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增加文字颜色与背景颜色色差设置
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Looly
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@ -83,7 +83,40 @@ public class GraphicsUtil {
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* @since 4.5.10
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*/
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public static Graphics drawStringColourful(final Graphics g, final String str, final Font font, final int width, final int height) {
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return drawString(g, str, font, null, width, height);
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return drawStringColourful(g, str, font, width, height, null, 0);
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}
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/**
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* 绘制字符串，使用随机颜色，默认抗锯齿
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*
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* @param g {@link Graphics}画笔
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* @param str 字符串
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* @param font 字体
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* @param width 字符串总宽度
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* @param height 字符串背景高度
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* @param compareColor 对比颜色，用于计算颜色与对比颜色的色差，色差小于minColorDistance则重新生成颜色
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* @param minColorDistance 随机生成的颜色与对比颜色的最小色差，小于此值则重新生成颜色
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* @return 画笔对象
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* @since 6.0.0
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*/
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public static Graphics drawStringColourful(final Graphics g, final String str, final Font font,
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final int width, final int height, final Color compareColor, final int minColorDistance) {
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// 抗锯齿
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enableAntialias(g);
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// 创建字体
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g.setFont(font);
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// 文字高度（必须在设置字体后调用）
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final int midY = getCenterY(g, height);
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final int len = str.length();
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final int charWidth = width / len;
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for (int i = 0; i < len; i++) {
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// 产生随机的颜色值，让输出的每个字符的颜色值都将不同。
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g.setColor(ColorUtil.randomColor(compareColor, minColorDistance));
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g.drawString(String.valueOf(str.charAt(i)), i * charWidth, midY);
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}
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return g;
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}
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/**
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@ -93,12 +126,11 @@ public class GraphicsUtil {
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* @param str 字符串
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* @param font 字体
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* @param color 字体颜色，{@code null} 表示使用随机颜色（每个字符单独随机）
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* @param width 字符串背景的宽度
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* @param height 字符串背景的高度
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* @return 画笔对象
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* @since 4.5.10
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* @since 6.0.0
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*/
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public static Graphics drawString(final Graphics g, final String str, final Font font, final Color color, final int width, final int height) {
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public static Graphics drawString(final Graphics g, final String str, final Font font, final Color color, final int height) {
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// 抗锯齿
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enableAntialias(g);
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// 创建字体
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@ -109,16 +141,7 @@ public class GraphicsUtil {
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if (null != color) {
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g.setColor(color);
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}
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final int len = str.length();
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final int charWidth = width / len;
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for (int i = 0; i < len; i++) {
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if (null == color) {
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// 产生随机的颜色值，让输出的每个字符的颜色值都将不同。
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g.setColor(ColorUtil.randomColor());
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}
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g.drawString(String.valueOf(str.charAt(i)), i * charWidth, midY);
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}
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g.drawString(str, 0, midY);
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return g;
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}
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@ -222,9 +245,9 @@ public class GraphicsUtil {
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private static void enableAntialias(final Graphics g) {
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if (g instanceof Graphics2D) {
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((Graphics2D) g).setRenderingHints(
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RenderingHintsBuilder.of()
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.setAntialiasing(RenderingHintsBuilder.Antialias.ON)
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.setTextAntialias(RenderingHintsBuilder.TextAntialias.ON).build()
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RenderingHintsBuilder.of()
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.setAntialiasing(RenderingHintsBuilder.Antialias.ON)
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.setTextAntialias(RenderingHintsBuilder.TextAntialias.ON).build()
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);
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}
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}
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@ -40,28 +40,28 @@ public class ColorUtil {
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static {
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final Map<String, Color> colorMap = MapUtil
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.builder("BLACK", Color.BLACK)
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.put("WHITE", Color.WHITE)
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.put("LIGHTGRAY", Color.LIGHT_GRAY)
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.put("LIGHT_GRAY", Color.LIGHT_GRAY)
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.put("GRAY", Color.GRAY)
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.put("DARKGRAY", Color.DARK_GRAY)
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.put("DARK_GRAY", Color.DARK_GRAY)
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.put("RED", Color.RED)
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.put("PINK", Color.PINK)
