Added Drawtest

Plugin_DrawTest.as

@@ -0,0 +1,89 @@
+#name "Draw example"
+#author "Miss"
+
+/* This plugin is a simple demo of the drawing API. It draws a circle
+ * and a rounded square on the screen, with a line in between, and the
+ * text "Hello, world!" next to it.
+ *
+ * It moves this continously across the screen.
+ */
+
+// These are just some states we have to remember for our movement.
+uint64 g_fromTime;
+uint64 g_toTime;
+vec2 g_fromPoint;
+vec2 g_toPoint;
+float g_fromCircleRadius;
+float g_toCircleRadius;
+
+int g_interval = 500;
+
+// Easing function.
+float easeQuad(float x)
+{
+	if ((x /= 0.5) < 1) return 0.5 * x * x;
+	return -0.5 * ((--x) * (x - 2) - 1);
+}
+
+// Our Main function, which merely updates our states when needed.
+void Main()
+{
+	// Draw::GetWidth() gets the width of the screen. If this returns -1,
+	// the rendering isn't ready yet and you can't use the Draw API, so
+	// we have to wait for that to be a valid value.
+	while (Draw::GetWidth() == -1) {
+		yield();
+	}
+
+	g_toPoint = vec2(
+		Draw::GetWidth() / 2.0f,
+		Draw::GetHeight() / 2.0f
+	);
+
+	while (true) {
+		g_fromPoint = g_toPoint;
+
+		vec2 newPoint;
+		do {
+			float newAngle = Math::Rand(0.0f, Math::PI * 2.0f);
+			newPoint = g_fromPoint + vec2(Math::Cos(newAngle), Math::Sin(newAngle)) * 300.0f;
+		} while (newPoint.x < 0 || newPoint.y < 0 || newPoint.x > Draw::GetWidth() || newPoint.y > Draw::GetHeight());
+
+		g_toPoint = newPoint;
+		g_fromTime = Time::Now;
+		g_toTime = g_fromTime + g_interval;
+
+		g_fromCircleRadius = g_toCircleRadius;
+		g_toCircleRadius = g_fromCircleRadius + 0.4f;
+
+		// We sleep a bit to wait for the next needed change.
+		sleep(g_interval);
+	}
+}
+
+void Render()
+{
+	float timeFactor = Math::InvLerp(g_fromTime, g_toTime, Time::Now);
+
+	vec4 colFill = vec4(1, 0.9f, 0.7f, 1);
+	vec4 colBorder = vec4(1, 1, 1, 1);
+
+	vec2 point = Math::Lerp(g_fromPoint, g_toPoint, easeQuad(timeFactor));
+	float circleRadius = Math::Lerp(g_fromCircleRadius, g_toCircleRadius, timeFactor);
+	vec2 circlePos = point + vec2(Math::Cos(circleRadius), Math::Sin(circleRadius)) * 75.0f;
+
+	// Draws a line.
+	Draw::DrawLine(point, circlePos, colBorder, 2.0f);
+
+	// Draws a filled rectangle with a border rounding of 8px, followed
+	// by a border of 2px width and 8px border rounding.
+	Draw::FillRect(vec4(point.x - 16, point.y - 16, 32, 32), colFill, 8.0f);
+	Draw::DrawRect(vec4(point.x - 16, point.y - 16, 32, 32), colBorder, 8.0f, 2.0f);
+
+	// Draws a filled circle, followed by a border of 2px width.
+	Draw::FillCircle(circlePos, 16.0f, colFill);
+	Draw::DrawCircle(circlePos, 16.0f, colBorder, 2.0f);
+
+	// Draws the string "Hello, world!" below the square position.
+	Draw::DrawString(point + vec2(0, 24), colBorder, "Hello, world!");
+}