android canvas example

When drawing a dynamic image in the canvas, if a fixed background image is used, only one small genie is moving! In this case, you have to re-draw the background image without frame, reducing the efficiency! I tried various methods and eventually failed! If anyone has a good method, please provide it. Thank you! The following are some examples of the exploration process: 1. An article about redrawing images. However, it can only be applied to th

=New rect (0, 0, Icon.getwidth (), Icon.getheight ()); Rect dst=New rect (0, 0, Iconsize, iconsize); Canvas.drawbitmap (icon, SRC, DST, iconpaint); //enable antialiasing and use device text kerning Paint countpaint=New paint (paint.anti_alias_flag|Paint.dev_kern_text_flag); Countpaint.setcolor (color.red); Countpaint.settextsize (20f); Countpaint.settypeface (Typeface.default_bold); Canvas.drawtext (String.valueof (count), iconsize-, countpaint); return Contacticon;

Implementation and demo of the Android canvas Today we bring you a simple implementation of the Android canvas function. The following is: The following are the key source code: import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.gr

The relationship between Drawable, Bitmap, Canvas, and painting should be known for Android development. First, let's understand that the display class in the Android platform is View, but it also provides the underlying graphics class android. graphics. What we call today is the underlying graphic interface of graphi

()/6);Canvas.concat (m);Canvas.drawbitmap (Mbmp,0,0,null);Super.ondraw (canvas);Canvas.restore ();Represents a matrix change that removes Polytopoly. Just shows the picture display of the clipping area.The source code of the five sequence diagram is:Mbmp=bitmapfactory.decoderesource (Getresources (), R.DRAWABLE.GUIDE_PAGE01);Canvas.save ();float src[]={0,0,getwidth (), 0,getwidth (), GetHeight (), 0,getheight ()};float sou[]={0,0, (float) (getwidth (

bitmapdrawable) {bitmapdrawable BD = (bitmapdrawable) icon; return BD. getbitmap () ;}else {return NULL ;}} After obtaining the icon, you need to process it. You need to overwrite the number of the icon. /*** Add the number in the upper-right corner of the given image * @ Param icon */private bitmap generatorcontactcounticon (Bitmap icon) {// initialize the canvas int iconsize = (INT) getresources (). getdimension (

DryJava.lang.UnsupportedOperationException at Android.view.GLES20Canvas.clipPath (gles20canvas.java:287) at Br.com.iba.view.PageCurlView.drawCurl (pagecurlview.java:284) at Br.com.iba.view.PageCurlView.onDraw ( pagecurlview.java:353) at Android.view.View.draw (view.java:9291)In the canvas of the Clippath method to draw the image, on the NEXUS5 run no problem, but to red rice phone on the No, show no effect, after a change of a Huawei m

@Override Public void Draw (canvas canvas) { if (mdrawable!=null) { int sc= Canvas.save (); if (manimation!=null) { manimation.gettransformation ( Animationutils.currentanimationtimemillis (), mtransformation); Canvas.concat (Mtransformation.getmatrix ());

Recently, I am working on an e-book project to bring together the open-source shelves + ireader page flip and curl. I encountered the following problems when doing the curl effect: Java. Lang. Unsupported operation exception, Android. View. gles20canvas. clippath (gles20canvas... The omnipotent Gu Ge told me that this is a hardware acceleration problem, but I have never enabled hardware acceleration. I did a test and the hardware acceleration at the v

When drawing a dynamic diagram in canvas, if a fixed background image is used, only a small sprite is moving! In this case, you have to redraw the background picture in the frame without frames, making it less efficient! Tried all kinds of methods, and finally failed! If someone has a good method, can provide a bit, thank you! Here are some of the ways to share in the process : 1, an article about the picture redraw, but only applies to the Genie

understand to take a block of things to turn their own view). Then, it rotates clockwise, and then we look at it from the screen of the phone, and we see the change.Let's look at one more example: Camera.rotatey (45)He meant to rotate 45 degrees clockwise around the y-axis. If the middle and y axes of the object coincide, the clockwise rotation around the y-axis is 45 degrees, which means the right half of the object flips inward and the left half is