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.put("ORANGE", Color.ORANGE)
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.put("YELLOW", Color.YELLOW)
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.put("GREEN", Color.GREEN)
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.put("MAGENTA", Color.MAGENTA)
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.put("CYAN", Color.CYAN)
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.put("BLUE", Color.BLUE)
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// 暗金色
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.put("DARKGOLD", hexToColor("#9e7e67"))
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.put("DARK_GOLD", hexToColor("#9e7e67"))
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// 亮金色
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.put("LIGHTGOLD", hexToColor("#ac9c85"))
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.put("LIGHT_GOLD", hexToColor("#ac9c85"))
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.build();
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.builder("BLACK", Color.BLACK)
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.put("WHITE", Color.WHITE)
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.put("LIGHTGRAY", Color.LIGHT_GRAY)
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.put("LIGHT_GRAY", Color.LIGHT_GRAY)
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.put("GRAY", Color.GRAY)
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.put("DARKGRAY", Color.DARK_GRAY)
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.put("DARK_GRAY", Color.DARK_GRAY)
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.put("RED", Color.RED)
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.put("PINK", Color.PINK)
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.put("ORANGE", Color.ORANGE)
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.put("YELLOW", Color.YELLOW)
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.put("GREEN", Color.GREEN)
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.put("MAGENTA", Color.MAGENTA)
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.put("CYAN", Color.CYAN)
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.put("BLUE", Color.BLUE)
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// 暗金色
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.put("DARKGOLD", hexToColor("#9e7e67"))
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.put("DARK_GOLD", hexToColor("#9e7e67"))
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// 亮金色
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.put("LIGHTGOLD", hexToColor("#ac9c85"))
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.put("LIGHT_GOLD", hexToColor("#ac9c85"))
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.build();
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COLOR_MAPPING = MapUtil.view(colorMap);
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}
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@ -78,11 +78,11 @@ public class ColorUtil {
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*/
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public static String toCssRgb(final Color color) {
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return StrUtil.builder()
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.append("rgb(")
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.append(color.getRed()).append(",")
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.append(color.getGreen()).append(",")
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.append(color.getBlue()).append(")")
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.toString();
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.append("rgb(")
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.append(color.getRed()).append(",")
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.append(color.getGreen()).append(",")
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.append(color.getBlue()).append(")")
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.toString();
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}
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/**
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@ -93,12 +93,12 @@ public class ColorUtil {
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*/
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public static String toCssRgba(final Color color) {
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return StrUtil.builder()
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.append("rgba(")
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.append(color.getRed()).append(",")
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.append(color.getGreen()).append(",")
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.append(color.getBlue()).append(",")
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.append(color.getAlpha() / 255D).append(")")
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.toString();
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.append("rgba(")
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.append(color.getRed()).append(",")
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.append(color.getGreen()).append(",")
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.append(color.getBlue()).append(",")
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.append(color.getAlpha() / 255D).append(")")
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.toString();
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}
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/**
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@ -233,6 +233,8 @@ public class ColorUtil {
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return new Color(r, g, b);
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}
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// region randomColor
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/**
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* 生成随机颜色
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*
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@ -257,6 +259,42 @@ public class ColorUtil {
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return new Color(random.nextInt(RGB_COLOR_BOUND), random.nextInt(RGB_COLOR_BOUND), random.nextInt(RGB_COLOR_BOUND));
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}
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/**
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* 生成随机颜色，与指定颜色有一定的区分度
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*
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* @param compareColor 比较颜色，{@code null}表示无区分要求
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* @param minDistance 最小色差，按三维坐标计算的距离值。小于等于0表示无区分要求
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* @return 随机颜色
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* @since 5.8.30
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*/
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public static Color randomColor(final Color compareColor, final int minDistance) {
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Color color = randomColor();
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if(null == compareColor || minDistance <= 0){
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while (computeColorDistance(compareColor, color) < minDistance) {
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color = randomColor();
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}
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}
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return color;
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}
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// endregion
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/**
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* 计算两个颜色之间的色差，按三维坐标距离计算
