drawing - w3toppers.com

iPhone smooth sketch drawing algorithm

CGPoint midPoint(CGPoint p1, CGPoint p2) { return CGPointMake((p1.x + p2.x) * 0.5, (p1.y + p2.y) * 0.5); } -(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { UITouch *touch = [touches anyObject]; previousPoint1 = [touch previousLocationInView:self]; previousPoint2 = [touch previousLocationInView:self]; currentPoint = [touch locationInView:self]; } -(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { UITouch *touch = [touches anyObject]; previousPoint2 = previousPoint1; previousPoint1 … Read more

c# write text on bitmap

Bitmap bmp = new Bitmap(“filename.bmp”); RectangleF rectf = new RectangleF(70, 90, 90, 50); Graphics g = Graphics.FromImage(bmp); g.SmoothingMode = SmoothingMode.AntiAlias; g.InterpolationMode = InterpolationMode.HighQualityBicubic; g.PixelOffsetMode = PixelOffsetMode.HighQuality; g.DrawString(“yourText”, new Font(“Tahoma”,8), Brushes.Black, rectf); g.Flush(); image.Image=bmp;

How to generate an image from text on fly at runtime

Ok, assuming you want to draw a string on an image in C#, you are going to need to use the System.Drawing namespace here: private Image DrawText(String text, Font font, Color textColor, Color backColor) { //first, create a dummy bitmap just to get a graphics object Image img = new Bitmap(1, 1); Graphics drawing = … Read more

Draw a circle with a radius and points around the edge

Points on a circle may be specified as a function of the angle θ: x = a + r cos(θ) y = b + r sin(θ) Here, increments of 2π/8 are shown. Addendum: As suggested in a comment by @Christoffer Hammarström, this revised example reduces the number of magic numbers in the original. The desired … Read more

How To: Best way to draw table in console app (C#)

Use String.Format with alignment values. For example: String.Format(“|{0,5}|{1,5}|{2,5}|{3,5}|”, arg0, arg1, arg2, arg3); To create one formatted row.

Circle drawing with SVG’s arc path

I know it’s a bit late in the game, but I remembered this question from when it was new and I had a similar dillemma, and I accidently found the “right” solution, if anyone is still looking for one: <path d=” M cx cy m -r, 0 a r,r 0 1,0 (r * 2),0 a … Read more

C# – Faster Alternatives to SetPixel and GetPixel for Bitmaps for Windows Forms App

The immediately usable code public class DirectBitmap : IDisposable { public Bitmap Bitmap { get; private set; } public Int32[] Bits { get; private set; } public bool Disposed { get; private set; } public int Height { get; private set; } public int Width { get; private set; } protected GCHandle BitsHandle { get; … Read more

Draw in Canvas by finger, Android

Start By going through the Fingerpaint demo in the sdk sample. Another Sample: public class MainActivity extends Activity { DrawingView dv ; private Paint mPaint; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); dv = new DrawingView(this); setContentView(dv); mPaint = new Paint(); mPaint.setAntiAlias(true); mPaint.setDither(true); mPaint.setColor(Color.GREEN); mPaint.setStyle(Paint.Style.STROKE); mPaint.setStrokeJoin(Paint.Join.ROUND); mPaint.setStrokeCap(Paint.Cap.ROUND); mPaint.setStrokeWidth(12); } public class DrawingView extends View { … Read more

Draw line on canvas and modify the position after it’s been drawn

Please try this.In this you can draw and edit the line. class Drawing extends View{ private Canvas mCanvas = null; private Path mPath = null; private Paint mBitmapPaint = null; private Bitmap mBitmap = null; private Bitmap bit=null; private Paint mPaint = null; private MainActivity baseMainActivity = null; public interface onDrawingViewSingleTap{ void onDrawingViewTap(float x , … Read more