* treats theSweep angle modulo.If theSweep angle isNegative, * theSweep angle isTreated asSweep angle modulo the isDrawn clockwise. An angle of 0degrees correspond to the* Geometric angle of 0Degrees (3O ' clock onA watch.) ofOval used toDefine theShape andSize * of theARC * @param startangle starting angle (inchDegreeswhere theArc begins * @param sweepAngle Sweep Angle (inchdegrees) measured clockwise * @param usecenter Iftrue, include theCenter of theOvalinch theArc andCloseit if it is

(context context) { super (context); this.context= context; } public ChartView (context Context, AttributeSet attrs) { super (context, attrs); this.context= context; } public ChartView (context context, AttributeSet attrs, int defstyleattr) { super (context, attrs, defstyleattr); this.context= context; } /** returns the maximum value **/ protected Double Getmaxarray (arraylist max:i; } return max; } nbsp; /** Returns the minimum value **/ protected double getminarray (arraylistThe

This example implements a simple columnar chart, as follows:Characteristics:1. Automatically calculates the height, width, and spacing of each entry according to the data source, automatically calculating the value of the degree.2. When the number of entries, you can swipe left and right to see the whole content, graphics, text synchronization sliding, and let go after the gradual stop (rather than immediately stop).Code:(1) Core code: Barchartview.ja

Android.view.View; public class Panelrosechart extends view{private int scrwidth,scrheight; Demo using the percent example, in actual use, that is, the external incoming proportional parameter private final float arrper[] = new FLOAT[]{40F,50F,60F,35F,70F,80F,90F}; Demo with label private Final String arrperlabel[] = new string[]{"PostgreSQL", "Sybase", "DB2", "domestic and other", "MySQL", "Ms Sql", "Oracle "}; RGB color Array Private final

1, the main method of drawing picturesBitmap: Picture object, left: offset to position, top: offset at topDrawbitmap (Bitmap Bitmap, float left, float top, paint paint)2, to the picture splicing and limits the display areaDrawbitmap (Bitmap Bitmap, Rect src, RECTF DST, paint paint);Rect src: The image is cropped, and if NULL, the entire picture is displayedRECTF DST: Is the area that the picture displays in the canvas

Android manually recycles bitmapisRecycled (), causing Canvas: trying to use a recycled bitmap Processing, bitmap. isrecycled By displaying byte data transmitted from the network through Imageview, the memory size increases continuously, leading to memory overflow. Therefore, manually recycle the Bitmap data and find that the main ex (Canvas: trying to use a r

Introduction to the drawArc method in the Canvas of Android Public void drawArc (RectF oval, float startAngle, float sweepAngle, boolean useCenter, Paint) Oval: Specifies the rectangular area of the outer contour of the arc. StartAngle: the starting angle of the arc, measured in degrees. SweepAngle: the angle from which the arc is scanned. It is clockwise and measured in degrees. It starts from the

: Draws the source image where the source and destination images intersect, and draws the target image where it does not intersectAndroid.graphics.PorterDuff.Mode. XOR: Draw them anywhere outside of the source image and target image, and do not draw any content where they do not overlapAndroid.graphics.PorterDuff.Mode. lighten: Obtains the brightest pixel in two images in each position and displaysAndroid.graphics.PorterDuff.Mode. Darken: Obtains the darkest pixel of two images in each position

-BOTTOM/2);//The y-axis formula for the midpoint of the baseline canvas.drawtext ("Hello World", Rect.centerx (), baseliney,textpaint);Here's a bit of attention. Textpaint.getfontmetrics () This method must be set in the font size or style, and so on a series of methods that affect the font after the call, otherwise get the top and bottom value is not allowed.Effects such as the followingJust in the middle, proving that the equation is not a problem, and then analyzing how the equation is