init

src/Obj/Materail/FlowDashedLineFlowMaterialProperty.js

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+/*
+ * @Description: 流动线
+ */
+function FlowDashedLine() {
+  class FlowDashedLineFlowMaterialProperty {
+    constructor(options) {
+      this._definitionChanged = new Cesium.Event();
+      this._color = undefined;
+      this._speed = undefined;
+      this._uType = undefined;
+      this._space = undefined;
+      this._dashSize = undefined;
+      this._scale = undefined;
+      this.color = new Cesium.Color.fromCssColorString(options.color || "rgba(255,255,255,1)");
+      this.speed = options.speed != undefined ? options.speed : 1.0;//速度
+      this.space = options.space || 0.0;//速度
+      this.dashSize = options.dashSize || 0.03;//速度
+      this.uType = options.uType === undefined ? 1 : options.uType;//类型：0：普通流动线 1：虚化虚线
+      this.lineBackAlpha = options.lineBackAlpha || 0.05;
+      this.scale = options.scale || 1.0;
+    }
+
+    get isConstant() {
+      return false;
+    }
+
+    get definitionChanged() {
+      return this._definitionChanged;
+    }
+
+    getType(time) {
+      return Cesium.Material.FlowDashedLineMaterialType;
+    }
+
+    getValue(time, result) {
+      if (!Cesium.defined(result)) {
+        result = {};
+      }
+
+      result.color = Cesium.Property.getValueOrDefault(
+        this._color,
+        time,
+        Cesium.Color.RED,
+        result.color
+      );
+      result.speed = Cesium.Property.getValueOrDefault(
+        this._speed,
+        time,
+        10,
+        result.speed
+      );
+      result.space = Cesium.Property.getValueOrDefault(
+        this._space,
+        time,
+        10,
+        result.space
+      );
+      result.dashSize = Cesium.Property.getValueOrDefault(
+        this._dashSize,
+        time,
+        10,
+        result.dashSize
+      );
+      result.uType = Cesium.Property.getValueOrDefault(
+        this._uType,
+        time,
+        1,
+        result.uType
+      );
+      result.scale = Cesium.Property.getValueOrDefault(
+        this._scale,
+        time,
+        1.0,
+        result.scale
+      );
+      result.lineBackAlpha = this.lineBackAlpha;
+      result.frameNumber = Cesium.getTimestamp();
+      return result;
+    }
+
+    equals(other) {
+      return (
+        this === other ||
+        (other instanceof FlowDashedLineFlowMaterialProperty &&
+          Cesium.Property.equals(this._color, other._color) &&
+          Cesium.Property.equals(this._speed, other.speed) &&
+          Cesium.Property.equals(this._uType, other.uType) &&
+          Cesium.Property.equals(this._lineBackAlpha, other.lineBackAlpha) &&
+          Cesium.Property.equals(this._scale, other.scale))
+      );
+    }
+  }
+
+  Object.defineProperties(FlowDashedLineFlowMaterialProperty.prototype, {
+    color: Cesium.createPropertyDescriptor("color"),
+    speed: Cesium.createPropertyDescriptor("speed"),
+    space: Cesium.createPropertyDescriptor("space"),
+    dashSize: Cesium.createPropertyDescriptor("dashSize"),
+    uType: Cesium.createPropertyDescriptor("uType"),
+    transparency: Cesium.createPropertyDescriptor("lineBackAlpha"),
+    scale: Cesium.createPropertyDescriptor("scale"),
+  });
+
+  Cesium.FlowDashedLineFlowMaterialProperty = FlowDashedLineFlowMaterialProperty;
+  Cesium.Material.FlowDashedLineFlowMaterialProperty = "FlowDashedLineFlowMaterialProperty";
+  Cesium.Material.FlowDashedLineMaterialType = "FlowDashedLineMaterialType";
+  Cesium.Material.FlowDashedLineMaterialSource = `
+      uniform vec4 color;
+      uniform float speed;
+      // uniform int uType;
+      uniform float lineBackAlpha;
+
+      czm_material czm_getMaterial(czm_materialInput materialInput)
+        {
+            czm_material material = czm_getDefaultMaterial(materialInput);
+            vec2 st = materialInput.st;
+
+            float dashSize = 0.1;
+            float gapSize = space;
+            // speed现在表示完成一次完整动画循环的秒数
+            float progress = speed==0.0 ? 0.0 : fract(frameNumber / 1000.0 / speed * scale);
+            float pattern = fract(st.x / dashSize * (1.0 + gapSize) + progress / dashSize * (1.0 + gapSize));
+            float dash1 = step(0.0, pattern) - step(1.0/(1.0 + gapSize), pattern);
+            float dash2 = smoothstep(0.0, 0.2, pattern) -
+                smoothstep(1.0/(1.0 + gapSize),
+                        1.0/(1.0 + gapSize) + 0.2,
+                        pattern);
+            float dash = (float(uType) != 1.0)?dash1:dash2;
+            material.alpha = dash;
+            material.diffuse = color.rgb;
+            return material;
+        }
+       `;
+
+  Cesium.Material._materialCache.addMaterial(
+    Cesium.Material.FlowDashedLineMaterialType,
+    {
+      fabric: {
+        type: Cesium.Material.FlowDashedLineMaterialType,
+        uniforms: {
+          color: new Cesium.Color(1.0, 1.0, 1.0, 1.0),
+          speed: 1,
+          space: 0.0,
+          scale: 1.0,
+          dashSize: 0.03,
+          frameNumber: Cesium.getTimestamp(),
+          uType: 1,
+          lineBackAlpha: 0.05,
+        },
+        source: Cesium.Material.FlowDashedLineMaterialSource,
+      },
+      translucent: function (material) {
+        return true;
+      },
+    }
+  );
+}
+
+export { FlowDashedLine }