2d drawing software

One of HTML5 's most welcome new features is the canvas element, which is responsible for setting an area in the page and then using JavaScript to make a dynamic drawing. Basic usage 　　　id= "Drawing" widht= "Max" height= " > a drawing of Somethind Canvas >After setting the canvas, go to the drawing con

1 Preface When using quartz 2D drawing, we usually use the subclass of uiview. Think about the drawrect of this class: add the quartz function call to the method. This method is called every time you need to repaint the view.2. Details In quartz 2D, like other core graphics, plotting is performed in the graphic context. Generally, it is called only the context. W

1 PrefaceWhen using Quartz 2D drawing, we usually use the subclass of UIView. Think about the drawRect of this class: add the Quartz function call to the method. This method is called every time you need to repaint the view. 2. DetailsIn Quartz 2D, like other Core Graphics, plotting is performed in the graphic context. Generally, it is called only the context. Wh

the graphics are redrawn each time the control is displayed. Obviously this performance is very bad, sometimes need to draw pictures in memory, so that can be exported to the phone local, can also be uploaded on the network. Unlike drawing directly on UIView, when drawing in memory, developers need to prepare their own drawing environment, and Quartz

}]; This is a very lightweight way to draw text, and you don't need to create a Uilabel control, and you can tailor the effect to your needs. Drawing pictures 1. Use the method provided by Uikit to draw UIImage *image = [UIImage imagenamed:@ "mp3.jpg"]; Picture Extrude appears in the specified rectangular area [Image drawinrect:cgrectmake (0, 0, 320, 200)]; The picture tile appears in the specified area [Image drawaspatterninrect

For example, to draw a rect, the general method is Vertexbuffer-> lock (); Fillrectvertex (); Vertexbuffer-> unlock (); Settexture (); Drawprimitive (); The validity rate of drawing multiple 2D elements is very low. The reason is that lock/unlock is called multiple times. Improvement Method: 2d element Rendering Use a unified memory buffer and Command record.

iOS Quartz 2d drawing, drawing sometimes requires a graphical transformation.Remember: Quartz 2D Transformation is the beginning of the CG, do not mix with the core animation, Core Animatin is the beginning of the CA.iOS provides a set of API interfaces that can be used for image transformations, and general image tran

The usual Android application development in the picture, look for art design some pictures, put in the project on it, but in addition to using existing images, we can also use 2D drawing, is to draw some patterns or text in view. The classes that are commonly used are canvas (canvas), Paint (brush) and color (used to set brush colors) classes, and of course, many other classes, depending on the needs of yo

Trim area In OpenGL when you create a Windows to draw in the we must specify the coordinate system we want to use and how to map the spec Ified coordinates into physical screen coordinates. We are using the 2D Cartesian coordinate system with the Origin 0,0 at the centre of the would. Before we can start plotting points, lines and shapes in a window we must also specify you to translate coordinate I nto screen coordinates, by specifying the clipping

currenttouchlocation = [thetouch locationinview: Self]; // Obtain the last location Cgpoint lasttouchlocation = [thetouch previuslocationinview: Self]; // Obtain the context Cgcontextref layercontext = cglayergetcontext (whiteboardlayer ); // Start to define path Cgcontextbeginpath (layercontext ); // Move the start point of path to the previous position Cgcontextmovetopoint (layercontext, lasttouchlocation. X, lasttouchlocation. y ); // Link between the last position and the current position,

following code allows the viewport and window to maintain the same aspect ratio to prevent distortion 2 int side = qmin (width (), height ()); 3 int x = (width ()-side/2); 4 int y = (height ()-side/2); 5 Painter.setviewport (x,y,side,side);Transformations of four common coordinate systems: Pan Qtransform Translate (qreal dx, qreal dy) Rotary Qtransform Rotate (qreal angle, qt::axis Axis = Qt::zaxis) Scaling Qtransform scale (qreal SX, Qreal Sy) Twisted Qtransform Shear

WPF learning 05: 2D drawing controls Deformation Using Transform, wpftransform In WPF learning 04: 2D drawing using Shape to draw basic graphics, we learned how to draw basic graphics. This time, we further study how to deform the image.Example A triangle formed by Transform: C # code: for (int i = 0; i Shape Introd