个图形用户界面绘画和事件处理的案例 |
| 作者：j2medev 来源：j2medev.com 发布时间：2006-7-25 8:47:10 |
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int fh; // height of the font int w, h; // width and height of the canvas int titleHeight; // Height of the title int pieSize; // Size of the Pie chart used for width and height int barSize; // Size of the Bar chart used for width and height int eventHeight; // Size of the event region int pad; // Padding used between items SampleCanvas() { w = getWidth(); h = getHeight(); font = Font.getFont(Font.FACE_SYSTEM, Font.STYLE_PLAIN, Font.SIZE_SMALL); fh = font.getHeight(); /* Compute the sizes of the bar and pie charts * It should use all the space except for the title * and event regions. * Don't let the charts get too small */ pad = 2; titleHeight = fh + pad * 2; eventHeight = fh * 3; barSize = h - (titleHeight + pad) - (eventHeight + pad); if (barSize < 20) // Don't let them get too small barSize = 20; if (barSize > (w - pad) / 2) // Shrink to 1/2 width barSize = (w - pad) / 2; pieSize = barSize; } protected void keyPressed(int key) { keyCode = key; event = "Pressed"; handleActions(key); repaint(); } protected void keyRepeated(int key) { keyCode = key; event = "Repeated"; handleActions(key); repaint(); } protected void keyReleased(int key) { keyCode = key; event = "Released"; repaint(); } protected void pointerPressed(int x, int y) { this.x = x; this.y = y; keyCode = 0; event = "Pressed"; repaint(); } protected void pointerReleased(int x, int y) { this.x = x; this.y = y; keyCode = 0; event = "Released"; repaint(); } protected void pointerDragged(int x, int y) { this.x = x; this.y = y; keyCode = 0; event = "Dragged"; } void handleActions(int keyCode) { int action = getGameAction(keyCode); switch (action) { case LEFT: x -= 1; break; case RIGHT: x += 1; break; case UP: y -= 1; break; case DOWN: y += 1; break; } } protected void paint(Graphics g) { g.setFont(font); g.setGrayScale(255); g.fillRect(0, 0, w, h); x = (x < 0) ? w - 1 : x; y = (y < 0) ? h - 1 : y; x = x % w; y = y % h; // Draw Fill and outline for background of title Text int swidth = pad * 2 + font.stringWidth("Pie and Bar Samples"); int title_x = (w - swidth)/2; g.setGrayScale(128); g.fillRoundRect(title_x, 0, swidth, fh, 5, 5); g.setGrayScale(0); g.drawRoundRect(title_x, 0, swidth, fh, 5, 5); // Sample Text g.setColor(0, 0, 0); g.drawString("Pie and Bar Samples", title_x + pad, pad, Graphics.TOP|Graphics.LEFT); // Translate to below title text g.translate(0, titleHeight + pad); /* * Draw pie chart on the left side * using the barSize for width and height */ g.setColor(255, 0, 0); g.fillArc(0, 0, pieSize, pieSize, 45, 270); g.setColor(0, 255, 0); g.fillArc(0, 0, pieSize, pieSize, 0, 45); g.setColor(0, 0, 255); g.fillArc(0, 0, pieSize, pieSize, 0, -45); g.setColor(0); g.drawArc(0, 0, pieSize, pieSize, 0, 360); // Draw Bar chart on right side of the display // scale the values to the pieSize maximum value int yorig = barSize; int h1 = barSize / 3, h2 = barSize / 2, h3 = barSize; int avg = (h1 + h2 + h3) / 3; // Move over to draw Bar chart g.translate((w + pad) / 2, 0); int bw = pieSize / 7; if (bw < 2) bw = 2; g.setColor(255, 0, 0); g.fillRect(bw*1, yorig-h1, bw+1, h1); g.setColor(0, 255, 0); g.fillRect(bw*3, yorig-h2, bw+1, h2); g.setColor(0, 0, 255); g.fillRect(bw*5, yorig-h3, bw+1, h3); g.setColor(0); g.drawRect(bw*1, yorig-h1, bw, h1); g.drawRect(bw*3, yorig-h2, bw, h2); g.drawRect(bw*5, yorig-h3, bw, h3); // Draw axis for bar chart. g.setGrayScale(0); g.drawLine(0, 0, 0, yorig); g.drawLine(0, yorig, barSize, yorig); g.setStrokeStyle(Graphics.DOTTED); g.drawLine(0, yorig - avg, barSize, yorig-avg); g.setStrokeStyle(Graphics.SOLID); // Restore to left and move down g.translate(-(w + pad) / 2, pieSize + pad); // Draw the key and pointer status g.setColor(128, 128, 128); int col1 = font.stringWidth("Action:"); g.drawString("Key: ", col1, 0, Graphics.TOP|Graphics.RIGHT); g.drawString(keyString(keyCode), col1, 0, Graphics.TOP|Graphics.LEFT); g.drawString("Action:", col1, fh, Graphics.TOP|Graphics.RIGHT); g.drawString(actionString(keyCode), col1, fh, Graphics.TOP|Graphics.LEFT); g.drawString("Event:", col1, fh*2, Graphics.TOP|Graphics.RIGHT); g.drawString(event, col1, fh*2, Graphics.TOP|Graphics.LEFT); int col2 = 80; g.drawString("x:", col2, 0, Graphics.TOP|Graphics.RIGHT); g.drawString(Integer.toString(x), col2, 0, Graphics.TOP|Graphics.LEFT); g.drawString("y:", col2, fh, Graphics.TOP|Graphics.RIGHT); g.drawString(Integer.toString(y), col2, fh, Graphics.TOP|Graphics.LEFT); // Restore the origin and draw the crosshairs on top g.translate(-g.getTranslateX(), -g.getTranslateY()); g.setColor(0, 0, 0); g.drawLine(x, y - 5, x, y + 5); g.drawLine(x - 5, y, x + 5, y); } String keyString(int keyCode) { if (keyCode == 0) { return ""; } return Integer.toString(keyCode); } String actionString(int keyCode) { if (keyCode == 0) { return ""; } int action = getGameAction(keyCode); switch (action) { case FIRE: return "Fire"; case LEFT: return "Left"; case RIGHT: return "Right"; case DOWN: return "Down"; case UP: return "Up"; case GAME_A: return "Game A"; case GAME_B: return "Game B"; case GAME_C: return "Game C"; case GAME_D: return "Game D"; case 0: return ""; default: return Integer.toString(action); } } } |
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