trigonometry in python

Back to "flash Basic Theory Class-Catalog" Starting with this chapter, we will learn trigonometry and apply it to the animation technology in the fifth chapter, actually in the next chapter of the drawing technology will be contacted. If you already have a knowledge of trigonometry or are eager to learn about animation, you can skip the start section and then come back to learn when you don't know what to

, canvas.height); A the varDX = mouse.x-arrow.x, +DY = mouse.y-Arrow.y, -Rotate =math.atan2 (dy, dx); $ $Arrow.rotate =rotate; - - Arrow.draw (context); the})();View CodeExample 2, Smoothing motion:Key codeYPos = centery + math.sin (angle) *+ = 0.1;Example 3, Pulse motion:Note that you do not need to clear the canvas here, and you should use Beginpath () when you start drawingExample 4, circular motion:The main point of the circular motion is to use sine to calculate the x-coordinate, cos

integer number to a hexadecimal-represented string.int: Represents a decimal integer that needs to be converted.Example:Tohex (15) equals "F".Tohex (20) equals "14".TooctalTooctal (int): Converts a decimal integer to a string in octal notation.int: Represents a decimal integer that needs to be converted.Example:Tooctal (10) equals "12".Tooctal (20) equals "24".TRUNCTRUNC (number,num_digits): Rounding. The fractional part of the number is truncated to return an integer.Number: You need to trunca

/MATH.PI;}private void Handle_mousemove (object sender, MouseEventArgs e){MousePosition = E.getposition (null);if (ismousecaptured){Lastangle = Math.atan2 (Lastposition.y-canvascenter.y, lastposition.x-canvascenter.x);Currentangle = Math.atan2 (Mouseposition.y-canvascenter.y, mouseposition.x-canvascenter.x);Angledelta = Currentangle-lastangle;Rotateitemcanvas.angle + = Radianstodegrees (Angledelta);Lastposition = mouseposition;}}rotatable UserControl complete codeIt is also very simple to use, d

Collection--Initialize 250 snowflake objects and animate with colleaguesFlake = new listSnowflake Coordinate CollectionXystart = new listOpacity CollectionOpacityvalue = new listfor (int i = 0; i {Different starting and ending coordinatesPoint newpoint = new Point (Rand.next ((int) layoutroot.width), Rand.next ((int) layoutroot.height));Xystart.add (Newpoint);Different transparency valuesOpacityvalue.add (Rand.nextdouble ());}Initflakes ();snowfall.completed + = new EventHandler (snowfall_compl

Back to "flash Basic Theory Class-Catalog" Linear vertical Motion In the wave1.as file, a linear vertical motion is added, just to add some inspiration to our animation. The following is the code for this file: package { 　import

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Python learning notes-python program running, python-python I am a beginner in python and write down some of my ideas. Please ignore it. Install the python editor and configure the environment (see install and configure

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