add more examples

examples/textures/mouse_painting/main.go

@@ -0,0 +1,188 @@
+package main
+
+import (
+	rl "github.com/gen2brain/raylib-go/raylib"
+)
+
+var (
+	screenW = int32(800)
+	screenH = int32(450)
+
+	colors = []rl.Color{rl.RayWhite, rl.Yellow, rl.Gold, rl.Pink, rl.Red, rl.Maroon, rl.Green, rl.Lime, rl.DarkGreen, rl.SkyBlue, rl.Blue, rl.DarkBlue, rl.Purple, rl.Violet, rl.DarkPurple, rl.Beige, rl.Brown, rl.DarkBrown, rl.LightGray, rl.Gray, rl.DarkGray, rl.Black}
+
+	colorRecs []rl.Rectangle
+)
+
+func main() {
+
+	rl.InitWindow(screenW, screenH, "raylib [textures] example - mouse painting")
+
+	for i := 0; i < len(colors); i++ {
+		colorRecs = append(colorRecs, rl.NewRectangle(10+(30*float32(i))+(2*float32(i)), 10, 30, 30))
+	}
+	colorSelected, colorMouseHover := 1, 0
+	colorPrev := colorSelected
+	brushSize := float32(20)
+	mousePressed := false
+
+	btnSaveRec := rl.NewRectangle(750, 10, 40, 30)
+	btnSaveMouseHover, showSaveMsg := false, false
+	saveMsgCount := 0
+
+	target := rl.LoadRenderTexture(screenW, screenH)
+
+	rl.BeginTextureMode(target)
+	rl.ClearBackground(colors[0])
+	rl.EndTextureMode()
+
+	rl.SetTargetFPS(60)
+
+	for !rl.WindowShouldClose() {
+
+		mousePos := rl.GetMousePosition()
+
+		if rl.IsKeyPressed(rl.KeyRight) {
+			colorSelected++
+		} else if rl.IsKeyPressed(rl.KeyLeft) {
+			colorSelected--
+		}
+
+		if colorSelected >= len(colors) {
+			colorSelected = len(colors) - 1
+		} else if colorSelected < 0 {
+			colorSelected = 0
+		}
+
+		for i := 0; i < len(colorRecs); i++ {
+			if rl.CheckCollisionPointRec(mousePos, colorRecs[i]) {
+				colorMouseHover = i
+			} else {
+				colorMouseHover = -1
+			}
+
+			if colorMouseHover >= 0 && rl.IsMouseButtonPressed(rl.MouseButtonLeft) {
+				colorSelected = colorMouseHover
+				colorPrev = colorSelected
+			}
+		}
+
+		if rl.IsKeyPressed(rl.KeyUp) {
+			brushSize += 5
+		} else if rl.IsKeyPressed(rl.KeyDown) {
+			brushSize -= 5
+		}
+		brushSize += rl.GetMouseWheelMove() * 5
+		if brushSize < 2 {
+			brushSize = 2
+		}
+		if brushSize > 50 {
+			brushSize = 50
+		}
+
+		if rl.IsKeyPressed(rl.KeyC) {
+			rl.BeginTextureMode(target)
+			rl.ClearBackground(colors[0])
+			rl.EndTextureMode()
+		}
+
+		if rl.IsMouseButtonDown(rl.MouseButtonLeft) {
+			rl.BeginTextureMode(target)
+			if mousePos.Y > 50 {
+				rl.DrawCircle(int32(mousePos.X), int32(mousePos.Y), brushSize, colors[colorSelected])
+			}
+			rl.EndTextureMode()
+		}
+
+		if rl.IsMouseButtonDown(rl.MouseButtonRight) {
+			if !mousePressed {
+				colorPrev = colorSelected
+				colorSelected = 0
+			}
+
+			mousePressed = true
+
+			rl.BeginTextureMode(target)
+			if mousePos.Y > 50 {
+				rl.DrawCircle(int32(mousePos.X), int32(mousePos.Y), brushSize, colors[0])
