Preconcat the current matrix with the specified scale. ... android canvas android-canvas android-bitmap  Share. 215 2 2 silver badges 9 9 bronze badges. You can disable pre-scaling dimensions and images by setting android:anyDensity to "false" in the manifest or programmatically for a Bitmap by setting inScaled to "false". A scaling transformation modifies this behavior. Scaling (as you might’ve guessed by the name) defines the size of the image. Auto-scaling of pixel dimensions and coordinates. The CanvasRenderingContext2D.scale() method of the Canvas 2D API adds a scaling transformation to the canvas units horizontally and/or vertically. If you are targeting Android 3.0 or higher, you can use the built-in drag-and-drop event listeners with View.OnDragListener, as described in Drag and Drop. You can define two values — one for the x-axis and the other for the y-axis. Preconcat the current matrix with the specified scale. i built an android demo app so i could test my understanding of displaying bitmaps on a canvas. I am taking an image and drawing it to the screen using canvas. Android Canvas 缩放（Scale） zhenj1ang_77: 使用这个Canvas.scale (float sx, float sy, float px, float py) 方法后,触摸点会不正确,怎么计算出正确的触摸点? This works because each time onDraw is called, the canvas is cleared … Draw directly on Canvas. When I scale the canvas in unity editor game tab or in real device ios works perfectly. In this case, the system auto-scales any absolute pixel coordinates and pixel dimension values at draw time. As you c a n see, anti-alias produces a smooth edge. Canvas is a class in Android that performs 2D drawing of different objects onto the screen. By default, one unit on the canvas is exactly one pixel. This lesson describes how to use touch gestures to drag and scale on-screen objects, using onTouchEvent() to intercept touch events. Android Canvas 缩放（Scale） 又是美好一天 回复 WhiteYin: 感谢纠正！ Follow asked Jul 25 '16 at 17:22. jagrakye jagrakye. Here is the original source code for the examples used in this lesson.. Drag an Object. Kotlin private const val TOUCH_SCALE_FACTOR: Float = 180.0f / 320f ... private var previousX: Float = 0f private var previousY: Float = 0f override fun onTouchEvent(e: MotionEvent): Boolean { // MotionEvent reports input details from the touch screen // and other input controls. I have a canvas with canvas scaler and image with anchor as in image. Improve this question. For instance, a scaling factor of 0.5 results in a unit size of 0.5 pixels; shapes are thus drawn at half the normal size. I want to scale it based on the screen size. The saying “a blank canvas” is very similar to what a Canvas object is on Android.
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