpriteFont(font)
+				font = raylib.LoadSpriteFontTTF(droppedFiles[0], fontSize, 0, &fontChars)
+				raylib.ClearDroppedFiles()
+			}
+		}
+
+		raylib.BeginDrawing()
+
+		raylib.ClearBackground(raylib.RayWhite)
+
+		raylib.DrawText("Use mouse wheel to change font size", 20, 20, 10, raylib.Gray)
+		raylib.DrawText("Use KEY_RIGHT and KEY_LEFT to move text", 20, 40, 10, raylib.Gray)
+		raylib.DrawText("Use 1, 2, 3 to change texture filter", 20, 60, 10, raylib.Gray)
+		raylib.DrawText("Drop a new TTF font for dynamic loading", 20, 80, 10, raylib.DarkGray)
+
+		raylib.DrawTextEx(font, msg, fontPosition, float32(fontSize), 0, raylib.Black)
+
+		// TODO: It seems texSize measurement is not accurate due to chars offsets...
+		//raylib.DrawRectangleLines(int32(fontPosition.X), int32(fontPosition.Y), int32(textSize.X), int32(textSize.Y), raylib.Red)
+
+		raylib.DrawRectangle(0, screenHeight-80, screenWidth, 80, raylib.LightGray)
+		raylib.DrawText(fmt.Sprintf("Font size: %02.02f", float32(fontSize)), 20, screenHeight-50, 10, raylib.DarkGray)
+		raylib.DrawText(fmt.Sprintf("Text size: [%02.02f, %02.02f]", textSize.X, textSize.Y), 20, screenHeight-30, 10, raylib.DarkGray)
+		raylib.DrawText("CURRENT TEXTURE FILTER:", 250, 400, 20, raylib.Gray)
+
+		if currentFontFilter == 0 {
+			raylib.DrawText("POINT", 570, 400, 20, raylib.Black)
+		} else if currentFontFilter == 1 {
+			raylib.DrawText("BILINEAR", 570, 400, 20, raylib.Black)
+		} else if currentFontFilter == 2 {
+			raylib.DrawText("TRILINEAR", 570, 400, 20, raylib.Black)
+		}
+
+		raylib.EndDrawing()
+	}
+
+	raylib.UnloadSpriteFont(font) // SpriteFont unloading
+
+	raylib.ClearDroppedFiles() // Clear internal buffers
+
+	raylib.CloseWindow()
+}