完善 w4-life 游戏交互

waroot/examples/w4-life/src/bitimg.wa

@@ -21,6 +21,9 @@ func BitImage.At(x, y: int) => bool {
 }
 
 func BitImage.Set(x, y: int, c: bool) {
+	if x < 0 || x >= this.Width || y < 0 || y >= this.Height {
+		return
+	}
 	idx := (y*this.Width + x) / 8
 	if c {
 		this.Pix[idx] = byte(setBit(uint(this.Pix[idx]), uint(x%8)))

waroot/examples/w4-life/src/life.wa

@@ -45,6 +45,14 @@ func LifeInit {
 	}
 }
 
+func LifeSetRect(x0, y0, x1, y1: int) {
+	for x := x0; x < x1; x++ {
+		for y := y0; y < y1; y++ {
+			cells0.Set(x, y, true)
+		}
+	}
+}
+
 type DIR :struct {
 	x: int
 	y: int

waroot/examples/w4-life/src/main.wa

@@ -18,5 +18,22 @@ func Update {
 		LifeStart()
 	}
 
+	mouseX := int(wasm4.GetMouseX())
+	mouseY := int(wasm4.GetMouseY())
+
+	if byte(wasm4.GetMouseButtons()) == wasm4.MOUSE_LEFT {
+		LifeSetRect(mouseX-2, mouseY-2, mouseX+2, mouseY+2)
+	}
+
 	LifeStep()
+
+	drawMouse(mouseX, mouseY)
+}
+
+func drawMouse(mouseX, mouseY: int) {
+	if mouseX < 0 || mouseY < 0 || mouseX >= wasm4.SCREEN_SIZE || mouseY >= wasm4.SCREEN_SIZE {
+		return
+	}
+	wasm4.SetDrawColors(2)
+	wasm4.Rect(mouseX-1, mouseY-1, 3, 3)
 }