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HTML5 canvas drawImage with at an angle

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问题 I am experimenting with animation in <canvas> and can't work out how to draw an image at an angle. The desired effect is a few images drawn as usual, with one image rotating slowly. (This image is not at the centre of the screen, if that makes any difference). 回答1: You need to modify the transformation matrix before drawing the image that you want rotated. Assume image points to an HTMLImageElement object. var x = canvas.width / 2; var y = canvas.height / 2; var width = image.width; var

How to draw an image over another image?

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I have a Java project that's about traffic network simulation in a random city, I've managed to figure out a way to implement this project, so I divided each intersection into a section which is basically an extended JPanel class (named Carrefour)...everything works well until I got stuck with how to draw vehicles and make them pass through roads. So my problem is how to draw an image (vehicle image) over an another image (road)? If this is Swing, then draw the background image in a BufferedImage. Display this BufferedImage in a JComponent's (such as a JPanel's) paintComponent method using

How to draw an image over another image?

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问题 I have a Java project that\'s about traffic network simulation in a random city, I\'ve managed to figure out a way to implement this project, so I divided each intersection into a section which is basically an extended JPanel class (named Carrefour)...everything works well until I got stuck with how to draw vehicles and make them pass through roads. So my problem is how to draw an image (vehicle image) over an another image (road)? 回答1: If this is Swing, then draw the background image in a