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*
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* @param color1 颜色1
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* @param color2 颜色2
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* @return 色差，按三维坐标距离值
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* @since 5.8.30
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*/
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public static int computeColorDistance(final Color color1, final Color color2) {
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if (null == color1 || null == color2) {
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return 0;
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}
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return (int) Math.sqrt(Math.pow(color1.getRed() - color2.getRed(), 2)
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+ Math.pow(color1.getGreen() - color2.getGreen(), 2)
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+ Math.pow(color1.getBlue() - color2.getBlue(), 2));
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}
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/**
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* AWT的{@link Color}颜色转换为ANSI颜色，由于取最接近颜色，故可能有色差
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*
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@ -12,9 +12,20 @@
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package org.dromara.hutool.swing.captcha;
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import org.dromara.hutool.core.util.ObjUtil;
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import org.dromara.hutool.core.util.RandomUtil;
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import org.dromara.hutool.swing.img.GraphicsUtil;
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import org.dromara.hutool.swing.img.color.ColorUtil;
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import org.junit.jupiter.api.Disabled;
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import org.junit.jupiter.api.Test;
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import java.awt.Color;
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import java.awt.Graphics;
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import java.awt.Graphics2D;
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import java.awt.Image;
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import java.awt.image.BufferedImage;
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import java.util.concurrent.ThreadLocalRandom;
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public class CaptchaUtilTest {
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@Test
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@ -24,4 +35,70 @@ public class CaptchaUtilTest {
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CaptchaUtil.ofShearCaptcha(320, 240);
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}
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}
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@Test
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@Disabled
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public void drawStringColourfulTest() {
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for(int i = 0; i < 10; i++) {
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final AbstractCaptcha lineCaptcha = new TestLineCaptcha(200, 100, 5, 10);
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lineCaptcha.write("d:/captcha/line"+i+".png");
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}
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}
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static class TestLineCaptcha extends AbstractCaptcha{
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private static final long serialVersionUID = -558846929114465692L;
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public TestLineCaptcha(final int width, final int height, final int codeCount, final int interfereCount) {
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super(width, height, codeCount, interfereCount);
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}
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@Override
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protected Image createImage(final String code) {
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// 图像buffer
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final BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
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final Graphics2D g = GraphicsUtil.createGraphics(image, ObjUtil.defaultIfNull(this.background, Color.WHITE));
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// 干扰线
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drawInterfere(g);
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// 字符串
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drawString(g, code);
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return image;
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}
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// ----------------------------------------------------------------------------------------------------- Private method start
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/**
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* 绘制字符串
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*
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* @param g {@link Graphics}画笔
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* @param code 验证码
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*/
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private void drawString(final Graphics2D g, final String code) {
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// 指定透明度
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if (null != this.textAlpha) {
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g.setComposite(this.textAlpha);
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}
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GraphicsUtil.drawStringColourful(g, code, this.font, this.width, this.height,Color.WHITE,200);
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}
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/**
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* 绘制干扰线
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*
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* @param g {@link Graphics2D}画笔
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*/
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private void drawInterfere(final Graphics2D g) {
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final ThreadLocalRandom random = RandomUtil.getRandom();
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// 干扰线
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for (int i = 0; i < this.interfereCount; i++) {
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final int xs = random.nextInt(width);
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final int ys = random.nextInt(height);
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final int xe = xs + random.nextInt(width / 3);
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final int ye = ys + random.nextInt(height / 3);
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g.setColor(ColorUtil.randomColor(random));
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g.drawLine(xs, ys, xe, ye);
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}
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}
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// ----------------------------------------------------------------------------------------------------- Private method start
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}
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}
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