// Use double buffer to reduce flicker when drawing complex ROIs. // Author: Erik Meijering void paintDoubleBuffered(Graphics g) { final int srcRectWidthMag = (int) (srcRect.width * magnification); final int srcRectHeightMag = (int) (srcRect.height * magnification); if (offScreenImage == null || offScreenWidth != srcRectWidthMag || offScreenHeight != srcRectHeightMag) { offScreenImage = createImage(srcRectWidthMag, srcRectHeightMag); offScreenWidth = srcRectWidthMag; offScreenHeight = srcRectHeightMag; } Roi roi = imp.getRoi(); try { if (imageUpdated) { imageUpdated = false; imp.updateImage(); } Graphics offScreenGraphics = offScreenImage.getGraphics(); Java2.setBilinearInterpolation(offScreenGraphics, Prefs.interpolateScaledImages); Image img = imp.getImage(); if (img != null) offScreenGraphics.drawImage( img, 0, 0, srcRectWidthMag, srcRectHeightMag, srcRect.x, srcRect.y, srcRect.x + srcRect.width, srcRect.y + srcRect.height, null); if (overlay != null) drawOverlay(offScreenGraphics); if (showAllROIs) drawAllROIs(offScreenGraphics); if (roi != null) drawRoi(roi, offScreenGraphics); if (srcRect.width < imageWidth || srcRect.height < imageHeight) drawZoomIndicator(offScreenGraphics); if (IJ.debugMode) showFrameRate(offScreenGraphics); g.drawImage(offScreenImage, 0, 0, null); } catch (OutOfMemoryError e) { IJ.outOfMemory("Paint"); } }
public void paint(Graphics g) { if (histogram != null) { if (os == null) { os = createImage(WIDTH, HEIGHT); osg = os.getGraphics(); osg.setColor(Color.white); osg.fillRect(0, 0, WIDTH, HEIGHT); osg.setColor(Color.gray); for (int i = 0; i < WIDTH; i++) { if (hColors != null) osg.setColor(hColors[i]); osg.drawLine(i, HEIGHT, i, HEIGHT - ((int) (HEIGHT * histogram[i]) / hmax) - 4); } osg.dispose(); } g.drawImage(os, 0, 0, this); } else { g.setColor(Color.white); g.fillRect(0, 0, WIDTH, HEIGHT); } g.setColor(Color.black); g.drawLine(0, HEIGHT - 4, 256, HEIGHT - 4); g.drawRect(0, 0, WIDTH, HEIGHT); g.drawRect((int) minHue, 1, (int) (maxHue - minHue), HEIGHT - 5); }