+			}
+			rl.EndTextureMode()
+		} else if rl.IsMouseButtonReleased(rl.MouseButtonRight) && mousePressed {
+			colorSelected = colorPrev
+			mousePressed = false
+		}
+
+		if rl.CheckCollisionPointRec(mousePos, btnSaveRec) {
+			btnSaveMouseHover = true
+		} else {
+			btnSaveMouseHover = false
+		}
+
+		if btnSaveMouseHover && rl.IsMouseButtonReleased(rl.MouseButtonLeft) || rl.IsKeyPressed(rl.KeyS) {
+			image := rl.LoadImageFromTexture(target.Texture)
+			rl.ImageFlipVertical(image)
+			rl.ExportImage(*image, "raylib_mouse_painting.png")
+			rl.UnloadImage(image)
+			showSaveMsg = true
+		}
+
+		if showSaveMsg {
+			saveMsgCount++
+			if saveMsgCount > 240 {
+				showSaveMsg = false
+				saveMsgCount = 0
+			}
+		}
+
+		rl.BeginDrawing()
+		rl.ClearBackground(rl.RayWhite)
+
+		rl.DrawTextureRec(target.Texture, rl.NewRectangle(0, 0, float32(target.Texture.Width), -float32(target.Texture.Height)), rl.Vector2Zero(), rl.White)
+
+		if mousePos.Y > 50 {
+			if rl.IsMouseButtonDown(rl.MouseButtonRight) {
+				rl.DrawCircleLines(int32(mousePos.X), int32(mousePos.Y), brushSize, rl.Gray)
+			} else {
+				rl.DrawCircle(rl.GetMouseX(), rl.GetMouseY(), brushSize, colors[colorSelected])
+			}
+		}
+
+		rl.DrawRectangle(0, 0, int32(rl.GetScreenWidth()), 50, rl.RayWhite)
+		rl.DrawLine(0, 50, int32(rl.GetScreenWidth()), 50, rl.LightGray)
+
+		for i := 0; i < len(colors); i++ {
+			rl.DrawRectangleRec(colorRecs[i], colors[i])
+		}
+
+		rl.DrawRectangleLines(10, 10, 30, 30, rl.LightGray)
+
+		if colorMouseHover >= 0 {
+			rl.DrawRectangleRec(colorRecs[colorMouseHover], rl.Fade(rl.White, 0.6))
+		}
+
+		rl.DrawRectangleLinesEx(rl.NewRectangle(colorRecs[colorSelected].X-2, colorRecs[colorSelected].Y-2, colorRecs[colorSelected].Width+4, colorRecs[colorSelected].Height+4), 2, rl.Black)
+
+		if btnSaveMouseHover {
+			rl.DrawRectangleLinesEx(btnSaveRec, 2, rl.Red)
+			rl.DrawText("SAVE!", 755, 20, 10, rl.Red)
+		} else {
+			rl.DrawRectangleLinesEx(btnSaveRec, 2, rl.Black)
+			rl.DrawText("SAVE!", 755, 20, 10, rl.Black)
+		}
+
+		if showSaveMsg {
+			rl.DrawRectangle(0, 0, int32(rl.GetScreenWidth()), int32(rl.GetScreenHeight()), rl.Fade(rl.RayWhite, 0.8))
+			rl.DrawRectangle(0, screenH/2-40, int32(rl.GetScreenWidth()), 80, rl.Black)
+			txt := "IMG SAVED"
+			txtlen := rl.MeasureText(txt, 20)
+			rl.DrawText(txt, screenW/2-txtlen/2, screenH/2-10, 20, rl.RayWhite)
+		}
+
+		rl.DrawText("hold left mouse to draw right mouse to erase | mouse wheel up/down arrows change brush size  |  right/left arrows change color | c key to clear", 10, screenH-15, 10, rl.Black)
+
+		rl.EndDrawing()
+	}
+
+	rl.UnloadRenderTexture(target)
+
+	rl.CloseWindow()
+}