added a SetBounds function to replace the SetSize function

canvas.go

@@ -96,12 +96,8 @@ const (
 // the origin, since GL uses the bottom left coordinate, the
 // coordinates given here also use the bottom left as origin
 func New(x, y, w, h int) *Canvas {
-	cv := &Canvas{
-		x: x, y: y, w: w, h: h,
-		fx: float64(x), fy: float64(y),
-		fw: float64(w), fh: float64(h),
-		stateStack: make([]drawState, 0, 20),
-	}
+	cv := &Canvas{stateStack: make([]drawState, 0, 20)}
+	cv.SetBounds(x, y, w, h)
 	cv.state.lineWidth = 1
 	cv.state.globalAlpha = 1
 	cv.state.fill.color = glColor{a: 1}
@@ -112,12 +108,24 @@ func New(x, y, w, h int) *Canvas {
 
 // SetSize changes the internal size of the canvas. This would
 // usually be called for example when the window is resized
+//
+// Deprecated: Use SetBounds instead
 func (cv *Canvas) SetSize(w, h int) {
 	cv.w, cv.h = w, h
 	cv.fw, cv.fh = float64(w), float64(h)
 	activeCanvas = nil
 }
 
+// SetBounds updates the bounds of the canvas. This would
+// usually be called for example when the window is resized
+func (cv *Canvas) SetBounds(x, y, w, h int) {
+	cv.x, cv.y = x, y
+	cv.w, cv.h = w, h
+	cv.fx, cv.fy = float64(x), float64(y)
+	cv.fw, cv.fh = float64(w), float64(h)
+	activeCanvas = nil
+}
+
 // Width returns the internal width of the canvas
 func (cv *Canvas) Width() int { return cv.w }
 

examples/android/android.go

@@ -24,8 +24,7 @@ func OnSurfaceChanged(w, h int) {
 		time.Sleep(100 * time.Millisecond)
 		panic(err)
 	}
-	cv = canvas.New(0, 0, 0, 0)
-	cv.SetSize(w, h)
+	cv = canvas.New(0, 0, w, h)
 }
 
 func OnDrawFrame() {

examples/drawing/drawing.go

@@ -28,7 +28,7 @@ func main() {
 	rg.AddColorStop(0.5, "#0000ff")
 
 	wnd.SizeChange = func(w, h int) {
-		cv.SetSize(w, h)
+		cv.SetBounds(0, 0, w, h)
 	}
 
 	wnd.MainLoop(func() {

examples/events/events.go

@@ -44,7 +44,7 @@ func main() {
 		}
 	}
 	wnd.SizeChange = func(w, h int) {
-		cv.SetSize(w, h)
+		cv.SetBounds(0, 0, w, h)
 	}
 
 	lastTime := time.Now()

examples/glfw/glfw.go

@@ -60,7 +60,7 @@ func main() {
 
 		// set canvas size
 		ww, wh := window.GetSize()
-		cv.SetSize(ww, wh)
+		cv.SetBounds(0, 0, ww, wh)
 
 		// call the run function to do all the drawing
 		run(cv, float64(ww), float64(wh))

examples/sdl/sdl.go

@@ -101,7 +101,7 @@ func main() {
 
 		// set canvas size
 		ww, wh := window.GetSize()
-		cv.SetSize(int(ww), int(wh))
+		cv.SetBounds(0, 0, int(ww), int(wh))
 
 		// call the run function to do all the drawing
 		run(cv, float64(ww), float64(wh))