You can have a complete image colored the actual way and when you fill a certain region with a color, it will replace all the regions that is specified by that color to be filled in. Layman’s terms: User will click on the hand of the OUTLINE That click location will be checked with another … Read more
This will do the trick: CGContextSetBlendMode(context, kCGBlendModeClear)
The simplest way to draw a line onto an image is to use PLOT. %# read and display image img = imread(‘autumn.tif’); figure,imshow(img) %# make sure the image doesn’t disappear if we plot something else hold on %# define points (in matrix coordinates) p1 = [10,100]; p2 = [100,20]; %# plot the points. %# Note … Read more
To a first approximation – which is probably good enough for plotting blocks close enough – the spiral is a circle and increment the angle by the ratio chord / radius. // value of theta corresponding to end of last coil final double thetaMax = coils * 2 * Math.PI; // How far to step … Read more
I had the same challenge and came to the conclusion that overwriting onDraw will at least in the general case not work. My blog explains the reasons. What worked very well for me is the following: Create a new image bitmap and attach a brand new canvas to it. Draw the image bitmap into the … Read more
How about using “Path myPath = new Path();” where you would give the x and y positions to create a triangle using lines and filling it. You can read about it, here is an example I took from somewhere. // create and draw triangles // use a Path object to store the 3 line segments … Read more
Normally you will do: def draw(): # fill screen with solid color. # draw, and flip/update screen. But, you can update just dirty portions of the screen. See pygame.display.update(): pygame.display.update() Update portions of the screen for software displays update(rectangle=None) -> None update(rectangle_list) -> None This function is like an optimized version of pygame.display.flip() for software … Read more
Don’t use getGraphics(). Any painting you do will be temporary and will be lost the next time Swing determines a component needs to be repainted. Instead override the paintComponent() method of a JComponent or JPanel to do your custom painting. See Custom Painting for more details and examples.
You can do this: Paint paint = new Paint(); final RectF rect = new RectF(); //Example values rect.set(mWidth/2- mRadius, mHeight/2 – mRadius, mWidth/2 + mRadius, mHeight/2 + mRadius); paint.setColor(Color.GREEN); paint.setStrokeWidth(20); paint.setAntiAlias(true); paint.setStrokeCap(Paint.Cap.ROUND); paint.setStyle(Paint.Style.STROKE); canvas.drawArc(rect, -90, 360, false, paint); The key is in paint.setStyle(Paint.Style.STROKE);, it crops the arc’s center with the stroke that you define in … Read more
Use a path. It has the advantage of working for APIs less than 21 (Arc is also limited thusly, which is why I quad). Which is a problem because not everybody has Lollipop yet. You can however specify a RectF and set the values with that and use arc back to API 1, but then … Read more